Requestly - Free API Testing & Mocking Tool

Open-Source API Client & HTTP Interceptor. API Collections, Environments, JS Redirects, API Mocks, Modify Headers and Insert Scripts

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Requestly - Free API Testing & Mocking Tool

Requestly - Free API Testing & Mocking Tool is an open-source Chrome extension designed to assist developers in testing and mocking API requests. With a stylish UI, it offers features like an API client, HTTP interceptor, and the ability to mock API responses, making it ideal for seamless frontend development. Trusted by over 200,000 developers, Requestly streamlines collaboration and testing with capabilities such as modifying headers, inserting scripts, and generating mock data.

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Extension stats

By: https://requestly.com

Users: 200,000+

Rating: 4.33

(1,236)

Version: 24.11.25 (Last updated: 2024-12-30)

Creation date: 2020-06-02

Risk impact: High risk impact

Risk likelihood:

Very low risk likelihood

Manifest version: 3

Permissions:

contextMenus
declarativeNetRequest
proxy
scripting
storage
tabs
unlimitedStorage
webNavigation
webRequest

Host permissions:

<all_urls>

Size: 898.05K

Email: co*****@requestly.io

URLs: Website ,Privacy policy

Ranking

# 1,297 ▼ 5

Other rankings

#22 in Developer Tools

#8 in mock keyword 45 ▲ 2

#10 in modify keyword 86 ▲ 1

#10 in request keyword 13

#25 in override keyword 35

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Other platforms

Not available on Android

Not available on Firefox

Requestly - Intercept, Modify & Mock HTTP Requests (v24.5.8)

4.10

(14) 14,378+

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Extension summary

Analyze keywords

🚀 Best Chrome extension to Test & Mock API Requests. Trusted by 200,000+ developers.

👉 Requestly works directly in Chrome with beautiful, modern UI and team collaboration features. Popular features - API Client, API Mocking & HTTP Interceptor.

⭐️ Open Source - https://github.com/requestly/requestly/

🌟 Top Use Cases → A beautiful & privacy-friendly API-Client (Full LocalStorage Support) → Mock API Responses to build frontend when backend isn't ready → Test local JavaScript changes directly on production site. → Use HTTP Redirect Rule to load scripts from local or staging environments on production sites. → Modify and Mock API Request payload, Response body, & Status Code. → Override GraphQL Requests 📌 https://requestly.com/blog/what-is-requestly

User reviews

These summaries are automatically generated weekly using AI based on recent user reviews. Chrome Web Store does not verify user reviews, so some user reviews may be inaccurate, spammy, or outdated.

Pros

Seamless integration with existing tools like Postman
User-friendly interface and intuitive for developers
Excellent support and quick response from the team
Highly effective for mocking APIs and intercepting requests
Continuous improvements and responsiveness to user feedback

Cons

Requires a login to use the extension.
Monthly fee is required for certain features, which wasn't clearly communicated
Some users experienced issues with the app not opening or being functional without a login.
Initial setup may cause confusion for new users.

Most mentioned

API Client feature is a major highlight and a replacement for Postman
Outstanding customer support and quick responses
Ability to mock and modify API requests is crucial for development
Easy transition from other tools with quick import and sync of Postman collections
User-friendly interface with intuitive controls for modifying requests

User reviews

Badzian Sapraŭdny, 2025-01-10

We have been using Requestly for HTTP Rules and Network inspector capabilities, which works great. We recently migrated from Postman to API Clients capability of Requestly. # Seamless migration for our 100+ postman collections / environments in single click. # Great support and diligence from team in building required features and incorporating feedback.

Harry S, 2025-01-09

I’ve found Requestly to be an invaluable Chrome extension for development. It allows me to mock APIs, intercept requests, and test frontend changes even when the backend isn’t ready. The ability to modify headers, simulate delays, and inject scripts has made debugging and collaborating so much easier

Kuldeep Soni, 2024-12-26

View all user reviews

Extension safety

Risk impact

Requestly - Free API Testing & Mocking Tool requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.