Swagger Explorer MCP

A Management Control Plane (MCP) server for exploring and analyzing Swagger/OpenAPI specifications through Claude.

Quick Start

Install and run globally using npx:

npx -y @johnneerdael/swagger-mcp

Or install with environment variables:

npx -y @johnneerdael/swagger-mcp \
  --env BASE_URL=/api \
  --env AUTH_TOKEN=your-token \
  --env PORT=3000

Installation for Claude Desktop

Open Claude Desktop
Click on Settings (gear icon)
Select "Tools & Integrations"
Click "Add MCP Server"
Enter the following:
Name: Swagger Explorer Command: npx -y @johnneerdael/swagger-mcp Arguments: --swagger-url=$SWAGGER_URL
Click "Install"

Usage with Claude

Here are some example interactions with Claude:

Basic Swagger Exploration

Human: Can you explore the Swagger documentation at http://localhost:8080/docs?

Claude: I'll help you explore that Swagger documentation using the Swagger Explorer MCP.

Let me analyze the API endpoints and schemas for you:

[Claude would then use the MCP to fetch and analyze the Swagger documentation]

Analyzing Specific Endpoints

Human: What are the available response schemas for the /pets POST endpoint?

Claude: I'll check the response schemas for that endpoint using the MCP.

[Claude would use the MCP to fetch specific endpoint details]

Schema Analysis

Human: Can you show me the detailed structure of the Pet schema?

Claude: I'll retrieve the detailed schema information using the MCP.

[Claude would use the MCP to analyze the schema structure]

Features

Authentication Support
- Bearer token authentication
- Configurable through environment variables
Custom Response Formatting
- Minimal format: Removes null/empty values
- Detailed format: Includes metadata and timestamps
- Raw format: Unmodified response
Schema Analysis
- Detailed property exploration
- Response schema analysis
- Schema relationships
API Exploration
- Path listing
- Method filtering
- Response format analysis

Configuration

Environment Variables:

BASE_URL: Base path for the API (default: '')
AUTH_TOKEN: Bearer token for authentication
PORT: Server port (default: 3000)
SWAGGER_URL: Default Swagger documentation URL

API Endpoints

Explore API

curl -X POST http://localhost:3000/api/explore \
  -H "Authorization: Bearer your-token" \
  -H "Content-Type: application/json" \
  -d '{
    "url": "http://your-swagger-url",
    "options": {
      "paths": true,
      "schemas": true
    }
  }'

Get Schema Details

curl -X POST http://localhost:3000/api/schema-details \
  -H "Authorization: Bearer your-token" \
  -H "Content-Type: application/json" \
  -d '{
    "url": "http://your-swagger-url",
    "schemaName": "Pet"
  }'

Get Response Schemas

curl -X POST http://localhost:3000/api/response-schemas \
  -H "Authorization: Bearer your-token" \
  -H "Content-Type: application/json" \
  -d '{
    "url": "http://your-swagger-url",
    "path": "/pets",
    "method": "post"
  }'

Response Formats

Minimal Format

{
  "status": "success",
  "data": {
    // Only non-null values
  }
}

Detailed Format

{
  "status": "success",
  "timestamp": "2025-01-29T10:00:00.000Z",
  "data": {
    // Full response
  },
  "metadata": {
    "version": "1.0",
    "format": "detailed"
  }
}

Common Use Cases

API Documentation Review
Human: Can you summarize all the available endpoints and their purposes?
Schema Validation
Human: What fields are required for creating a new pet?
Response Analysis
Human: What are the possible error responses for the login endpoint?
Integration Planning
Human: How should I structure my request to create a new order?

Troubleshooting

Connection Issues
- Ensure the Swagger URL is accessible
- Check if authentication token is correct
- Verify port is not in use
Authorization Errors
- Verify AUTH_TOKEN is set correctly
- Ensure bearer token is included in requests
Schema Not Found
- Check if schema name is exact match
- Verify Swagger spec is loaded correctly

Security Notes

The MCP requires authentication if AUTH_TOKEN is set
All requests are logged for debugging
Sensitive information is not cached
Rate limiting is applied to prevent abuse

Development

To contribute or modify:

Clone the repository
Install dependencies:
npm install
Build:
npm run build
Run locally:
npm start

License

MIT License - See LICENSE file for details