Interceptor – mock AJAX requests at the browser level
Introducing Interceptor - A browser extension that mocks backend responses and how to use it.
Interceptor – mock AJAX requests at the browser level launched on May 2, 2018 with 60 votes, #872 of 2,986 launches that month and more than 90% of that year's launches. The site was still online in September 2026, 8 years on.
In plain words
Interceptor is a browser extension that intercepts AJAX requests and returns mock data instead of responses from the server. It lets frontend developers define custom responses for specific URLs, allowing them to work independently without waiting for backend APIs to be ready or modified. The tool is designed for developers who need to test with different datasets during the development process.
written from the facts on this page · September 2026
From the sources
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. Let's say we are developing a simple web-app which tries to autocomplete the name of the countries…from crypt.codemancers.com
Does a similar job
all alternatives →
HTTP Mock – Intercept, debug and mock HTTP(S) with zero setup2019 · httptoolkit.tech · ▲341Beautiful, cross-platform & open-source tools for debugging, testing and building with HTTP(S), on Windows, Linux & Mac.
- IRIntercept.rest – Faster API debugging2018 · ▲89
Sharing an internal tool that accelerated my development work 10-fold, especially with API debugging. Thought fellow developers here might find it useful. As a developer, I often have trouble reproducing errors at the client end. https://intercept.rest lets me debug and monitor API requests and responses. It is similar to the Network tab in Chrome Developer Tools but works for any API: mobile apps, webhooks, frontend etc. After I shared it with a close circle of friends, they found it incredibly useful and even found new use cases, I never imagined. Been a long time lurker here and…
API Interceptor, Mocker and TesterMay 2026 · chromewebstore.google.com · ▲2Intercept, modify, mock and test HTTP requests with ease
Request Interceptor ProFeb 2026 · chromewebstore.google.com · ▲5Intercept, modify, and replay HTTP request son the fly
Postman Interceptor2020 · chromewebstore.google.com · ▲78Postman companion to sync cookies & capture network requests
More life & fun this month
the category →
A free city-building game in your browser. You are the mayor. You know what the city needs. Now get it past the zoning board, the neighbors, the appeals court and the next election.
Life & fun · 22h ago · permit.petercai.com
- IV
Life & fun · 13d ago · tanzaniaeducationproject.org
Turn a phone, tablet or TV into a sign. Type a message and it fills the screen: welcome signs, timers, Wi-Fi passwords and more. No app, no account, free.
Life & fun · 14d ago · bigwords.page
Play a free virtual guitar online with your keyboard or by touch. Slow songs down and see every chord, string and strum. Acoustic, classic, electric and bass.
Life & fun · 8d ago · guitoro.com
Carrier settings from iPhone, Pixel and Galaxy firmware, decoded and compared: APNs, VoLTE, 5G and Wi-Fi Calling per carrier, and what each build changed.
Life & fun · 12d ago · carrierexplode.com
Life & fun · 22d ago · space.bl2.net
Source: Show HN post ↗
Launched alongside, May 2018
the whole month →
Google Trends▲700A new experience to explore what the world is searching 🔎📈📊
Life & fun · 2018 · trends.google.com