API Tester – Online REST Client
Test REST APIs directly in your browser. Send HTTP requests with custom headers, body, and auth — view status, response body, and headers instantly.
API Tester – Online REST Client
The API Tester is a lightweight Postman alternative that runs entirely in your browser. Send HTTP requests to any public API and inspect the response status, body, headers, response time, and size.
Features
- All HTTP methods: GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS
- Custom request headers as key-value pairs
- Request body: JSON, form-encoded, or raw text
- Authentication: Bearer token or HTTP Basic Auth
- Response time and size metrics
- Pretty-printed JSON response body
Security
All requests are proxied through a server-side route. Requests to private IP ranges (10.x, 192.168.x, 172.16-31.x), localhost, and non-HTTP(S) protocols are blocked to prevent SSRF attacks.