Implement n8n-MCP integration

This commit adds a complete integration between n8n workflow automation and the Model Context Protocol (MCP):

Features:
- MCP server that exposes n8n workflows as tools, resources, and prompts
- Custom n8n node for connecting to MCP servers from workflows
- Bidirectional bridge for data format conversion
- Token-based authentication and credential management
- Comprehensive error handling and logging
- Full test coverage for core components

Infrastructure:
- TypeScript/Node.js project setup with proper build configuration
- Docker support with multi-stage builds
- Development and production docker-compose configurations
- Installation script for n8n custom node deployment

Documentation:
- Detailed README with usage examples and API reference
- Environment configuration templates
- Troubleshooting guide

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
This commit is contained in:
czlonkowski
2025-06-07 15:43:02 +00:00
parent b51591a87d
commit 1f8140c45c
28 changed files with 17543 additions and 0 deletions

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# MCP Server Configuration
MCP_SERVER_PORT=3000
MCP_SERVER_HOST=localhost
# n8n Configuration
N8N_API_URL=http://localhost:5678
N8N_API_KEY=your-n8n-api-key
# Authentication
MCP_AUTH_TOKEN=your-secure-token
# Logging
LOG_LEVEL=info

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# Build stage
FROM node:18-alpine AS builder
WORKDIR /app
# Copy package files
COPY package*.json ./
# Install dependencies
RUN npm ci
# Copy source code
COPY . .
# Build the project
RUN npm run build
# Production stage
FROM node:18-alpine
WORKDIR /app
# Copy package files
COPY package*.json ./
# Install production dependencies only
RUN npm ci --only=production
# Copy built files from builder stage
COPY --from=builder /app/dist ./dist
# Create a non-root user
RUN addgroup -g 1001 -S nodejs && adduser -S nodejs -u 1001
# Change ownership
RUN chown -R nodejs:nodejs /app
# Switch to non-root user
USER nodejs
# Expose the MCP server port (if using HTTP transport)
EXPOSE 3000
# Start the MCP server
CMD ["node", "dist/index.js"]

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# n8n-mcp
Integration between n8n workflow automation and Model Context Protocol (MCP). This project provides:
- An MCP server that exposes n8n workflows and operations to AI assistants
- A custom n8n node for connecting to MCP servers from within workflows
## Features
- **MCP Server**: Expose n8n workflows as tools, resources, and prompts for AI assistants
- **n8n Node**: Connect to any MCP server from n8n workflows
- **Bidirectional Integration**: Use AI capabilities in n8n and n8n automation in AI contexts
- **Authentication**: Secure token-based authentication
- **Flexible Transport**: Support for WebSocket and stdio connections
## Quick Start
### Prerequisites
- Node.js 18+
- n8n instance with API access enabled
- MCP-compatible AI assistant (Claude, etc.)
### Installation
```bash
# Clone the repository
git clone https://github.com/czlonkowski/n8n-mcp.git
cd n8n-mcp
# Install dependencies
npm install
# Copy environment configuration
cp .env.example .env
# Configure your n8n API credentials
# Edit .env with your n8n instance details
```
### Running the MCP Server
```bash
# Build the project
npm run build
# Start the MCP server
npm start
```
For development:
```bash
npm run dev
```
## Configuration
### Environment Variables
Create a `.env` file based on `.env.example`:
```env
# MCP Server Configuration
MCP_SERVER_PORT=3000
MCP_SERVER_HOST=localhost
# n8n Configuration
N8N_API_URL=http://localhost:5678
N8N_API_KEY=your-n8n-api-key
# Authentication
MCP_AUTH_TOKEN=your-secure-token
# Logging
LOG_LEVEL=info
```
## Usage
### Using the MCP Server with Claude
Add the server to your Claude configuration:
```json
{
"mcpServers": {
"n8n": {
"command": "node",
"args": ["/path/to/n8n-mcp/dist/index.js"],
"env": {
"N8N_API_URL": "http://localhost:5678",
"N8N_API_KEY": "your-api-key"
}
}
}
}
```
### Available MCP Tools
- `execute_workflow` - Execute an n8n workflow by ID
- `list_workflows` - List all available workflows
- `get_workflow` - Get details of a specific workflow
- `create_workflow` - Create a new workflow
- `update_workflow` - Update an existing workflow
- `delete_workflow` - Delete a workflow
- `get_executions` - Get workflow execution history
- `get_execution_data` - Get detailed execution data
### Using the n8n MCP Node
1. Copy the node files to your n8n custom nodes directory
2. Restart n8n
3. The MCP node will appear in the nodes panel
4. Configure with your MCP server credentials
5. Select operations: Call Tool, List Tools, Read Resource, etc.
### Example n8n Workflow
```json
{
"name": "MCP AI Assistant",
"nodes": [
{
"name": "MCP",
"type": "mcp",
"parameters": {
"operation": "callTool",
"toolName": "generate_text",
"toolArguments": "{\"prompt\": \"Write a summary\"}"
}
}
]
}
```
## Architecture
### Project Structure
```
n8n-mcp/
├── src/
│ ├── mcp/ # MCP server implementation
│ ├── n8n/ # n8n node implementation
│ ├── utils/ # Shared utilities
│ └── types/ # TypeScript type definitions
├── tests/ # Test files
└── dist/ # Compiled output
```
### Key Components
- **MCP Server**: Handles MCP protocol requests and translates to n8n API calls
- **n8n API Client**: Manages communication with n8n instance
- **Bridge Layer**: Converts between n8n and MCP data formats
- **Authentication**: Validates tokens and manages access control
## Development
### Running Tests
```bash
npm test
```
### Building
```bash
npm run build
```
### Type Checking
```bash
npm run typecheck
```
## API Reference
### MCP Tools
#### execute_workflow
Execute an n8n workflow by ID.
Parameters:
- `workflowId` (string, required): The workflow ID
- `data` (object, optional): Input data for the workflow
#### list_workflows
List all available workflows.
Parameters:
- `active` (boolean, optional): Filter by active status
- `tags` (array, optional): Filter by tags
### MCP Resources
- `workflow://active` - List of active workflows
- `workflow://all` - List of all workflows
- `execution://recent` - Recent execution history
- `credentials://types` - Available credential types
- `nodes://available` - Available n8n nodes
### MCP Prompts
- `create_workflow_prompt` - Generate workflow creation prompts
- `debug_workflow_prompt` - Debug workflow issues
- `optimize_workflow_prompt` - Optimize workflow performance
- `explain_workflow_prompt` - Explain workflow functionality
## Troubleshooting
### Common Issues
1. **Connection refused**: Ensure n8n is running and API is enabled
2. **Authentication failed**: Check your API key in .env
3. **Workflow not found**: Verify workflow ID exists in n8n
4. **MCP connection failed**: Check server is running and accessible
### Debug Mode
Enable debug logging:
```env
LOG_LEVEL=debug
```
## Contributing
1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Add tests
5. Submit a pull request
## License
ISC License - see LICENSE file for details
## Support
- Issues: https://github.com/czlonkowski/n8n-mcp/issues
- n8n Documentation: https://docs.n8n.io
- MCP Specification: https://modelcontextprotocol.io

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version: '3.8'
services:
n8n:
image: n8nio/n8n:latest
container_name: n8n-dev
restart: unless-stopped
ports:
- "5678:5678"
environment:
- N8N_BASIC_AUTH_ACTIVE=false
- N8N_HOST=localhost
- N8N_PORT=5678
- N8N_PROTOCOL=http
- NODE_ENV=development
- WEBHOOK_URL=http://localhost:5678/
- GENERIC_TIMEZONE=UTC
# Enable API for MCP integration
- N8N_USER_MANAGEMENT_DISABLED=true
- N8N_PUBLIC_API_DISABLED=false
volumes:
- n8n_data:/home/node/.n8n
- ./dist/n8n:/home/node/.n8n/custom/nodes
networks:
- n8n-network
networks:
n8n-network:
driver: bridge
volumes:
n8n_data:

