API Interceptor & OpenAPI Synthesizer

DevTools extension to passively capture network traffic, infer JSON schemas, and export OpenAPI 3.0 / Postman collections.

Automate API documentation, client types, and test mocks directly from your Chrome DevTools! API Interceptor & OpenAPI Synthesizer passively captures your web application's HTTP/REST traffic in real-time, automatically normalizes dynamic URL parameters, infers data types, and exports production-grade API specifications in seconds. ⚡ KEY CAPABILITIES: • Passive Network Capture: Seamlessly intercepts XHR and fetch requests via DevTools without modifying or slowing down your page. • Smart Path Normalization: Automatically detects path parameters (e.g., converts /orders/123 -> /orders/{id} and /items/550e8400-... -> /items/{uuid}). • Deep Schema Inference: Deduplicates repeated requests and synthesizes OpenAPI 3.0 schemas, detecting formats like date-time, email, and uuid. • 5 Production Export Formats: 1. OpenAPI 3.0.0 Specification (JSON) – ready for Swagger, Redoc, or API Gateways. 2. Postman Collection v2.1.0 – pre-configured with baseUrl, path variables & example responses. 3. TypeScript Definitions (.d.ts / .ts) – strongly-typed interfaces for React, Next.js & Node.js. 4. Zod Schemas (zod.ts) – runtime validation schemas with automatic z.infer types. 5. Mock Service Worker v2 (handlers.ts) – instant mock handlers for unit & E2E tests. • Built-in Secret Masking: Automatically masks Bearer tokens, cookies, passwords, and sensitive API keys before exporting. • Code Generator: Instant code snippets in cURL, Fetch, Axios, and Python. 🔒 100% PRIVATE & LOCAL: All schema inference, JSON parsing, and code generation run completely offline and locally in your browser. No request or response data ever leaves your computer. 💡 PERFECT FOR: Frontend & Full-stack developers reverse-engineering undocumented APIs, creating test mocks, generating TypeScript types, or migrating to OpenAPI/Swagger. 💳 PRICING: • Free Trial: Includes 3 full exports. Single endpoint code inspection and snippet copying is 100% free forever. • Lifetime Pro ($29 USD): One-time purchase for unlimited exports of all formats. No recurring subscriptions.