Mocxy — API Interceptor & Mock

Intercept, redirect, rewrite and mock API requests. Block requests, inject JS/CSS, match by URL, headers, query params and payload.

Mocxy is a developer tool for intercepting and controlling HTTP traffic directly in Chrome — no proxy, no cert install, no system config. ✦ INTERCEPT & MODIFY • Redirect requests to a different host • Rewrite URL paths with regex find & replace • Modify request and response headers • Block/cancel requests • Add artificial delays and jitter ✦ MOCK APIs • Return inline mock responses — zero network calls • Match by URL, method, query params, request headers, and body (JSONPath, regex, or custom JS) • WireMock-style priority ordering across collections • Simulate faults: network error, empty response ✦ POWERFUL MATCHING • URL: contains, equals, regex, path pattern • GraphQL: match by operation name and type • Payload: JSONPath expressions, regex, custom JS • Query parameters: equals, contains, regex, absent ✦ VISIBILITY • Live request log (intercepted-only by default) • Request diff showing original vs modified URL • Rule preview with VS Code-style JSON viewer ✦ WORKFLOW • Import/export rules as JSON • Drag-to-reorder rule priority • Dark and light theme