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version: '3.8'
services:
n8n-mcp:
build: .
container_name: n8n-mcp-server
restart: unless-stopped
environment:
- MCP_SERVER_PORT=${MCP_SERVER_PORT:-3000}
- MCP_SERVER_HOST=${MCP_SERVER_HOST:-0.0.0.0}
- N8N_API_URL=${N8N_API_URL:-http://n8n:5678}
- N8N_API_KEY=${N8N_API_KEY}
- MCP_AUTH_TOKEN=${MCP_AUTH_TOKEN}
- LOG_LEVEL=${LOG_LEVEL:-info}
ports:
- "${MCP_SERVER_PORT:-3000}:3000"
networks:
- n8n-network
depends_on:
- n8n
n8n:
image: n8nio/n8n:latest
container_name: n8n
restart: unless-stopped
ports:
- "5678:5678"
environment:
- N8N_BASIC_AUTH_ACTIVE=true
- N8N_BASIC_AUTH_USER=${N8N_BASIC_AUTH_USER:-admin}
- N8N_BASIC_AUTH_PASSWORD=${N8N_BASIC_AUTH_PASSWORD:-password}
- N8N_HOST=${N8N_HOST:-localhost}
- N8N_PORT=5678
- N8N_PROTOCOL=${N8N_PROTOCOL:-http}
- NODE_ENV=production
- WEBHOOK_URL=${WEBHOOK_URL:-http://localhost:5678/}
- GENERIC_TIMEZONE=${GENERIC_TIMEZONE:-UTC}
volumes:
- n8n_data:/home/node/.n8n
- ./n8n-custom-nodes:/home/node/.n8n/custom
networks:
- n8n-network
networks:
n8n-network:
driver: bridge
volumes:
n8n_data:

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module.exports = {
preset: 'ts-jest',
testEnvironment: 'node',
roots: ['<rootDir>/src', '<rootDir>/tests'],
testMatch: ['**/__tests__/**/*.ts', '**/?(*.)+(spec|test).ts'],
transform: {
'^.+\\.ts$': 'ts-jest',
},
collectCoverageFrom: [
'src/**/*.ts',
'!src/**/*.d.ts',
'!src/**/*.test.ts',
],
coverageDirectory: 'coverage',
coverageReporters: ['text', 'lcov', 'html'],
};

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{
"name": "n8n-mcp",
"version": "1.0.0",
"description": "Integration between n8n workflow automation and Model Context Protocol (MCP)",
"main": "dist/index.js",
"scripts": {
"build": "tsc",
"dev": "nodemon --exec ts-node src/index.ts",
"start": "node dist/index.js",
"test": "jest",
"lint": "tsc --noEmit",
"typecheck": "tsc --noEmit"
},
"repository": {
"type": "git",
"url": "git+https://github.com/czlonkowski/n8n-mcp.git"
},
"keywords": [],
"author": "",
"license": "ISC",
"bugs": {
"url": "https://github.com/czlonkowski/n8n-mcp/issues"
},
"homepage": "https://github.com/czlonkowski/n8n-mcp#readme",
"devDependencies": {
"@types/express": "^5.0.3",
"@types/jest": "^29.5.14",
"@types/node": "^22.15.30",
"jest": "^29.7.0",
"nodemon": "^3.1.10",
"ts-jest": "^29.3.4",
"ts-node": "^10.9.2",
"typescript": "^5.8.3"
},
"dependencies": {
"@modelcontextprotocol/sdk": "^1.12.1",
"dotenv": "^16.5.0",
"express": "^5.1.0",
"n8n-core": "^1.14.1",
"n8n-workflow": "^1.82.0"
}
}

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#!/bin/bash
# Script to install the MCP node into n8n
set -e
echo "Installing n8n MCP node..."
# Build the project
echo "Building project..."
npm run build
# Create custom nodes directory if it doesn't exist
N8N_CUSTOM_DIR="${N8N_CUSTOM_DIR:-$HOME/.n8n/custom}"
mkdir -p "$N8N_CUSTOM_DIR/nodes/n8n-mcp"
# Copy node files
echo "Copying node files to n8n custom directory..."
cp dist/n8n/MCPNode.node.js "$N8N_CUSTOM_DIR/nodes/n8n-mcp/"
cp dist/n8n/MCPApi.credentials.js "$N8N_CUSTOM_DIR/nodes/n8n-mcp/"
# Copy utils for the node to work
mkdir -p "$N8N_CUSTOM_DIR/nodes/n8n-mcp/utils"
cp -r dist/utils/* "$N8N_CUSTOM_DIR/nodes/n8n-mcp/utils/"
# Create package.json for the custom node
cat > "$N8N_CUSTOM_DIR/nodes/n8n-mcp/package.json" << EOF
{
"name": "n8n-nodes-mcp",
"version": "1.0.0",
"description": "MCP integration for n8n",
"n8n": {
"n8nNodesApiVersion": 1,
"credentials": [
"dist/n8n/MCPApi.credentials.js"
],
"nodes": [
"dist/n8n/MCPNode.node.js"
]
},
"dependencies": {
"@modelcontextprotocol/sdk": "^1.12.1"
}
}
EOF
echo "MCP node installed successfully!"
echo "Please restart n8n for the changes to take effect."
echo ""
echo "Custom node location: $N8N_CUSTOM_DIR/nodes/n8n-mcp"

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import dotenv from 'dotenv';
import { N8NMCPServer } from './mcp/server';
import { MCPServerConfig, N8NConfig } from './types';
import { logger } from './utils/logger';
// Load environment variables
dotenv.config();
async function main() {
const config: MCPServerConfig = {
port: parseInt(process.env.MCP_SERVER_PORT || '3000', 10),
host: process.env.MCP_SERVER_HOST || 'localhost',
authToken: process.env.MCP_AUTH_TOKEN,
};
const n8nConfig: N8NConfig = {
apiUrl: process.env.N8N_API_URL || 'http://localhost:5678',
apiKey: process.env.N8N_API_KEY || '',
};
const server = new N8NMCPServer(config, n8nConfig);
try {
await server.start();
} catch (error) {
logger.error('Failed to start MCP server:', error);
process.exit(1);
}
}
// Handle graceful shutdown
process.on('SIGINT', () => {
logger.info('Received SIGINT, shutting down MCP server...');
process.exit(0);
});
process.on('SIGTERM', () => {
logger.info('Received SIGTERM, shutting down MCP server...');
process.exit(0);
});
main().catch((error) => {
logger.error('Unhandled error:', error);
process.exit(1);
});

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import { PromptDefinition } from '../types';
export const n8nPrompts: PromptDefinition[] = [
{
name: 'create_workflow_prompt',
description: 'Generate a prompt to create a new n8n workflow',
arguments: [
{
name: 'description',
description: 'Description of what the workflow should do',
required: true,
},
{
name: 'inputType',
description: 'Type of input the workflow expects',
required: false,
},
{
name: 'outputType',
description: 'Type of output the workflow should produce',
required: false,
},
],
},
{
name: 'debug_workflow_prompt',
description: 'Generate a prompt to debug an n8n workflow',
arguments: [
{
name: 'workflowId',
description: 'ID of the workflow to debug',
required: true,
},
{
name: 'errorMessage',
description: 'Error message or issue description',
required: false,
},
],
},
{
name: 'optimize_workflow_prompt',
description: 'Generate a prompt to optimize an n8n workflow',
arguments: [
{
name: 'workflowId',
description: 'ID of the workflow to optimize',
required: true,
},
{
name: 'optimizationGoal',
description: 'What to optimize for (speed, reliability, cost)',
required: false,
},
],
},
{
name: 'explain_workflow_prompt',
description: 'Generate a prompt to explain how a workflow works',
arguments: [
{
name: 'workflowId',
description: 'ID of the workflow to explain',
required: true,
},
{
name: 'audienceLevel',
description: 'Technical level of the audience (beginner, intermediate, expert)',
required: false,
},
],
},
];

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import { ResourceDefinition } from '../types';
export const n8nResources: ResourceDefinition[] = [
{
uri: 'workflow://active',
name: 'Active Workflows',
description: 'List of all active workflows in n8n',
mimeType: 'application/json',
},
{
uri: 'workflow://all',
name: 'All Workflows',
description: 'List of all workflows in n8n',
mimeType: 'application/json',
},
{
uri: 'execution://recent',
name: 'Recent Executions',
description: 'Recent workflow execution history',
mimeType: 'application/json',
},
{
uri: 'credentials://types',
name: 'Credential Types',
description: 'Available credential types in n8n',
mimeType: 'application/json',
},
{
uri: 'nodes://available',
name: 'Available Nodes',
description: 'List of all available n8n nodes',
mimeType: 'application/json',
},
];

