What is the difference between this and Postman?+
This tool is a lightweight, browser-based HTTP client - no installation, no account, instant use. Postman has more features (environments, test scripts, collections, team sharing). Use this for quick API testing; use Postman for complex workflows.
How do I send a POST request with JSON body?+
Set method to POST, add Content-Type: application/json header, and paste your JSON in the body field. The tool sends the request and shows the full response.
Why am I getting a CORS error?+
CORS errors occur when the API server doesn't include the Access-Control-Allow-Origin header for browser-based requests. APIs that work in Postman (a native app) may block browser requests. Use a CORS proxy or test with curl instead.
Can I send file uploads?+
Yes. Set Content-Type to multipart/form-data and add a file field in the form data section. The file is encoded and sent as a multipart upload, the same as an HTML form submission.