API Tester

This tool generates curl commands for you to run in your terminal. Direct API testing is planned.

Bearer tokens, API keys, and Basic Auth headers can be added.

API Tester is a free online developer tool that allows you to perform generate curl commands and api test requests for common http methods and endpoints. It runs entirely in your browser, so your data stays private and secure.

Yes, API Tester is completely free to use with no hidden charges, premium tiers, or usage limits. You can use it as many times as you need without paying anything.

No account or sign-up is required. You can start using API Tester instantly without providing any personal information. We believe in making tools accessible to everyone.

Absolutely. API Tester processes everything locally in your browser. Your files, text, and data never leave your device. We do not upload, store, or access your content. Once you close the tab, everything is permanently deleted.

Yes. ToolKitHub is fully responsive and works on smartphones, tablets, and desktops. API Tester adapts to your screen size for a smooth experience on any device with a modern browser.

API Tester supports standard developer formats commonly used in professional workflows. For specific format compatibility, refer to the in-tool instructions provided on the tool page.

There is no server-side file size limit. The only constraint is your browser's available memory. Most files up to 100MB work well. Very large files may take longer to process.

Since processing happens locally in your browser, API Tester is extremely fast for most operations. Performance depends on your device's processing power and available memory.

You need an internet connection to load the tool page initially. Once loaded, some processing happens locally and may continue without connectivity depending on the specific tool requirements.

API Tester offers the convenience of instant access without installation. While it may lack some advanced features of professional desktop software, it covers the most common use cases with the benefit of being free and accessible from any device.