Swagger to MCP Server

Convert any Swagger/OpenAPI specification into a dynamic Model Context Protocol (MCP) server.

Features

• 🚀 Automatically generates MCP tools from Swagger/OpenAPI specs

• 📘 Supports both local files (.yaml, .yml, .json) and remote URLs

• ✅ Built-in JSON schema validation using AJV

• 🔄 Dynamic endpoint mapping with path parameters

• 🪶 Generates MCP manifest (mcp.json) for easy integration

Installation

pnpm install

Usage

Start the MCP server

pnpm start

Or with a custom Swagger file:

node server.js --swagger=./path/to/your/spec.yaml

Generate manifest only (without starting server)

node server.js --swagger=./petstore.yaml --manifest-only

Use a remote Swagger URL

node server.js --swagger=https://petstore.swagger.io/v2/swagger.json

Configuration

Create a .env file to configure the server:

MCP_PORT=4000

How It Works

1. Load Swagger/OpenAPI spec - From local file or URL

2. Parse endpoints - Extract all paths and operations

3. Generate MCP tools - Each endpoint becomes an MCP tool with:

   • Input schema validation

   • Output schema definition

   • HTTP request handler

4. Start MCP server - Listen on configured port and handle tool requests

Example

The included petstore.yaml provides a simple example:

openapi: 3.0.1
info:
  title: Swagger Petstore
  version: 1.0.0
servers:
  - url: https://petstore.swagger.io/v2
paths:
  /pet/{petId}:
    get:
      summary: Find pet by ID
      operationId: getPetById
      parameters:
        - name: petId
          in: path
          required: true
          schema:
            type: integer
      responses:
        '200':
          description: successful operation

This generates an MCP tool that can fetch pet information by ID.

License

MIT