Modify & Mock
API Responses

in Real-Time

4.8 ⭐ 1,200+ Ratings, 200,000+ users

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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.

    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.

    Additional Features of Requestly

    for frontend & QA teams

    Mock Server

    • Easy-to-use GUI, no command line.
    • Mock Third Party APIs
    • Faster than CLI-based tools.
    • Various Import Options.
    Read More

    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.
    Read More

    API Client

    • Simple in-browser API Client
    • Test Your APIs
    • Test API Overrides
    Read More

    For the developers, by the developers ❤️

    From Debug to Deploy: Developers Trust Requestly

    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.

    Divyanshu Sharma
    Full-stack Developer at ShortLoop

    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.

    Samroon Michael
    Senior Frontend Developer at Mudah.my

    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)

    Joél Hawkins Torres
    Senior Software Engineer at Autodesk

    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.

    Carl Hand
    Senior Software Engineer at Workday

    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.

    Michael Levinson
    Co-Founder & CPO at Joyned

    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

    Mike Mitchell
    QA Engineer at URBN

    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)

    Harsh Vats
    Frontend Engineer at PingSafe

    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.

    Jose Browne
    Senior Engineer at Reddit

    App works as expected! Ran into some small issues while creating the rules but the support team was able to help and overcome those.

    José Miguel Dias Fernandes
    Development Lead at Vodafone

    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.

    Marius Ludick
    Solutions Architect II at Amazon

    Requestly is an amazing tool to get your development work less hassle. The product itself has evolved so much since day-1 and the company is really serious on helping their customer solves their problems. We had this nice session where they shared Requestly features and we were very impressed on its potential. A truly 5-star worthy.

    Natchapol Thongruang
    Senior Software Engineer at Agoda

    Just loved the way Requestly saved several person hours for our dev team by allowing us to redirect and intercept requests. The simple yet efficient rules allowed us to seamlessly redirect requests from a single staging front-end server to local backend servers. This meant that our devs didn’t need to build or run the front-end server locally when focusing on backend tasks.

    Srijan Bhatnagar
    Senior Software Engineer at Atlassian