openapi-mcp-generator
MCP ServerFreeA tool that converts OpenAPI specifications to MCP server
Capabilities13 decomposed
openapi 3.0+ specification parsing and dereferencing
Medium confidenceParses and fully dereferences OpenAPI 3.0+ specifications using @apidevtools/swagger-parser, resolving all $ref pointers and external schema definitions into a unified in-memory representation. Handles both local file paths and remote URLs, normalizing the specification structure for downstream tool extraction and validation schema generation.
Uses @apidevtools/swagger-parser for full dereferencing with automatic $ref resolution, rather than naive regex-based reference handling, ensuring complex nested schemas and external definitions are correctly flattened into a single canonical representation
More robust than manual OpenAPI parsing because it handles recursive $refs, external schema files, and circular references automatically, whereas custom parsers often fail on complex real-world APIs
rest api operation extraction to mcp tool definitions
Medium confidenceConverts OpenAPI paths and operations into McpToolDefinition[] array by extracting operation metadata (operationId, summary, description), parameter schemas, request/response bodies, and HTTP method details. Maps REST semantics (path params, query params, headers, request bodies) to MCP tool input schemas with proper categorization and naming conventions.
Implements extractToolsFromApi() function that maps REST operation semantics directly to MCP tool contracts, preserving parameter types, required fields, and descriptions in a single pass, rather than requiring manual tool definition or separate schema transformation steps
Faster and more accurate than manual tool definition because it automatically extracts all operation metadata from OpenAPI in one pass, whereas manual approaches require developers to re-specify each parameter and description
rest api request proxying with axios http client
Medium confidenceProxies validated MCP tool calls to target REST APIs using axios HTTP client, handling request construction (method, URL, headers, body), response parsing, and error handling. Automatically constructs URLs from OpenAPI path templates and parameters, injects authentication headers, and returns API responses to MCP clients with appropriate status code and body mapping.
Uses axios to construct and execute HTTP requests based on OpenAPI operation definitions, automatically mapping MCP tool inputs to REST parameters (path, query, body) and handling response parsing, whereas manual proxying requires explicit URL construction and header management
More maintainable than manual HTTP construction because URL templates, parameter mapping, and headers are derived from OpenAPI definitions, reducing the risk of mismatches between spec and implementation
typescript type definitions and schema export for generated code
Medium confidenceExports McpToolDefinition type and other type definitions for use in generated code and programmatic API, providing TypeScript type safety for tool definitions, input schemas, and configuration objects. Type definitions are included in the generated project's tsconfig.json and enable IDE autocomplete and compile-time type checking.
Generates and exports McpToolDefinition type alongside code, enabling type-safe programmatic API usage and IDE support in generated projects, whereas many generators only produce untyped JavaScript output
More developer-friendly than untyped code because TypeScript type checking catches errors at compile time and IDEs provide autocomplete, whereas untyped approaches require runtime testing to catch type mismatches
generated project dependency management and package.json configuration
Medium confidenceGenerates package.json with all required runtime dependencies (@modelcontextprotocol/sdk, axios, zod, Hono for web/HTTP transports) and development dependencies (TypeScript, @types packages), with pinned versions for reproducibility. Includes scripts for building, running, and testing the generated server, making the project immediately deployable with npm install && npm start.
Generates transport-specific package.json with only required dependencies (e.g., Hono only for web/HTTP transports, not for stdio), reducing bundle size and dependency bloat compared to generators that include all optional dependencies
More efficient than monolithic dependency lists because transport-specific dependencies are only included when needed, whereas generic generators include all possible dependencies regardless of transport mode
json schema to zod validation schema code generation
Medium confidenceTransforms OpenAPI JSON Schema definitions into executable Zod validation code via json-schema-to-zod library integration. Generates TypeScript code strings that define Zod schemas for request/response validation, handling type mappings (string, number, boolean, object, array), constraints (minLength, maxLength, pattern, enum), and nested object structures.
Leverages json-schema-to-zod library to automatically transpile JSON Schema constraints into Zod validation code, enabling runtime type checking without manual schema duplication, whereas most generators either skip validation or require hand-written schemas
More maintainable than manual Zod schema writing because schema definitions stay in OpenAPI and are auto-generated, reducing drift between API documentation and validation logic
multi-transport mcp server code generation (stdio, sse, http)
Medium confidenceGenerates complete TypeScript MCP server implementations supporting three transport modes: stdio (standard input/output for local processes), SSE (Server-Sent Events via Hono web server for browser clients), and streamable-http (HTTP with streaming responses via Hono). Each transport generates transport-specific entry points (index.ts for stdio, web-server.ts for SSE, streamable-http.ts for HTTP) with appropriate request/response handling and dependency injection.
Generates transport-specific entry points from a single OpenAPI spec, with Hono-based web/HTTP servers and native stdio support, allowing the same API to be deployed as a CLI tool, web service, or HTTP endpoint without code duplication
More flexible than single-transport generators because it supports three distinct deployment models from one spec, whereas most MCP generators only support stdio or require manual transport layer implementation
openapi x-mcp extension filtering for selective tool exposure
Medium confidenceParses and respects the x-mcp OpenAPI extension to selectively include or exclude operations from MCP tool generation. Allows API developers to annotate operations with x-mcp: {enabled: false} to hide internal or deprecated endpoints from MCP exposure, providing fine-grained control over which REST operations become MCP tools without modifying the OpenAPI spec structure.
