Mocxy — API Interceptor & Mock

About

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