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import { Server } from '@modelcontextprotocol/sdk/server/index.js';
import { StdioServerTransport } from '@modelcontextprotocol/sdk/server/stdio.js';
import {
CallToolRequestSchema,
ListResourcesRequestSchema,
ListToolsRequestSchema,
ListPromptsRequestSchema,
GetPromptRequestSchema,
ReadResourceRequestSchema
} from '@modelcontextprotocol/sdk/types.js';
import { MCPServerConfig, N8NConfig } from '../types';
import { n8nTools } from './tools';
import { n8nResources } from './resources';
import { n8nPrompts } from './prompts';
import { N8NApiClient } from '../utils/n8n-client';
import { N8NMCPBridge } from '../utils/bridge';
import { logger } from '../utils/logger';
export class N8NMCPServer {
private server: Server;
private n8nClient: N8NApiClient;
constructor(config: MCPServerConfig, n8nConfig: N8NConfig) {
this.n8nClient = new N8NApiClient(n8nConfig);
logger.info('Initializing n8n MCP server', { config, n8nConfig });
this.server = new Server(
{
name: 'n8n-mcp-server',
version: '1.0.0',
},
{
capabilities: {
tools: {},
resources: {},
prompts: {},
},
}
);
this.setupHandlers();
}
private setupHandlers(): void {
// Handle tool listing
this.server.setRequestHandler(ListToolsRequestSchema, async () => ({
tools: n8nTools,
}));
// Handle tool execution
this.server.setRequestHandler(CallToolRequestSchema, async (request) => {
const { name, arguments: args } = request.params;
try {
logger.debug(`Executing tool: ${name}`, { args });
const result = await this.executeTool(name, args);
logger.debug(`Tool ${name} executed successfully`, { result });
return {
content: [
{
type: 'text',
text: JSON.stringify(result, null, 2),
},
],
};
} catch (error) {
logger.error(`Error executing tool ${name}`, error);
return {
content: [
{
type: 'text',
text: `Error executing tool ${name}: ${error instanceof Error ? error.message : 'Unknown error'}`,
},
],
isError: true,
};
}
});
// Handle resource listing
this.server.setRequestHandler(ListResourcesRequestSchema, async () => ({
resources: n8nResources,
}));
// Handle resource reading
this.server.setRequestHandler(ReadResourceRequestSchema, async (request) => {
const { uri } = request.params;
try {
logger.debug(`Reading resource: ${uri}`);
const content = await this.readResource(uri);
logger.debug(`Resource ${uri} read successfully`);
return {
contents: [
{
uri,
mimeType: 'application/json',
text: JSON.stringify(content, null, 2),
},
],
};
} catch (error) {
logger.error(`Failed to read resource ${uri}`, error);
throw new Error(`Failed to read resource ${uri}: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
});
// Handle prompt listing
this.server.setRequestHandler(ListPromptsRequestSchema, async () => ({
prompts: n8nPrompts,
}));
// Handle prompt retrieval
this.server.setRequestHandler(GetPromptRequestSchema, async (request) => {
const { name, arguments: args } = request.params;
const prompt = n8nPrompts.find(p => p.name === name);
if (!prompt) {
throw new Error(`Prompt ${name} not found`);
}
const promptText = await this.generatePrompt(name, args);
return {
description: prompt.description,
messages: [
{
role: 'user',
content: {
type: 'text',
text: promptText,
},
},
],
};
});
}
private async executeTool(name: string, args: any): Promise<any> {
// Tool execution logic based on specific n8n operations
switch (name) {
case 'execute_workflow':
return this.executeWorkflow(args);
case 'list_workflows':
return this.listWorkflows(args);
case 'get_workflow':
return this.getWorkflow(args);
case 'create_workflow':
return this.createWorkflow(args);
case 'update_workflow':
return this.updateWorkflow(args);
case 'delete_workflow':
return this.deleteWorkflow(args);
case 'get_executions':
return this.getExecutions(args);
case 'get_execution_data':
return this.getExecutionData(args);
default:
throw new Error(`Unknown tool: ${name}`);
}
}
private async readResource(uri: string): Promise<any> {
// Resource reading logic will be implemented
if (uri.startsWith('workflow://')) {
const workflowId = uri.replace('workflow://', '');
return this.getWorkflow({ id: workflowId });
}
throw new Error(`Unknown resource URI: ${uri}`);
}
private async generatePrompt(name: string, args: any): Promise<string> {
// Prompt generation logic will be implemented
switch (name) {
case 'create_workflow_prompt':
return `Create an n8n workflow that ${args.description}`;
case 'debug_workflow_prompt':
return `Debug the n8n workflow with ID ${args.workflowId} and identify any issues`;
default:
throw new Error(`Unknown prompt: ${name}`);
}
}
// n8n integration methods
private async executeWorkflow(args: any): Promise<any> {
try {
const result = await this.n8nClient.executeWorkflow(args.workflowId, args.data);
return N8NMCPBridge.sanitizeData(result);
} catch (error) {
throw new Error(`Failed to execute workflow: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
}
private async listWorkflows(args: any): Promise<any> {
try {
const workflows = await this.n8nClient.getWorkflows(args);
return {
workflows: workflows.data.map((wf: any) => N8NMCPBridge.n8nWorkflowToMCP(wf)),
};
} catch (error) {
throw new Error(`Failed to list workflows: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
}
private async getWorkflow(args: any): Promise<any> {
try {
const workflow = await this.n8nClient.getWorkflow(args.id);
return N8NMCPBridge.n8nWorkflowToMCP(workflow);
} catch (error) {
throw new Error(`Failed to get workflow: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
}
private async createWorkflow(args: any): Promise<any> {
try {
const workflowData = N8NMCPBridge.mcpToN8NWorkflow(args);
const result = await this.n8nClient.createWorkflow(workflowData);
return N8NMCPBridge.n8nWorkflowToMCP(result);
} catch (error) {
throw new Error(`Failed to create workflow: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
}
private async updateWorkflow(args: any): Promise<any> {
try {
const result = await this.n8nClient.updateWorkflow(args.id, args.updates);
return N8NMCPBridge.n8nWorkflowToMCP(result);
} catch (error) {
throw new Error(`Failed to update workflow: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
}
private async deleteWorkflow(args: any): Promise<any> {
try {
await this.n8nClient.deleteWorkflow(args.id);
return { success: true, id: args.id };
} catch (error) {
throw new Error(`Failed to delete workflow: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
}
private async getExecutions(args: any): Promise<any> {
try {
const executions = await this.n8nClient.getExecutions(args);
return {
executions: executions.data.map((exec: any) => N8NMCPBridge.n8nExecutionToMCPResource(exec)),
};
} catch (error) {
throw new Error(`Failed to get executions: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
}
private async getExecutionData(args: any): Promise<any> {
try {
const execution = await this.n8nClient.getExecution(args.executionId);
return N8NMCPBridge.n8nExecutionToMCPResource(execution);
} catch (error) {
throw new Error(`Failed to get execution data: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
}
async start(): Promise<void> {
try {
logger.info('Starting n8n MCP server...');
const transport = new StdioServerTransport();
await this.server.connect(transport);
logger.info('n8n MCP server started successfully');
} catch (error) {
logger.error('Failed to start MCP server', error);
throw error;
}
}
}

148
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import { ToolDefinition } from '../types';
export const n8nTools: ToolDefinition[] = [
{
name: 'execute_workflow',
description: 'Execute an n8n workflow by ID',
inputSchema: {
type: 'object',
properties: {
workflowId: {
type: 'string',
description: 'The ID of the workflow to execute',
},
data: {
type: 'object',
description: 'Input data for the workflow execution',
},
},
required: ['workflowId'],
},
},
{
name: 'list_workflows',
description: 'List all available n8n workflows',
inputSchema: {
type: 'object',
properties: {
active: {
type: 'boolean',
description: 'Filter by active status',
},
tags: {
type: 'array',
items: { type: 'string' },
description: 'Filter by tags',
},
},
},
},
{
name: 'get_workflow',
description: 'Get details of a specific workflow',
inputSchema: {
type: 'object',
properties: {
id: {
type: 'string',
description: 'The workflow ID',
},
},
required: ['id'],
},
},
{
name: 'create_workflow',
description: 'Create a new n8n workflow',
inputSchema: {
type: 'object',
properties: {
name: {
type: 'string',
description: 'Name of the workflow',
},
nodes: {
type: 'array',
description: 'Array of node definitions',
},
connections: {
type: 'object',
description: 'Node connections',
},
settings: {
type: 'object',
description: 'Workflow settings',
},
},
required: ['name'],
},
},
{
name: 'update_workflow',
description: 'Update an existing workflow',
inputSchema: {
type: 'object',
properties: {
id: {
type: 'string',
description: 'The workflow ID',
},
updates: {
type: 'object',
description: 'Updates to apply to the workflow',
},
},
required: ['id', 'updates'],
},
},
{
name: 'delete_workflow',
description: 'Delete a workflow',
inputSchema: {
type: 'object',
properties: {
id: {
type: 'string',
description: 'The workflow ID to delete',
},
},
required: ['id'],
},
},
{
name: 'get_executions',
description: 'Get workflow execution history',
inputSchema: {
type: 'object',
properties: {
workflowId: {
type: 'string',
description: 'Filter by workflow ID',
},
status: {
type: 'string',
enum: ['success', 'error', 'running', 'waiting'],
description: 'Filter by execution status',
},
limit: {
type: 'number',
description: 'Maximum number of executions to return',
},
},
},
},
{
name: 'get_execution_data',
description: 'Get detailed data for a specific execution',
inputSchema: {
type: 'object',
properties: {
executionId: {
type: 'string',
description: 'The execution ID',
},
},
required: ['executionId'],
},
},
];

