I Built a Chrome Extension to Simulate API Responses Instantly

hritik sharma — Sat, 07 Mar 2026 10:40:31 +0000

During software development, frontend work often depends on backend APIs that may not always be ready.

This creates common challenges:

While there are tools available for API mocking, many of them require additional setup such as proxies or backend configuration.

I wanted a simpler solution that works directly inside the browser.

So I built a browser extension for Google Chrome that allows developers to intercept API requests and return custom responses instantly.

What the Extension Does

The extension lets developers define rules that match specific API requests.

When a request matches a rule, the extension can return a mocked response instead of the original response from the server.

All of this happens directly in the browser without modifying the application code.

Why This Is Useful

Full Technical Article

I wrote a detailed blog post explaining the architecture, implementation, and examples.

You can read the full article here:

DEV Community: hritik sharma