Express OpenAPI Generator

This tool analyzes a Node.js Express project to produce a machine-readable OpenAPI Specification. It scans route registrations, HTTP methods, and path parameters to generate a cohesive document that describes available endpoints, inputs, and responses. Conceptually, it treats each Express route as an API contract item and maps it to OpenAPI path items and operations. Beneficiaries include API developers, product managers, and QA teams who need up-to-date docs and testable contracts. The generator focuses on core endpoints, parameter types, and basic response shapes, while supporting advanced schemas, reusable components, and security definitions for larger ecosystems. Use cases include documenting public REST APIs, feeding contract-first workflows, and powering automated tests and client SDK generation. Core differentiators are its focus on Express-specific patterns, support for TypeScript and JSDoc when available, and seamless output in JSON or YAML that integrates with CI/CD.
Core features include path parameter extraction, operation mapping (GET/POST/PUT/DELETE), requestBody assembly from body-parser usage, basic response schemas, and optional components consolidation. It also provides versioning hooks and server metadata to reflect deployment environments. The tool is designed to generate a solid first-pass contract that teams can refine, rather than a complete runtime analysis engine. Use cases span early API design, incremental migration to OpenAPI, and documentation synchronization across services.