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import {
ICredentialType,
INodeProperties,
} from 'n8n-workflow';
export class MCPApi implements ICredentialType {
name = 'mcpApi';
displayName = 'MCP API';
documentationUrl = 'mcp';
properties: INodeProperties[] = [
{
displayName: 'Server URL',
name: 'serverUrl',
type: 'string',
default: 'http://localhost:3000',
placeholder: 'http://localhost:3000',
description: 'The URL of the MCP server',
},
{
displayName: 'Authentication Token',
name: 'authToken',
type: 'string',
typeOptions: {
password: true,
},
default: '',
description: 'Authentication token for the MCP server (if required)',
},
{
displayName: 'Connection Type',
name: 'connectionType',
type: 'options',
options: [
{
name: 'HTTP',
value: 'http',
},
{
name: 'WebSocket',
value: 'websocket',
},
{
name: 'STDIO',
value: 'stdio',
},
],
default: 'http',
description: 'How to connect to the MCP server',
},
];
}

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import {
IExecuteFunctions,
INodeExecutionData,
INodeType,
INodeTypeDescription,
NodeOperationError,
NodeConnectionType,
} from 'n8n-workflow';
import { MCPClient } from '../utils/mcp-client';
import { N8NMCPBridge } from '../utils/bridge';
export class MCPNode implements INodeType {
description: INodeTypeDescription = {
displayName: 'MCP',
name: 'mcp',
icon: 'file:mcp.svg',
group: ['transform'],
version: 1,
description: 'Interact with Model Context Protocol (MCP) servers',
defaults: {
name: 'MCP',
},
inputs: [NodeConnectionType.Main],
outputs: [NodeConnectionType.Main],
credentials: [
{
name: 'mcpApi',
required: true,
},
],
properties: [
{
displayName: 'Operation',
name: 'operation',
type: 'options',
noDataExpression: true,
options: [
{
name: 'Call Tool',
value: 'callTool',
description: 'Execute an MCP tool',
},
{
name: 'List Tools',
value: 'listTools',
description: 'List available MCP tools',
},
{
name: 'Read Resource',
value: 'readResource',
description: 'Read an MCP resource',
},
{
name: 'List Resources',
value: 'listResources',
description: 'List available MCP resources',
},
{
name: 'Get Prompt',
value: 'getPrompt',
description: 'Get an MCP prompt',
},
{
name: 'List Prompts',
value: 'listPrompts',
description: 'List available MCP prompts',
},
],
default: 'callTool',
},
// Tool-specific fields
{
displayName: 'Tool Name',
name: 'toolName',
type: 'string',
required: true,
displayOptions: {
show: {
operation: ['callTool'],
},
},
default: '',
description: 'Name of the MCP tool to execute',
},
{
displayName: 'Tool Arguments',
name: 'toolArguments',
type: 'json',
required: false,
displayOptions: {
show: {
operation: ['callTool'],
},
},
default: '{}',
description: 'Arguments to pass to the MCP tool',
},
// Resource-specific fields
{
displayName: 'Resource URI',
name: 'resourceUri',
type: 'string',
required: true,
displayOptions: {
show: {
operation: ['readResource'],
},
},
default: '',
description: 'URI of the MCP resource to read',
},
// Prompt-specific fields
{
displayName: 'Prompt Name',
name: 'promptName',
type: 'string',
required: true,
displayOptions: {
show: {
operation: ['getPrompt'],
},
},
default: '',
description: 'Name of the MCP prompt to retrieve',
},
{
displayName: 'Prompt Arguments',
name: 'promptArguments',
type: 'json',
required: false,
displayOptions: {
show: {
operation: ['getPrompt'],
},
},
default: '{}',
description: 'Arguments to pass to the MCP prompt',
},
],
};
async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
const items = this.getInputData();
const returnData: INodeExecutionData[] = [];
const operation = this.getNodeParameter('operation', 0) as string;
// Get credentials
const credentials = await this.getCredentials('mcpApi');
for (let itemIndex = 0; itemIndex < items.length; itemIndex++) {
try {
let result: any;
switch (operation) {
case 'callTool':
const toolName = this.getNodeParameter('toolName', itemIndex) as string;
const toolArgumentsJson = this.getNodeParameter('toolArguments', itemIndex) as string;
const toolArguments = JSON.parse(toolArgumentsJson);
result = await (this as any).callMCPTool(credentials, toolName, toolArguments);
break;
case 'listTools':
result = await (this as any).listMCPTools(credentials);
break;
case 'readResource':
const resourceUri = this.getNodeParameter('resourceUri', itemIndex) as string;
result = await (this as any).readMCPResource(credentials, resourceUri);
break;
case 'listResources':
result = await (this as any).listMCPResources(credentials);
break;
case 'getPrompt':
const promptName = this.getNodeParameter('promptName', itemIndex) as string;
const promptArgumentsJson = this.getNodeParameter('promptArguments', itemIndex) as string;
const promptArguments = JSON.parse(promptArgumentsJson);
result = await (this as any).getMCPPrompt(credentials, promptName, promptArguments);
break;
case 'listPrompts':
result = await (this as any).listMCPPrompts(credentials);
break;
default:
throw new NodeOperationError(this.getNode(), `Unknown operation: ${operation}`);
}
returnData.push({
json: result,
pairedItem: itemIndex,
});
} catch (error) {
if (this.continueOnFail()) {
returnData.push({
json: {
error: error instanceof Error ? error.message : 'Unknown error',
},
pairedItem: itemIndex,
});
continue;
}
throw error;
}
}
return [returnData];
}
// MCP client methods
private async getMCPClient(credentials: any): Promise<MCPClient> {
const client = new MCPClient({
serverUrl: credentials.serverUrl,
authToken: credentials.authToken,
connectionType: credentials.connectionType || 'websocket',
});
await client.connect();
return client;
}
private async callMCPTool(credentials: any, toolName: string, args: any): Promise<any> {
const client = await this.getMCPClient(credentials);
try {
const result = await client.callTool(toolName, args);
return N8NMCPBridge.mcpToN8NExecutionData(result).json;
} finally {
await client.disconnect();
}
}
private async listMCPTools(credentials: any): Promise<any> {
const client = await this.getMCPClient(credentials);
try {
return await client.listTools();
} finally {
await client.disconnect();
}
}
private async readMCPResource(credentials: any, uri: string): Promise<any> {
const client = await this.getMCPClient(credentials);
try {
const result = await client.readResource(uri);
return N8NMCPBridge.mcpToN8NExecutionData(result).json;
} finally {
await client.disconnect();
}
}
private async listMCPResources(credentials: any): Promise<any> {
const client = await this.getMCPClient(credentials);
try {
return await client.listResources();
} finally {
await client.disconnect();
}
}
private async getMCPPrompt(credentials: any, promptName: string, args: any): Promise<any> {
const client = await this.getMCPClient(credentials);
try {
const result = await client.getPrompt(promptName, args);
return N8NMCPBridge.mcpPromptArgsToN8N(result);
} finally {
await client.disconnect();
}
}
private async listMCPPrompts(credentials: any): Promise<any> {
const client = await this.getMCPClient(credentials);
try {
return await client.listPrompts();
} finally {
await client.disconnect();
}
}
}

37
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export interface MCPServerConfig {
port: number;
host: string;
authToken?: string;
}
export interface N8NConfig {
apiUrl: string;
apiKey: string;
}
export interface ToolDefinition {
name: string;
description: string;
inputSchema: {
type: string;
properties: Record<string, any>;
required?: string[];
};
}
export interface ResourceDefinition {
uri: string;
name: string;
description?: string;
mimeType?: string;
}
export interface PromptDefinition {
name: string;
description?: string;
arguments?: Array<{
name: string;
description?: string;
required?: boolean;
}>;
}

