Question 1

What is an API tester?

Accepted Answer

An API tester is a tool that lets you send HTTP requests (GET, POST, PUT, PATCH, DELETE) to API endpoints and inspect the responses. QTool.io's API Tester runs entirely in your browser with custom headers, JSON body support, and request history.

Question 2

Why do some APIs not work with this tool?

Accepted Answer

This tool runs in your browser, so it is subject to CORS (Cross-Origin Resource Sharing) restrictions. APIs that do not send CORS headers will be blocked by the browser. Most public APIs support CORS, but some private APIs may not.

Question 3

Can I import and export cURL commands?

Accepted Answer

Yes, you can paste a cURL command to automatically fill in the method, URL, headers, and body. You can also export your current request as a cURL command to use in your terminal.

Question 4

Is request history saved?

Accepted Answer

Yes, QTool.io's API Tester saves your last 50 requests in your browser's local storage. You can reload any previous request with one click, or clear your history at any time.

Free API Tester & HTTP Client

Need something more powerful?

QTool.io on GitHub