Requestly - Free API Testing & Mocking Tool

🚀 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

Requestly doesn’t set up a proxy in your browser, and hence, developers don’t face VPN issues or lags while using it. Requestly leverages Chrome Extension APIs under the hood to hit API endpoints and intercept & modify requests.

======== Top Features ========

👉 Beautiful & Privacy-Friendly API Client → Test API Responses → API Collections → Environments (Variables & Secrets) → Pre-Request & Post-Response Scripts → Team Workspaces 📌 Demo Video – https://www.youtube.com/watch?v=xrqmAffe86k

👉 Mock XHR & Fetch API requests (Stub API Responses or API Mocking) → Helps in building frontend faster when backend (or APIs) don't exist → Define Custom API Responses triggered by XHR/fetch → Modify/Override API responses → Mock GraphQL API responses → Simulate fake HTTP Status Code (400s or 500s) 📌 Demo Video – https://www.youtube.com/watch?v=KIPbxUGUYq8

👉 HTTP Interceptor Features → HTTP Redirects (API or JS Redirects from one env to another) → Swap Host/Domain of HTTP Requests → Modify HTTP Request & Response Headers → Override XHR Request Body & Response Body → Insert Scripts → Block Network Requests → Add/Simulate Delay in HTTP Requests 📌 Demo Video – https://www.youtube.com/watch?v=vfcGy2666us

======== HTTP Interceptor Features & their Use-Cases ========

👉 Redirect URLs, Change Host, Modify Query Params (Map Remote or Map Local) → Use dev/staging APIs in production sites & test local changes without code changes → Debug remote Javascript by loading locally running JS in production sites → Switch Hosts (e.g. abc.com/* to xyz.com/*) using Replace Rule → Debug Ad Tracking Pixels, Debug A/B Test Campaigns, etc → Remote Debugging with Requestly on Production sites → Swap Adobe Launch (Adobe DTM) scripts in production with staging script 📌 Demo Video -- https://www.youtube.com/watch?v=85GVaOWTnlE

👉 Insert Scripts to any Webpage → UserScripts are simple JavaScript/CSS code that can change the layout of a page, add or remove new functionality and content, or automate actions. → Use File Server to upload long scripts and Inject them using Script Rule → Inject your JS tags on potential customers' sites and test your features → The sales/product team can use this to demo the product directly on the prospect’s website (10x engaging demo) 📌 Demo -- https://www.youtube.com/watch?v=4dvucRjLwGY

👉 Cloud-based API Mock Server → Create API Mocks → Generate Mock data (random data) in the API response → Test Mock API endpoints using API client → Add delay to the API Mocks → Define custom HTTP status code & custom headers in the API Mock → CORS enabled. The mock endpoints work seamlessly without CORS errors. 📌 https://app.requestly.io/mocks

👉 Session Recording → Visual Bug Reporting Tool → Cut down your bug reporting time & debugging time → Automatically capture browsing video, Console logs, Network logs & env details → Get quality bug reports from QAs, Customer Support & other non-technical people → Easily Share Har files 📌 Demo Video – https://www.youtube.com/watch?v=g_qXQAzUQgU

👉 Additional Features → Enable/Disable rules with a single click → Export and import the rules and maintain a backup for your rules → Easy collaboration with others. Share Rules with other Users in one click 📌 Demo -- https://www.youtube.com/watch?v=BM7kTFy-vdc

======== References ======= 🏡 Website - https://requestly.com 📖 Docs - https://developers.requestly.com 🥷 Github - https://github.com/requestly/requestly 💻 Desktop App - https://requestly.com/desktop 📳 Issues - https://github.com/requestly/requestly/issues 🔓Privacy - https://requestly.com/privacy