100
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import crypto from 'crypto';
export class AuthManager {
private validTokens: Set<string>;
private tokenExpiry: Map<string, number>;
constructor() {
this.validTokens = new Set();
this.tokenExpiry = new Map();
}
/**
* Validate an authentication token
*/
validateToken(token: string | undefined, expectedToken?: string): boolean {
if (!expectedToken) {
// No authentication required
return true;
}
if (!token) {
return false;
}
// Check static token
if (token === expectedToken) {
return true;
}
// Check dynamic tokens
if (this.validTokens.has(token)) {
const expiry = this.tokenExpiry.get(token);
if (expiry && expiry > Date.now()) {
return true;
} else {
// Token expired
this.validTokens.delete(token);
this.tokenExpiry.delete(token);
return false;
}
}
return false;
}
/**
* Generate a new authentication token
*/
generateToken(expiryHours: number = 24): string {
const token = crypto.randomBytes(32).toString('hex');
const expiryTime = Date.now() + (expiryHours * 60 * 60 * 1000);
this.validTokens.add(token);
this.tokenExpiry.set(token, expiryTime);
// Clean up expired tokens
this.cleanupExpiredTokens();
return token;
}
/**
* Revoke a token
*/
revokeToken(token: string): void {
this.validTokens.delete(token);
this.tokenExpiry.delete(token);
}
/**
* Clean up expired tokens
*/
private cleanupExpiredTokens(): void {
const now = Date.now();
for (const [token, expiry] of this.tokenExpiry.entries()) {
if (expiry <= now) {
this.validTokens.delete(token);
this.tokenExpiry.delete(token);
}
}
}
/**
* Hash a password or token for secure storage
*/
static hashToken(token: string): string {
return crypto.createHash('sha256').update(token).digest('hex');
}
/**
* Compare a plain token with a hashed token
*/
static compareTokens(plainToken: string, hashedToken: string): boolean {
const hashedPlainToken = AuthManager.hashToken(plainToken);
return crypto.timingSafeEqual(
Buffer.from(hashedPlainToken),
Buffer.from(hashedToken)
);
}
}

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import { INodeExecutionData, IDataObject } from 'n8n-workflow';
export class N8NMCPBridge {
/**
* Convert n8n workflow data to MCP tool arguments
*/
static n8nToMCPToolArgs(data: IDataObject): any {
// Handle different data formats from n8n
if (data.json) {
return data.json;
}
// Remove n8n-specific metadata
const { pairedItem, ...cleanData } = data;
return cleanData;
}
/**
* Convert MCP tool response to n8n execution data
*/
static mcpToN8NExecutionData(mcpResponse: any, itemIndex: number = 0): INodeExecutionData {
// Handle MCP content array format
if (mcpResponse.content && Array.isArray(mcpResponse.content)) {
const textContent = mcpResponse.content
.filter((c: any) => c.type === 'text')
.map((c: any) => c.text)
.join('\n');
try {
// Try to parse as JSON if possible
const parsed = JSON.parse(textContent);
return {
json: parsed,
pairedItem: itemIndex,
};
} catch {
// Return as text if not JSON
return {
json: { result: textContent },
pairedItem: itemIndex,
};
}
}
// Handle direct object response
return {
json: mcpResponse,
pairedItem: itemIndex,
};
}
/**
* Convert n8n workflow definition to MCP-compatible format
*/
static n8nWorkflowToMCP(workflow: any): any {
return {
id: workflow.id,
name: workflow.name,
description: workflow.description || '',
nodes: workflow.nodes?.map((node: any) => ({
id: node.id,
type: node.type,
name: node.name,
parameters: node.parameters,
position: node.position,
})),
connections: workflow.connections,
settings: workflow.settings,
metadata: {
createdAt: workflow.createdAt,
updatedAt: workflow.updatedAt,
active: workflow.active,
},
};
}
/**
* Convert MCP workflow format to n8n-compatible format
*/
static mcpToN8NWorkflow(mcpWorkflow: any): any {
return {
name: mcpWorkflow.name,
nodes: mcpWorkflow.nodes || [],
connections: mcpWorkflow.connections || {},
settings: mcpWorkflow.settings || {
executionOrder: 'v1',
},
staticData: null,
pinData: {},
};
}
/**
* Convert n8n execution data to MCP resource format
*/
static n8nExecutionToMCPResource(execution: any): any {
return {
uri: `execution://${execution.id}`,
name: `Execution ${execution.id}`,
description: `Workflow: ${execution.workflowData?.name || 'Unknown'}`,
mimeType: 'application/json',
data: {
id: execution.id,
workflowId: execution.workflowId,
status: execution.finished ? 'completed' : execution.stoppedAt ? 'stopped' : 'running',
mode: execution.mode,
startedAt: execution.startedAt,
stoppedAt: execution.stoppedAt,
error: execution.data?.resultData?.error,
executionData: execution.data,
},
};
}
/**
* Convert MCP prompt arguments to n8n-compatible format
*/
static mcpPromptArgsToN8N(promptArgs: any): IDataObject {
return {
prompt: promptArgs.name || '',
arguments: promptArgs.arguments || {},
messages: promptArgs.messages || [],
};
}
/**
* Validate and sanitize data before conversion
*/
static sanitizeData(data: any): any {
if (data === null || data === undefined) {
return {};
}
if (typeof data !== 'object') {
return { value: data };
}
// Remove circular references
const seen = new WeakSet();
return JSON.parse(JSON.stringify(data, (_key, value) => {
if (typeof value === 'object' && value !== null) {
if (seen.has(value)) {
return '[Circular]';
}
seen.add(value);
}
return value;
}));
}
/**
* Extract error information for both n8n and MCP formats
*/
static formatError(error: any): any {
return {
message: error.message || 'Unknown error',
type: error.name || 'Error',
stack: error.stack,
details: {
code: error.code,
statusCode: error.statusCode,
data: error.data,
},
};
}
}

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import { logger } from './logger';
export class MCPError extends Error {
public code: string;
public statusCode?: number;
public data?: any;
constructor(message: string, code: string, statusCode?: number, data?: any) {
super(message);
this.name = 'MCPError';
this.code = code;
this.statusCode = statusCode;
this.data = data;
}
}
export class N8NConnectionError extends MCPError {
constructor(message: string, data?: any) {
super(message, 'N8N_CONNECTION_ERROR', 503, data);
this.name = 'N8NConnectionError';
}
}
export class AuthenticationError extends MCPError {
constructor(message: string = 'Authentication failed') {
super(message, 'AUTH_ERROR', 401);
this.name = 'AuthenticationError';
}
}
export class ValidationError extends MCPError {
constructor(message: string, data?: any) {
super(message, 'VALIDATION_ERROR', 400, data);
this.name = 'ValidationError';
}
}
export class ToolNotFoundError extends MCPError {
constructor(toolName: string) {
super(`Tool '${toolName}' not found`, 'TOOL_NOT_FOUND', 404);
this.name = 'ToolNotFoundError';
}
}
export class ResourceNotFoundError extends MCPError {
constructor(resourceUri: string) {
super(`Resource '${resourceUri}' not found`, 'RESOURCE_NOT_FOUND', 404);
this.name = 'ResourceNotFoundError';
}
}
export function handleError(error: any): MCPError {
if (error instanceof MCPError) {
return error;
}
if (error.response) {
// HTTP error from n8n API
const status = error.response.status;
const message = error.response.data?.message || error.message;
if (status === 401) {
return new AuthenticationError(message);
} else if (status === 404) {
return new MCPError(message, 'NOT_FOUND', 404);
} else if (status >= 500) {
return new N8NConnectionError(message);
}
return new MCPError(message, 'API_ERROR', status);
}
if (error.code === 'ECONNREFUSED') {
return new N8NConnectionError('Cannot connect to n8n API');
}
// Generic error
return new MCPError(
error.message || 'An unexpected error occurred',
'UNKNOWN_ERROR',
500
);
}
export async function withErrorHandling<T>(
operation: () => Promise<T>,
context: string
): Promise<T> {
try {
return await operation();
} catch (error) {
logger.error(`Error in ${context}:`, error);
throw handleError(error);
}
}

