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API Interceptor

Block API requests that match your custom regular expressions. Simplify front-end testing by simulating network failures without ever reloading your web page.

Features

  • 🚫 Block requests using custom regex patterns
  • 🎯 Target specific APIs with precise pattern matching
  • 💾 Persistent settings - your patterns and state are saved
  • ⚡ Real-time control - enable/disable blocking instantly
  • ✅ Pattern validation - validates regex before applying
  • 🔒 Privacy-focused - minimal permissions, no data collection

How to Use

  1. Click the extension icon to open the popup
  2. Enter a regex pattern to match URLs you want to block (e.g., .*api\.example\.com.*)
  3. Click "Save & Apply" to save your pattern
  4. Toggle the switch to enable/disable blocking
  5. Your settings persist across browser sessions

Examples

Block all requests to a specific API:

.*api\.example\.com.*

Block all API endpoints:

.*\/api\/.*

Block analytics services:

.*analytics.*

Permissions

  • declarativeNetRequest - Required to block network requests
  • storage - Required to save your settings
  • host_permissions: <all_urls> - Required to intercept requests on all websites

Privacy

This extension does not collect, store, or transmit any personal data. All settings are stored locally on your device.