Eric Harper - Requestly API Client

A lightweight and secure API Client for faster API Development & Testing

API Collections

Local & Team Workspaces

Import from Postman & Bruno

HTTP Interceptor

A Powerful HTTP Interceptor to Intercept, Record, Debug & Modify HTTP Requests

Replace Rule (Switch Domain)

Modify API Response

Modify Request Body

Modify HTTP Headers

Insert Custom Scripts

Modify Query Param

Cross Device Testing

Block Network Requests

Build frontend faster without waiting for backend.

Modify API responses

Modify API request body

Modify HTTP Status Code

Create Mock Endpoints

Supports GraphQL API Overrides

Frontend Web/Mobile Developers

Requestly improves front-end workflows with local JS testing, mocking, and SessionBook debugging.

For QA engineers

QA engineers love Requestly for its features and ease of use, allowing easy edge case testing.

Support Engineer

Support engineers value Requestly for debugging, demoing, and overriding GTM and Adobe scripts.

Backend Developers

Requestly helps in improving back-end development workflows, by enabling testing.

Requestly vs Postman

Student Programme

Download

Requestly Works on Desktop Only

Requestly is a web proxy that requires a desktop and desktop browser.
Enter your email below to receive the download link. Give it a try next time youâ€™re on your PC!

Chrome extension

Lightweight & Efficient, installs with 1 click. Suitable for working with Web Based Applications.

More browsers ->

Mac app

Suitable for working with Mobile or Desktop Based Applications. 1-Click interception for Android & iOS Simulators.

Download For Mac

More platforms ->

A lightweight and secure API Client for faster API Development & Testing

API Collections

Local & Team Workspaces

Import from Postman & Bruno

HTTP Interceptor

A Powerful HTTP Interceptor to Intercept, Record, Debug & Modify HTTP Requests

Replace Rule (Switch Domain)

Modify API Response

Modify Request Body

Modify HTTP Headers

Insert Custom Scripts

Modify Query Param

Cross Device Testing

Block Network Requests

Build frontend faster without waiting for backend.

Modify API responses

Modify API request body

Modify HTTP Status Code

Create Mock Endpoints

Supports GraphQL API Overrides

Student Programme

📣 Requestly API Client – Free Forever & Open Source. A powerful alternative to Postman. Try now ->

Requestly is an invaluable tool that helps us test, validate, and troubleshoot our features and client integrations.

Open-Source API Mocking & Testing Tool

Copyright © 2025 BrowserStack, Inc. All rights reserved.

Features

Redirect URL Replace Rule Modify API Response Modify Headers Insert Scripts Modify Query Param Cross Device Test GraphQL APIs

Resources

Pricing Blog Use Cases Academy Privacy Policy Terms of Service Refunds and Cancellations

Company

About Us Contact Us Careers Press EULA Community Guidelines

Compliance

SOC2 DPA GDPR Great Place

Developers

Release notes Report issues GraphQL support OSS friends Github Join Community

Get Requestly

Compliance & accreditations

Compare Requestly with

Charles Proxy Wireshark Insomnia

Modheader Fiddler Bruno

Proxyman Mockoon

HTTP Toolkit Postman

Resource Override Hoppscotch

How to Guides

Redirect Your Local Ad Server to Production for 2x Faster Development

Block a header bidding script on websites to isolate testing of other scripts.

Easily Test your Local RTB Scripts on Production Without Deploying

Simplify Demos by Directly Testing Ads on Client Websites

How to Simulate Different Devices Using User-Agent

Test How Your System Handles Geo-Targeting Information

A/B test bundles on production to evaluate their performance.

Case Studies

How Blockthrough uses Requestly to seamlessly test their JS on publisher websites

Breaking Hardware Testing Barriers: Plume’s Journey with Requestly’s API Mocking

From hours to minutes: Stay22’s Journey to Faster Script Deployment with Requestly

Optimizing Ad Delivery with Requestly : Adpushup’s Story