Online API tester: GET/POST/PUT/DELETE/PATCH with custom Headers/Body, 30s timeout with cancel. Postman alternative.
TL;DR: Free online HTTP API tester supporting GET, POST, PUT, DELETE, and PATCH. Custom Headers and Body, 30s timeout with cancel. A simplified Postman alternative, runs locally.
This tool runs entirely in your browser. Open DevTools → Network panel and search your input — it appears in no request.
FAQ
Completely free, no registration required. Send HTTP requests to test APIs directly in your browser — a free Postman alternative with no usage limits.
It supports GET, POST, PUT, DELETE, and PATCH — five common HTTP methods — with custom request Headers and Body for REST API testing.
The tool has a 30-second default timeout with the ability to cancel requests at any time. Responses are auto-formatted for easy viewing of JSON and other formats.
Yes by default: requests are forwarded through this site's server-side proxy so you can test third-party APIs without CORS or mixed-content blocks. Turn off "Server-side proxy" in Settings to send from the browser directly (the target must then allow CORS).
Related Tools
Related Articles
API Testing: How to Send a Token and Fix CORS Errors
How to add an Authorization token when testing APIs online, and what to do about CORS / 405 / timeout errors? A step-by-step troubleshooting guide with our API tester.
Complete Guide to HTTP API Testing: From Basics to Advanced Debugging Techniques
Master the core skills of HTTP API testing, including GET/POST/PUT/DELETE requests, header configuration, request body formats, authentication methods, and debugging techniques. Boost your development efficiency with an online API testing tool.
AES Encryption in the Browser: A Practical Guide to Web Crypto API
Learn AES encryption in JavaScript using the Web Crypto API. Complete AES-256-GCM encrypt/decrypt example with PBKDF2 key derivation, all running client-side.