OpenAPI to MCP Generator (openapi-mcp-generator)

- 🔧 OpenAPI 3.0 Support: Converts any OpenAPI 3.0+ spec into an MCP-compatible server.
- 🔁 Proxy Behavior: Proxies calls to your original REST API while validating request structure and security.
- 🔐 Authentication Support: API keys, Bearer tokens, Basic auth, and OAuth2 supported via environment variables.
- 🧪 Zod Validation: Automatically generates Zod schemas from OpenAPI definitions for runtime input validation.
- ⚙️ Typed Server: Fully typed, maintainable TypeScript code output.
- 🔌 Multiple Transports: Communicate over stdio, SSE via Hono, or StreamableHTTP.
- 🧰 Project Scaffold: Generates a complete Node.js project with tsconfig.json, package.json, and entry point.
- 🧪 Built-in HTML Test Clients: Test API interactions visually in your browser (for web-based transports).

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npm install -g openapi-mcp-generator

> You can also use yarn global add openapi-mcp-generator or pnpm add -g openapi-mcp-generator

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Configure auth credentials in your environment:
| Auth Type  | Variable Format                                                                                    |

| ---------- | -------------------------------------------------------------------------------------------------- |

| API Key    | API_KEY_<SCHEME_NAME>                                                                            |

| Bearer     | BEARER_TOKEN_<SCHEME_NAME>                                                                       |

| Basic Auth | BASIC_USERNAME_<SCHEME_NAME>, BASIC_PASSWORD_<SCHEME_NAME>                                     |

| OAuth2     | OAUTH_CLIENT_ID_<SCHEME_NAME>, OAUTH_CLIENT_SECRET_<SCHEME_NAME>, OAUTH_SCOPES_<SCHEME_NAME> |
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