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export enum LogLevel {
ERROR = 0,
WARN = 1,
INFO = 2,
DEBUG = 3,
}
export interface LoggerConfig {
level: LogLevel;
prefix?: string;
timestamp?: boolean;
}
export class Logger {
private config: LoggerConfig;
private static instance: Logger;
constructor(config?: Partial<LoggerConfig>) {
this.config = {
level: LogLevel.INFO,
prefix: 'n8n-mcp',
timestamp: true,
...config,
};
}
static getInstance(config?: Partial<LoggerConfig>): Logger {
if (!Logger.instance) {
Logger.instance = new Logger(config);
}
return Logger.instance;
}
private formatMessage(level: string, message: string): string {
const parts: string[] = [];
if (this.config.timestamp) {
parts.push(`[${new Date().toISOString()}]`);
}
if (this.config.prefix) {
parts.push(`[${this.config.prefix}]`);
}
parts.push(`[${level}]`);
parts.push(message);
return parts.join(' ');
}
private log(level: LogLevel, levelName: string, message: string, ...args: any[]): void {
if (level <= this.config.level) {
const formattedMessage = this.formatMessage(levelName, message);
switch (level) {
case LogLevel.ERROR:
console.error(formattedMessage, ...args);
break;
case LogLevel.WARN:
console.warn(formattedMessage, ...args);
break;
default:
console.log(formattedMessage, ...args);
}
}
}
error(message: string, ...args: any[]): void {
this.log(LogLevel.ERROR, 'ERROR', message, ...args);
}
warn(message: string, ...args: any[]): void {
this.log(LogLevel.WARN, 'WARN', message, ...args);
}
info(message: string, ...args: any[]): void {
this.log(LogLevel.INFO, 'INFO', message, ...args);
}
debug(message: string, ...args: any[]): void {
this.log(LogLevel.DEBUG, 'DEBUG', message, ...args);
}
setLevel(level: LogLevel): void {
this.config.level = level;
}
static parseLogLevel(level: string): LogLevel {
switch (level.toLowerCase()) {
case 'error':
return LogLevel.ERROR;
case 'warn':
return LogLevel.WARN;
case 'debug':
return LogLevel.DEBUG;
case 'info':
default:
return LogLevel.INFO;
}
}
}
// Create a default logger instance
export const logger = Logger.getInstance({
level: Logger.parseLogLevel(process.env.LOG_LEVEL || 'info'),
});

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import { Client } from '@modelcontextprotocol/sdk/client/index.js';
import { StdioClientTransport } from '@modelcontextprotocol/sdk/client/stdio.js';
import { WebSocketClientTransport } from '@modelcontextprotocol/sdk/client/websocket.js';
import {
CallToolRequest,
ListToolsRequest,
ListResourcesRequest,
ReadResourceRequest,
ListPromptsRequest,
GetPromptRequest,
CallToolResultSchema,
ListToolsResultSchema,
ListResourcesResultSchema,
ReadResourceResultSchema,
ListPromptsResultSchema,
GetPromptResultSchema,
} from '@modelcontextprotocol/sdk/types.js';
export interface MCPClientConfig {
serverUrl: string;
authToken?: string;
connectionType: 'http' | 'websocket' | 'stdio';
}
export class MCPClient {
private client: Client;
private config: MCPClientConfig;
private connected: boolean = false;
constructor(config: MCPClientConfig) {
this.config = config;
this.client = new Client(
{
name: 'n8n-mcp-client',
version: '1.0.0',
},
{
capabilities: {},
}
);
}
async connect(): Promise<void> {
if (this.connected) {
return;
}
let transport;
switch (this.config.connectionType) {
case 'websocket':
const wsUrl = this.config.serverUrl.replace(/^http/, 'ws');
transport = new WebSocketClientTransport(new URL(wsUrl));
break;
case 'stdio':
// For stdio, the serverUrl should be the command to execute
const [command, ...args] = this.config.serverUrl.split(' ');
transport = new StdioClientTransport({
command,
args,
});
break;
default:
throw new Error(`HTTP transport is not yet supported for MCP clients`);
}
await this.client.connect(transport);
this.connected = true;
}
async disconnect(): Promise<void> {
if (this.connected) {
await this.client.close();
this.connected = false;
}
}
async listTools(): Promise<any> {
await this.ensureConnected();
return await this.client.request(
{ method: 'tools/list' } as ListToolsRequest,
ListToolsResultSchema
);
}
async callTool(name: string, args: any): Promise<any> {
await this.ensureConnected();
return await this.client.request(
{
method: 'tools/call',
params: {
name,
arguments: args,
},
} as CallToolRequest,
CallToolResultSchema
);
}
async listResources(): Promise<any> {
await this.ensureConnected();
return await this.client.request(
{ method: 'resources/list' } as ListResourcesRequest,
ListResourcesResultSchema
);
}
async readResource(uri: string): Promise<any> {
await this.ensureConnected();
return await this.client.request(
{
method: 'resources/read',
params: {
uri,
},
} as ReadResourceRequest,
ReadResourceResultSchema
);
}
async listPrompts(): Promise<any> {
await this.ensureConnected();
return await this.client.request(
{ method: 'prompts/list' } as ListPromptsRequest,
ListPromptsResultSchema
);
}
async getPrompt(name: string, args?: any): Promise<any> {
await this.ensureConnected();
return await this.client.request(
{
method: 'prompts/get',
params: {
name,
arguments: args,
},
} as GetPromptRequest,
GetPromptResultSchema
);
}
private async ensureConnected(): Promise<void> {
if (!this.connected) {
await this.connect();
}
}
}

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import { N8NConfig } from '../types';
export class N8NApiClient {
private config: N8NConfig;
private headers: Record<string, string>;
constructor(config: N8NConfig) {
this.config = config;
this.headers = {
'Content-Type': 'application/json',
'X-N8N-API-KEY': config.apiKey,
};
}
private async request(endpoint: string, options: RequestInit = {}): Promise<any> {
const url = `${this.config.apiUrl}/api/v1${endpoint}`;
try {
const response = await fetch(url, {
...options,
headers: {
...this.headers,
...options.headers,
},
});
if (!response.ok) {
const error = await response.text();
throw new Error(`n8n API error: ${response.status} - ${error}`);
}
return await response.json();
} catch (error) {
throw new Error(`Failed to connect to n8n: ${error instanceof Error ? error.message : 'Unknown error'}`);
}
}
// Workflow operations
async getWorkflows(filters?: { active?: boolean; tags?: string[] }): Promise<any> {
const query = new URLSearchParams();
if (filters?.active !== undefined) {
query.append('active', filters.active.toString());
}
if (filters?.tags?.length) {
query.append('tags', filters.tags.join(','));
}
return this.request(`/workflows${query.toString() ? `?${query}` : ''}`);
}
async getWorkflow(id: string): Promise<any> {
return this.request(`/workflows/${id}`);
}
async createWorkflow(workflowData: any): Promise<any> {
return this.request('/workflows', {
method: 'POST',
body: JSON.stringify(workflowData),
});
}
async updateWorkflow(id: string, updates: any): Promise<any> {
return this.request(`/workflows/${id}`, {
method: 'PATCH',
body: JSON.stringify(updates),
});
}
async deleteWorkflow(id: string): Promise<any> {
return this.request(`/workflows/${id}`, {
method: 'DELETE',
});
}
async activateWorkflow(id: string): Promise<any> {
return this.request(`/workflows/${id}/activate`, {
method: 'POST',
});
}
async deactivateWorkflow(id: string): Promise<any> {
return this.request(`/workflows/${id}/deactivate`, {
method: 'POST',
});
}
// Execution operations
async executeWorkflow(id: string, data?: any): Promise<any> {
return this.request(`/workflows/${id}/execute`, {
method: 'POST',
body: JSON.stringify({ data }),
});
}
async getExecutions(filters?: {
workflowId?: string;
status?: string;
limit?: number
}): Promise<any> {
const query = new URLSearchParams();
if (filters?.workflowId) {
query.append('workflowId', filters.workflowId);
}
if (filters?.status) {
query.append('status', filters.status);
}
if (filters?.limit) {
query.append('limit', filters.limit.toString());
}
return this.request(`/executions${query.toString() ? `?${query}` : ''}`);
}
async getExecution(id: string): Promise<any> {
return this.request(`/executions/${id}`);
}
async deleteExecution(id: string): Promise<any> {
return this.request(`/executions/${id}`, {
method: 'DELETE',
});
}
// Credential operations
async getCredentialTypes(): Promise<any> {
return this.request('/credential-types');
}
async getCredentials(): Promise<any> {
return this.request('/credentials');
}
// Node operations
async getNodeTypes(): Promise<any> {
return this.request('/node-types');
}
async getNodeType(nodeType: string): Promise<any> {
return this.request(`/node-types/${nodeType}`);
}
}

