MCP Debugger

A Node.js module for debugging API calls and running Postman collections with automatic authentication.

Features

• API Debugging: Debug API calls with detailed request and response logging
• Postman Collection Runner: Run Postman collections with Newman
• Automatic Authentication: Automatically add authentication headers to API calls
• OpenAI API Integration: Test OpenAI API calls with a simple endpoint
• Web Interface: View debug status and API documentation in a web interface

Installation

As a Global Command

npm install -g mcp-debugger

As a Project Dependency

npm install mcp-debugger

Configuration

Create a .env file in your project root with your API keys:

# API Keys
OPENAI_API_KEY=your_openai_api_key
STRIPE_KEY=your_stripe_key
GITHUB_TOKEN=your_github_token

# Newman Configuration
NEWMAN_TIMEOUT=60000
NEWMAN_ITERATIONS=1

# Server Configuration
PORT=3002
NODE_ENV=development

You can also use the provided .env.example file as a template:

cp .env.example .env

Usage

Command Line Interface

# Start the server with default options
mcp-debugger

# Start the server with custom port
mcp-debugger --port 3003

# Start the server in production mode
mcp-debugger --env production

# Show help
mcp-debugger --help

Programmatic Usage

const McpDebugger = require('mcp-debugger');

// Create a new instance with default options
const server = new McpDebugger();

// Create a new instance with custom options
const server = new McpDebugger({
  port: 3003,
  env: 'production',
  newmanTimeout: 30000,
  newmanIterations: 2
});

// Start the server
server.start()
  .then(() => {
    console.log('Server started');
  })
  .catch(err => {
    console.error('Failed to start server:', err);
  });

// Stop the server
server.stop()
  .then(() => {
    console.log('Server stopped');
  })
  .catch(err => {
    console.error('Failed to stop server:', err);
  });

// Enable debug mode for a URL
server.enableDebug('/api/status');

// Enable debug mode for all URLs
server.enableDebug('*');

// Disable debug mode for a URL
server.disableDebug('/api/status');

// Get debug status
const status = server.getDebugStatus();
console.log(status);

// Get the Express app instance for further customization
const app = server.getApp();
app.get('/custom-endpoint', (req, res) => {
  res.json({ message: 'Custom endpoint' });
});

API Endpoints

Debug Endpoints

• POST /debug/on: Enable debug mode for a URL
• POST /debug/off: Disable debug mode for a URL
• GET /debug/status: Check which URLs are in debug mode (JSON)
• GET /debug/status/view: View debug status in browser

API Endpoints

• GET /api/status: Check API status
• POST /api/run-collection: Run a Postman collection
• POST /test-api: Test OpenAI API integration with a "Hello world" prompt

Debug Mode Examples

# Enable debug mode for a specific URL
curl -X POST http://localhost:3002/debug/on \
  -H "Content-Type: application/json" \
  -d '{
    "url": "/api/status"
  }'

# Enable debug mode for all URLs (using wildcard)
curl -X POST http://localhost:3002/debug/on \
  -H "Content-Type: application/json" \
  -d '{
    "url": "*"
  }'

# Disable debug mode for a URL
curl -X POST http://localhost:3002/debug/off \
  -H "Content-Type: application/json" \
  -d '{
    "url": "/api/status"
  }'

# Check debug status
curl http://localhost:3002/debug/status

Running Postman Collections

# Run a Postman collection
curl -X POST http://localhost:3002/api/run-collection \
  -H "Content-Type: application/json" \
  -d '{
    "collectionPath": "./collections/example.json",
    "environmentPath": "./collections/example-environment.json"
  }'

Testing OpenAI API

# Test OpenAI API integration with a "Hello world" prompt
curl -X POST http://localhost:3002/test-api \
  -H "Content-Type: application/json"

Automatic Authentication

The application automatically detects which service is being called in your Postman collections and adds the appropriate authentication headers using the API keys from your .env file.

Supported Services

• OpenAI: Uses OPENAI_API_KEY for api.openai.com
• Stripe: Uses STRIPE_KEY for api.stripe.com
• GitHub: Uses GITHUB_TOKEN for api.github.com

Detailed Response Logging

When running Postman collections, the application provides comprehensive logging of all requests and responses in the terminal, including:

• Request Details: Method, URL, headers, and body
• Response Details: Status code, response time, headers, and body
• Test Results: All test assertions with pass/fail status

This detailed logging makes it easier to debug API calls and understand the complete request/response cycle.

License

This project is licensed under the MIT License - see the LICENSE file for details.