Modify & Mock
API Responses
in Real-Time
- Validate edge cases
- Stress-test applications
- Simulate backend responses
- Bypass backend complexities
- Mock Third-Party API Responses
Requestly works on Desktop only
Requestly is a web proxy that requires a desktop and desktop browser.
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Trusted by 200k+ developers at →
Your Development Companion
Gain comprehensive control over API responses for testing edge cases and accelerating frontend development.
Build frontend when the backend isn’t ready
Use the Modify Response rule to create mock APIs with custom responses and status codes. Easily disable these mocks when actual APIs become available.
Test for Edge/Corner Cases
Simulate diverse API edge cases (e.g., missing parameters, null values, incorrect data types) without modifying the backend. This ensures robust error handling in your code.
GraphQL Support
GraphQL’s single-endpoint design can hinder targeted API modification. Requestly solves this with operation name filters, enabling precise response manipulation in GraphQL environments – just as you’d expect with REST APIs.
Collaboration & 1-Click Sharing
Promote consistency and accelerate development by sharing Requestly rules within your team. Choose between shared workspaces for real-time collaboration or targeted sharing with individual members.
Async /Await Support
When faced with lengthy API calls or the need to manage multiple requests simultaneously, using an asynchronous approach with Async/Await can significantly improve efficiency.
More HTTP Request & Response Manipulation Rules
These HTTP Rules designed for all your local development and testing needs.
Redirect Rule
Redirect a matching pattern to another URL.
Cancel Rule
Block URLs by specifying keywords or complete URL.
Replace String
Replace part of URL like hostname, query values.
Modify Headers
Modify HTTP request & response headers.
Query Params
Add or Remove Query Parameters
Insert Script
Inject Custom JS & CSS on any website(s).
Delay Network
Simulate delay in response of API calls.
Modify Request Body
Modify body of POST requests.
Popular Case Studies
Learn from real-world examples, See how others integrate Requestly into their workflows by exploring our case studies.
Additional Features of Requestly
Mock Server
- Easy-to-use GUI, no command line.
- Mock Third Party APIs
- Faster than CLI-based tools.
- Various Import Options.
Session Book
- 1 Click Bug Report – Record screen with cursor, console logs, network logs & environment details.
- Debug 10x Faster – Use recorded screen, cusror movement, console logs, network logs & environment details to debug Faster.
For the developers, by the developers ❤️
We are using this extension in my current company as frontend developers to modify API responses and it works very very well. Highly recommend it.
Requestly’s browser extension is remarkably easy to use. As a full-stack developer, I often need to test data-intensive UI for edge cases and performance. Using Requestly I can do it very easily by mocking network requests, without needing code changes or database seeding.
Great tool for frontend developers and QA tester for API response, redirects, mock data and much more. Requestly removes the dependency on waiting for backend API’s. Really useful to have in your frontend development environment.
Requestly is an incredibly useful tool for developers working on a large team with multiple staging envs, or numerous app endpoints for various APIs in a local environment. The Sessions feature is especially useful for documenting solutions or sharing with others since it captures the relevant network traffic, and screen recording enables others to easily reproduce. Requestly combines all the power of complicated tools like Charles Proxy and Postman in one app/chrome extension. I highly recommend giving it a try if you haven’t already–it will make your dev work so much easier. (Summarized)
Modifying requests and/or responses is the killer feature area for me. Redirect JS in prod, generate mocks, modify headers, map local, map remote, SessionReplay, Load a local JS bundle, override scripts, etc. etc. etc. – TOTALLY worth it and very useful.
Requestly is awesome. I used to use Charles proxy in my day-to-day work but it always messed with my wifi. I haven’t had any issues with Requestly. Requestly’s UI is an amazing tool and great to work in.
Requestly not just made it easier for us to develop, test & debug our code on our customer sites but also helped us do engaging product demos to our prospective clients.
I’m a big fan of Requestly, and use it on a daily basis as a QA Engineer. It removes the need to use Charles Proxy often, which is always nice. I can just use Requestly directly in Chrome
Awesome tool. I use it almost daily for my projects to modify request body, headers, etc. Would recommend it to every frontend developer out there. Thank me later 🙂 (Case Study)
This is by far the best tool for managing request headers! Plus the developers are very active meaning you’ll get help if you’re ever stuck or need help solving a problem. I use it daily and couldn’t be happier.
App works as expected! Ran into some small issues while creating the rules but the support team was able to help and overcome those.
Requestly is user-friendly, brilliant and easy-to-use. I use it on an daily basis and it makes my work easier. After using other tools like Charles – Requestly is a nice new breath of air that I highly vouch for. Apart from the tool being amazing – the support from the Requestly team is phenomenal with them always going above and beyond for their clients.
