Intercept & Override
Network Requests

The ultimate browser extension for developers. Mock APIs, override responses, and test your applications with ease.

Add to Chrome

API Override

{ "status": "success" }

URL Redirect

api.old.com → api.new.com

Headers

+ Authorization: Bearer...

Powerful Features for Developers

Everything you need to test, debug, and develop web applications more efficiently

Response Overrides

Mock API responses with custom JSON data. Perfect for testing edge cases and offline development.

URL Redirection

Redirect requests to different endpoints. Test against staging, local, or alternative APIs seamlessly.

Header Modification

Add, modify, or remove request headers. Perfect for authentication testing and API debugging.

Real-time Control

Enable or disable rules instantly. No page refresh required. Perfect for rapid testing workflows.

Secure & Private

All processing happens locally in your browser. No data is sent to external servers.

Developer Friendly

Intuitive interface with powerful pattern matching. Supports wildcards and regex patterns.

How It Works

Get started in three simple steps

Install Extension

Add Interzept to your browser from the Chrome Web Store or Firefox Add-ons

Create Rules

Define URL patterns and specify how requests should be intercepted or modified

Start Testing

Your rules are active immediately. Test your application with mocked responses

Perfect For

Common development scenarios where Interzept shines

Frontend Development

• Mock API responses during development
• Test error handling and edge cases
• Work offline with realistic data
• Simulate slow network conditions

API Testing

• Test against different API versions
• Add authentication headers automatically
• Redirect to staging environments
• Debug third-party integrations

QA & Testing

• Simulate server errors and timeouts
• Test with different response formats
• Validate error handling flows
• Create reproducible test scenarios

Debugging

• Isolate frontend from backend issues
• Test fixes without server changes
• Reproduce production scenarios locally
• Validate API contract changes

Ready to Supercharge Your Development?

Join thousands of developers who use Interzept to build better web applications faster.