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import { AuthManager } from '../src/utils/auth';
describe('AuthManager', () => {
let authManager: AuthManager;
beforeEach(() => {
authManager = new AuthManager();
});
describe('validateToken', () => {
it('should return true when no authentication is required', () => {
expect(authManager.validateToken('any-token')).toBe(true);
expect(authManager.validateToken(undefined)).toBe(true);
});
it('should validate static token correctly', () => {
const expectedToken = 'secret-token';
expect(authManager.validateToken('secret-token', expectedToken)).toBe(true);
expect(authManager.validateToken('wrong-token', expectedToken)).toBe(false);
expect(authManager.validateToken(undefined, expectedToken)).toBe(false);
});
it('should validate generated tokens', () => {
const token = authManager.generateToken(1);
expect(authManager.validateToken(token, 'expected-token')).toBe(true);
});
it('should reject expired tokens', () => {
jest.useFakeTimers();
const token = authManager.generateToken(1); // 1 hour expiry
// Token should be valid initially
expect(authManager.validateToken(token, 'expected-token')).toBe(true);
// Fast forward 2 hours
jest.advanceTimersByTime(2 * 60 * 60 * 1000);
// Token should be expired
expect(authManager.validateToken(token, 'expected-token')).toBe(false);
jest.useRealTimers();
});
});
describe('generateToken', () => {
it('should generate unique tokens', () => {
const token1 = authManager.generateToken();
const token2 = authManager.generateToken();
expect(token1).not.toBe(token2);
expect(token1).toHaveLength(64); // 32 bytes hex = 64 chars
});
it('should set custom expiry time', () => {
jest.useFakeTimers();
const token = authManager.generateToken(24); // 24 hours
// Token should be valid after 23 hours
jest.advanceTimersByTime(23 * 60 * 60 * 1000);
expect(authManager.validateToken(token, 'expected')).toBe(true);
// Token should expire after 25 hours
jest.advanceTimersByTime(2 * 60 * 60 * 1000);
expect(authManager.validateToken(token, 'expected')).toBe(false);
jest.useRealTimers();
});
});
describe('revokeToken', () => {
it('should revoke a generated token', () => {
const token = authManager.generateToken();
expect(authManager.validateToken(token, 'expected')).toBe(true);
authManager.revokeToken(token);
expect(authManager.validateToken(token, 'expected')).toBe(false);
});
});
describe('static methods', () => {
it('should hash tokens consistently', () => {
const token = 'my-secret-token';
const hash1 = AuthManager.hashToken(token);
const hash2 = AuthManager.hashToken(token);
expect(hash1).toBe(hash2);
expect(hash1).toHaveLength(64); // SHA256 hex = 64 chars
});
it('should compare tokens securely', () => {
const token = 'my-secret-token';
const hashedToken = AuthManager.hashToken(token);
expect(AuthManager.compareTokens(token, hashedToken)).toBe(true);
expect(AuthManager.compareTokens('wrong-token', hashedToken)).toBe(false);
});
});
});

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import { N8NMCPBridge } from '../src/utils/bridge';
describe('N8NMCPBridge', () => {
describe('n8nToMCPToolArgs', () => {
it('should extract json from n8n data object', () => {
const n8nData = { json: { foo: 'bar' } };
const result = N8NMCPBridge.n8nToMCPToolArgs(n8nData);
expect(result).toEqual({ foo: 'bar' });
});
it('should remove n8n metadata', () => {
const n8nData = { foo: 'bar', pairedItem: 0 };
const result = N8NMCPBridge.n8nToMCPToolArgs(n8nData);
expect(result).toEqual({ foo: 'bar' });
});
});
describe('mcpToN8NExecutionData', () => {
it('should convert MCP content array to n8n format', () => {
const mcpResponse = {
content: [{ type: 'text', text: '{"result": "success"}' }],
};
const result = N8NMCPBridge.mcpToN8NExecutionData(mcpResponse, 1);
expect(result).toEqual({
json: { result: 'success' },
pairedItem: 1,
});
});
it('should handle non-JSON text content', () => {
const mcpResponse = {
content: [{ type: 'text', text: 'plain text response' }],
};
const result = N8NMCPBridge.mcpToN8NExecutionData(mcpResponse);
expect(result).toEqual({
json: { result: 'plain text response' },
pairedItem: 0,
});
});
it('should handle direct object response', () => {
const mcpResponse = { foo: 'bar' };
const result = N8NMCPBridge.mcpToN8NExecutionData(mcpResponse);
expect(result).toEqual({
json: { foo: 'bar' },
pairedItem: 0,
});
});
});
describe('n8nWorkflowToMCP', () => {
it('should convert n8n workflow to MCP format', () => {
const n8nWorkflow = {
id: '123',
name: 'Test Workflow',
nodes: [
{
id: 'node1',
type: 'n8n-nodes-base.start',
name: 'Start',
parameters: {},
position: [100, 100],
},
],
connections: {},
settings: { executionOrder: 'v1' },
active: true,
createdAt: '2024-01-01T00:00:00Z',
updatedAt: '2024-01-02T00:00:00Z',
};
const result = N8NMCPBridge.n8nWorkflowToMCP(n8nWorkflow);
expect(result).toEqual({
id: '123',
name: 'Test Workflow',
description: '',
nodes: [
{
id: 'node1',
type: 'n8n-nodes-base.start',
name: 'Start',
parameters: {},
position: [100, 100],
},
],
connections: {},
settings: { executionOrder: 'v1' },
metadata: {
createdAt: '2024-01-01T00:00:00Z',
updatedAt: '2024-01-02T00:00:00Z',
active: true,
},
});
});
});
describe('mcpToN8NWorkflow', () => {
it('should convert MCP workflow to n8n format', () => {
const mcpWorkflow = {
name: 'Test Workflow',
nodes: [{ id: 'node1', type: 'n8n-nodes-base.start' }],
connections: { node1: { main: [[]] } },
};
const result = N8NMCPBridge.mcpToN8NWorkflow(mcpWorkflow);
expect(result).toEqual({
name: 'Test Workflow',
nodes: [{ id: 'node1', type: 'n8n-nodes-base.start' }],
connections: { node1: { main: [[]] } },
settings: { executionOrder: 'v1' },
staticData: null,
pinData: {},
});
});
});
describe('sanitizeData', () => {
it('should handle null and undefined', () => {
expect(N8NMCPBridge.sanitizeData(null)).toEqual({});
expect(N8NMCPBridge.sanitizeData(undefined)).toEqual({});
});
it('should wrap non-objects', () => {
expect(N8NMCPBridge.sanitizeData('string')).toEqual({ value: 'string' });
expect(N8NMCPBridge.sanitizeData(123)).toEqual({ value: 123 });
});
it('should handle circular references', () => {
const obj: any = { a: 1 };
obj.circular = obj;
const result = N8NMCPBridge.sanitizeData(obj);
expect(result).toEqual({ a: 1, circular: '[Circular]' });
});
});
describe('formatError', () => {
it('should format standard errors', () => {
const error = new Error('Test error');
error.stack = 'stack trace';
const result = N8NMCPBridge.formatError(error);
expect(result).toEqual({
message: 'Test error',
type: 'Error',
stack: 'stack trace',
details: {
code: undefined,
statusCode: undefined,
data: undefined,
},
});
});
it('should include additional error properties', () => {
const error: any = new Error('API error');
error.code = 'ERR_API';
error.statusCode = 404;
error.data = { field: 'value' };
const result = N8NMCPBridge.formatError(error);
expect(result.details).toEqual({
code: 'ERR_API',
statusCode: 404,
data: { field: 'value' },
});
});
});
});

