Intercepto - API Mocking & Request Interceptor

Mock API calls instantly in your browser. Change status codes and JSON response bodies on the fly. 100% local frontend testing tool.

Intercepto is a lightweight Chrome extension that allows frontend developers, QA engineers, and API testers to intercept, mock, and override HTTP API requests directly within the browser no backend changes required. Effortlessly test edge cases, error states, and unreleased API endpoints by customising HTTP status codes (200, 404, 500, etc.) and response bodies on the fly. 🚀 Key Features: • Instant Request Interception: Match incoming network calls by URL pattern and HTTP method (GET, POST, PUT, DELETE, PATCH). • Custom Status Codes: Easily test how your application handles 200 OK, 401 Unauthorized, 404 Not Found, 500 Server Errors, and custom codes. • Dynamic Response Bodies: Mock JSON or text response payloads right inside your browser session. • Rule-Based Execution: Create, toggle, and manage multiple interceptor rules with a clean UI. • Fast & Lightweight: Zero overhead, no heavy background dependencies, and 100% privacy-focused. 💡 Common Use Cases: • Frontend Development: Build UI components before backend API endpoints are ready. • QA & Bug Testing: Instantly reproduce edge cases, network failures, and bad gateway errors without touching server logs. • Demo & Sandbox Environments: Present consistent test data during live product presentations. • Offline & Isolated Testing: Prototype features without needing a local backend running. 🔒 Privacy & Security First: Intercepto operates entirely locally inside your browser. Your network requests, payloads, and rules are never sent to external servers or third parties. Get started in seconds—install Intercepto today to simplify your Web API development workflow!