Implements custom x-mcp OpenAPI extension for declarative operation filtering, allowing API specs to define MCP visibility inline without external configuration files, whereas most generators expose all operations or require separate allowlist/blocklist files
More maintainable than external filtering configs because visibility rules stay in the OpenAPI spec alongside operation definitions, reducing configuration drift and making intent explicit to API maintainers
authentication credential injection from environment variables
Medium confidenceGenerates code to inject API authentication credentials (API keys, Bearer tokens, Basic auth, OAuth2) from environment variables into outbound REST API requests. Creates .env.example template files documenting required authentication variables and generates request interceptor code that automatically adds Authorization headers or query parameters based on the OpenAPI securitySchemes definition.
Generates auth credential injection code from OpenAPI securitySchemes, automatically creating .env.example templates and request interceptors for multiple auth types, whereas most generators either ignore auth or require manual credential handling code
Safer than hardcoded credentials and more convenient than manual auth code because credentials are injected automatically from environment variables, reducing the risk of accidental credential exposure in generated source files
complete node.js mcp server project scaffolding
Medium confidenceGenerates a complete, runnable Node.js project structure including package.json with all dependencies (@modelcontextprotocol/sdk, axios, zod, Hono), tsconfig.json, .gitignore, and src/ directory with MCP server implementation. The generated project is immediately executable without additional configuration, with all tool handlers, validation schemas, and transport implementations pre-wired.
Generates a fully functional, immediately-runnable Node.js project with all dependencies pre-configured and tool handlers pre-wired, rather than generating isolated code snippets that require manual integration into an existing project structure
Faster to deploy than manual project setup because the entire project structure, dependencies, and boilerplate are generated in one step, whereas manual approaches require setting up package.json, tsconfig, and handler scaffolding separately
cli interface with command-line options for generation configuration
Medium confidenceProvides a command-line interface accepting options for OpenAPI spec path/URL, output directory, transport mode selection, and filtering parameters. Parses CLI arguments and invokes the code generation pipeline, with support for both local file paths and remote URLs, making the generator accessible to developers without programmatic API knowledge.
Exposes generation pipeline via CLI with support for both local and remote OpenAPI specs, making the tool accessible to non-Node.js developers and CI/CD systems without requiring programmatic API knowledge
More accessible than programmatic-only APIs because developers can invoke generation from shell scripts and CI/CD pipelines without writing Node.js code, whereas library-only approaches require JavaScript/TypeScript integration
programmatic api for integration into node.js applications
Medium confidenceExports getToolsFromOpenApi() function and McpToolDefinition type for programmatic use in Node.js applications, allowing developers to invoke tool extraction and schema generation from within their own code. Supports API options and filtering parameters, enabling dynamic MCP server generation without CLI invocation.
Exports getToolsFromOpenApi() function and type definitions for programmatic tool extraction, allowing developers to integrate generation logic into custom applications rather than relying solely on CLI invocation
More flexible than CLI-only tools because developers can invoke generation dynamically at runtime and integrate results into custom workflows, whereas CLI-only approaches require separate process invocation and file I/O
runtime request validation using generated zod schemas
Medium confidenceValidates incoming MCP tool calls against generated Zod schemas before proxying to REST APIs, catching invalid inputs early and returning structured validation errors to MCP clients. Zod schemas are embedded in generated server code and invoked at tool handler execution time, providing type safety and preventing malformed requests from reaching the target API.
Embeds Zod validation schemas directly in generated tool handlers, validating inputs at execution time before proxying to REST APIs, whereas many generators skip validation or only perform static type checking
More robust than no validation because invalid inputs are caught before reaching the backend API, reducing error rates and improving reliability, whereas unvalidated proxies may pass malformed requests through
Capabilities are decomposed by AI analysis. Each maps to specific user intents and improves with match feedback.
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Best For
- ✓Teams integrating REST APIs with AI agents via MCP
- ✓Developers automating API proxy generation from OpenAPI docs
- ✓AI agent developers who want to expose REST APIs as callable tools
- ✓Teams building API proxies that need to preserve operation semantics
- ✓Developers building MCP proxies for existing REST APIs
- ✓Teams wanting to expose REST APIs to AI agents without modifying the backend
- ✓TypeScript developers wanting type safety in generated code
- ✓Teams using IDEs with TypeScript support (VS Code, WebStorm, etc.)
Known Limitations
- ⚠Requires valid OpenAPI 3.0+ syntax; malformed specs will fail parsing with limited error context
- ⚠Remote URL resolution depends on network availability and CORS/authentication headers
- ⚠Large specifications (>10MB) may cause memory pressure during dereferencing
- ⚠Only extracts operations explicitly defined in OpenAPI paths; undocumented endpoints are ignored
- ⚠Complex request bodies (multipart/form-data, file uploads) may require manual post-processing
- ⚠Circular schema references in request/response bodies can cause infinite loops during extraction
Requirements
Input / Output
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Repository Details
Last commit: Mar 3, 2026
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A tool that converts OpenAPI specifications to MCP server
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