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import {
MCPError,
N8NConnectionError,
AuthenticationError,
ValidationError,
ToolNotFoundError,
ResourceNotFoundError,
handleError,
withErrorHandling,
} from '../src/utils/error-handler';
import { logger } from '../src/utils/logger';
// Mock the logger
jest.mock('../src/utils/logger', () => ({
logger: {
error: jest.fn(),
},
}));
describe('Error Classes', () => {
describe('MCPError', () => {
it('should create error with all properties', () => {
const error = new MCPError('Test error', 'TEST_CODE', 400, { field: 'value' });
expect(error.message).toBe('Test error');
expect(error.code).toBe('TEST_CODE');
expect(error.statusCode).toBe(400);
expect(error.data).toEqual({ field: 'value' });
expect(error.name).toBe('MCPError');
});
});
describe('N8NConnectionError', () => {
it('should create connection error with correct code', () => {
const error = new N8NConnectionError('Connection failed');
expect(error.message).toBe('Connection failed');
expect(error.code).toBe('N8N_CONNECTION_ERROR');
expect(error.statusCode).toBe(503);
expect(error.name).toBe('N8NConnectionError');
});
});
describe('AuthenticationError', () => {
it('should create auth error with default message', () => {
const error = new AuthenticationError();
expect(error.message).toBe('Authentication failed');
expect(error.code).toBe('AUTH_ERROR');
expect(error.statusCode).toBe(401);
});
it('should accept custom message', () => {
const error = new AuthenticationError('Invalid token');
expect(error.message).toBe('Invalid token');
});
});
describe('ValidationError', () => {
it('should create validation error', () => {
const error = new ValidationError('Invalid input', { field: 'email' });
expect(error.message).toBe('Invalid input');
expect(error.code).toBe('VALIDATION_ERROR');
expect(error.statusCode).toBe(400);
expect(error.data).toEqual({ field: 'email' });
});
});
describe('ToolNotFoundError', () => {
it('should create tool not found error', () => {
const error = new ToolNotFoundError('myTool');
expect(error.message).toBe("Tool 'myTool' not found");
expect(error.code).toBe('TOOL_NOT_FOUND');
expect(error.statusCode).toBe(404);
});
});
describe('ResourceNotFoundError', () => {
it('should create resource not found error', () => {
const error = new ResourceNotFoundError('workflow://123');
expect(error.message).toBe("Resource 'workflow://123' not found");
expect(error.code).toBe('RESOURCE_NOT_FOUND');
expect(error.statusCode).toBe(404);
});
});
});
describe('handleError', () => {
it('should return MCPError instances as-is', () => {
const mcpError = new ValidationError('Test');
const result = handleError(mcpError);
expect(result).toBe(mcpError);
});
it('should handle HTTP 401 errors', () => {
const httpError = {
response: { status: 401, data: { message: 'Unauthorized' } },
};
const result = handleError(httpError);
expect(result).toBeInstanceOf(AuthenticationError);
expect(result.message).toBe('Unauthorized');
});
it('should handle HTTP 404 errors', () => {
const httpError = {
response: { status: 404, data: { message: 'Not found' } },
};
const result = handleError(httpError);
expect(result.code).toBe('NOT_FOUND');
expect(result.statusCode).toBe(404);
});
it('should handle HTTP 5xx errors', () => {
const httpError = {
response: { status: 503, data: { message: 'Service unavailable' } },
};
const result = handleError(httpError);
expect(result).toBeInstanceOf(N8NConnectionError);
});
it('should handle connection refused errors', () => {
const connError = { code: 'ECONNREFUSED' };
const result = handleError(connError);
expect(result).toBeInstanceOf(N8NConnectionError);
expect(result.message).toBe('Cannot connect to n8n API');
});
it('should handle generic errors', () => {
const error = new Error('Something went wrong');
const result = handleError(error);
expect(result.message).toBe('Something went wrong');
expect(result.code).toBe('UNKNOWN_ERROR');
expect(result.statusCode).toBe(500);
});
it('should handle errors without message', () => {
const error = {};
const result = handleError(error);
expect(result.message).toBe('An unexpected error occurred');
});
});
describe('withErrorHandling', () => {
it('should execute operation successfully', async () => {
const operation = jest.fn().mockResolvedValue('success');
const result = await withErrorHandling(operation, 'test operation');
expect(result).toBe('success');
expect(logger.error).not.toHaveBeenCalled();
});
it('should handle and log errors', async () => {
const error = new Error('Operation failed');
const operation = jest.fn().mockRejectedValue(error);
await expect(withErrorHandling(operation, 'test operation')).rejects.toThrow();
expect(logger.error).toHaveBeenCalledWith('Error in test operation:', error);
});
it('should transform errors using handleError', async () => {
const error = { code: 'ECONNREFUSED' };
const operation = jest.fn().mockRejectedValue(error);
try {
await withErrorHandling(operation, 'test operation');
} catch (err) {
expect(err).toBeInstanceOf(N8NConnectionError);
}
});
});

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import { Logger, LogLevel } from '../src/utils/logger';
describe('Logger', () => {
let logger: Logger;
let consoleErrorSpy: jest.SpyInstance;
let consoleWarnSpy: jest.SpyInstance;
let consoleLogSpy: jest.SpyInstance;
beforeEach(() => {
logger = new Logger({ timestamp: false, prefix: 'test' });
consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation();
consoleWarnSpy = jest.spyOn(console, 'warn').mockImplementation();
consoleLogSpy = jest.spyOn(console, 'log').mockImplementation();
});
afterEach(() => {
jest.restoreAllMocks();
});
describe('log levels', () => {
it('should only log errors when level is ERROR', () => {
logger.setLevel(LogLevel.ERROR);
logger.error('error message');
logger.warn('warn message');
logger.info('info message');
logger.debug('debug message');
expect(consoleErrorSpy).toHaveBeenCalledTimes(1);
expect(consoleWarnSpy).toHaveBeenCalledTimes(0);
expect(consoleLogSpy).toHaveBeenCalledTimes(0);
});
it('should log errors and warnings when level is WARN', () => {
logger.setLevel(LogLevel.WARN);
logger.error('error message');
logger.warn('warn message');
logger.info('info message');
logger.debug('debug message');
expect(consoleErrorSpy).toHaveBeenCalledTimes(1);
expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
expect(consoleLogSpy).toHaveBeenCalledTimes(0);
});
it('should log all except debug when level is INFO', () => {
logger.setLevel(LogLevel.INFO);
logger.error('error message');
logger.warn('warn message');
logger.info('info message');
logger.debug('debug message');
expect(consoleErrorSpy).toHaveBeenCalledTimes(1);
expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
expect(consoleLogSpy).toHaveBeenCalledTimes(1);
});
it('should log everything when level is DEBUG', () => {
logger.setLevel(LogLevel.DEBUG);
logger.error('error message');
logger.warn('warn message');
logger.info('info message');
logger.debug('debug message');
expect(consoleErrorSpy).toHaveBeenCalledTimes(1);
expect(consoleWarnSpy).toHaveBeenCalledTimes(1);
expect(consoleLogSpy).toHaveBeenCalledTimes(2); // info + debug
});
});
describe('message formatting', () => {
it('should include prefix in messages', () => {
logger.info('test message');
expect(consoleLogSpy).toHaveBeenCalledWith('[test] [INFO] test message');
});
it('should include timestamp when enabled', () => {
const timestampLogger = new Logger({ timestamp: true, prefix: 'test' });
const dateSpy = jest.spyOn(Date.prototype, 'toISOString').mockReturnValue('2024-01-01T00:00:00.000Z');
timestampLogger.info('test message');
expect(consoleLogSpy).toHaveBeenCalledWith('[2024-01-01T00:00:00.000Z] [test] [INFO] test message');
dateSpy.mockRestore();
});
it('should pass additional arguments', () => {
const obj = { foo: 'bar' };
logger.info('test message', obj, 123);
expect(consoleLogSpy).toHaveBeenCalledWith('[test] [INFO] test message', obj, 123);
});
});
describe('parseLogLevel', () => {
it('should parse log level strings correctly', () => {
expect(Logger.parseLogLevel('error')).toBe(LogLevel.ERROR);
expect(Logger.parseLogLevel('ERROR')).toBe(LogLevel.ERROR);
expect(Logger.parseLogLevel('warn')).toBe(LogLevel.WARN);
expect(Logger.parseLogLevel('info')).toBe(LogLevel.INFO);
expect(Logger.parseLogLevel('debug')).toBe(LogLevel.DEBUG);
expect(Logger.parseLogLevel('unknown')).toBe(LogLevel.INFO);
});
});
describe('singleton instance', () => {
it('should return the same instance', () => {
const instance1 = Logger.getInstance();
const instance2 = Logger.getInstance();
expect(instance1).toBe(instance2);
});
});
});

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{
"compilerOptions": {
"target": "ES2020",
"module": "commonjs",
"lib": ["ES2020"],
"outDir": "./dist",
"rootDir": "./src",
"strict": true,
"esModuleInterop": true,
"skipLibCheck": true,
"forceConsistentCasingInFileNames": true,
"resolveJsonModule": true,
"declaration": true,
"declarationMap": true,
"sourceMap": true,
"removeComments": true,
"noImplicitAny": true,
"strictNullChecks": true,
"strictFunctionTypes": true,
"strictBindCallApply": true,
"strictPropertyInitialization": true,
"noImplicitThis": true,
"alwaysStrict": true,
"noUnusedLocals": false,
"noUnusedParameters": false,
"noImplicitReturns": true,
"noFallthroughCasesInSwitch": true,
"moduleResolution": "node"
},
"include": ["src/**/*"],
"exclude": ["node_modules", "dist", "**/*.test.ts"]
}