Run web clients without backends by mocking HTTP requests

What is Interceptor?
Interceptor is a browser extension that lets front-end developers define their own responses for HTTP requests, allowing them to work without relying on a backend. It provides the ability to return mock data instead of data from the server, reducing the need to wait for backend changes during development.
Users: 269 ▲ 4
Rating: 3.00 (6)
Version: 0.3.1 (Last updated: 2018-08-22)
Creation date: 2018-04-06
Weekly download count: 10
Firefox on Android: Yes
Risk impact: High risk impact
Risk likelihood: Low risk likelihood
Manifest version: 2
  • webRequest
  • tabs
  • webRequestBlocking
  • http://*/*
  • https://*/*
  • storage
  • webNavigation
Size: 322.79K
URLs: Website
Stats date:

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Not available on Chrome
Not available on Edge
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Run web clients without backends by mocking HTTP requests

During development, often times front-end devs have to wait for the back-end devs to offer an API to work on. Even after the API is given, if the front-end team wants a different set of data to work on, they again need to wait for the changes to be made and hosted. We, front-end developers resort to techniques like storing the data in a variable or using mock API’s.

To overcome this, we are working on a browser extension Interceptor, which lets you define your own response, and everytime the browser requests data from a particular URL, returns you with mock data instead of, from the server.

This blog post Interceptor : Your Own Mock Server inside the browser makes things much more clear.


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User reviews
intercepts but does not auto respond to the request. What's the difference between the toggler and the "intercept" button ?
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Risk impact

Interceptor is risky to use as it requires a number of sensitive permissions that can potentially harm your browser and steal your data. Exercise caution when installing this add-on. Review carefully before installing. We recommend that you only install Interceptor if you trust the publisher.

Risk likelihood

Interceptor has earned a fairly good reputation and likely can be trusted.

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