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API Tester - Test REST API Endpoints Online

Free online REST API testing tool. Send HTTP requests with custom headers and body, view responses with formatting.

Note: Due to CORS restrictions, this tool can only test APIs that allow cross-origin requests from this domain. Many public APIs work fine.
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How to Use API Tester

  1. Enter your input or configuration in the API Tester
  2. Set up test parameters and options as needed
  3. Click Test or Run to execute the test
  4. Review the results and output details

Common Use Cases

  • Testing REST API endpoints directly in the browser
  • Debugging API responses with custom headers and body
  • Sending HTTP requests without Postman or cURL
  • Quick API testing during frontend development

Frequently Asked Questions

Is API Tester free to use?
Yes, API Tester is completely free with no signup required. You can use it as many times as you need.
Is my data safe when using API Tester?
Absolutely. All processing happens directly in your browser. Your data is never sent to any server or stored anywhere.
Do I need to install anything?
No installation is needed. API Tester runs entirely in your browser and is ready to use immediately.
Can I save or share test results?
You can copy the results from the output area. All testing happens locally in your browser for maximum privacy.
Are there any rate limits?
No, since processing happens in your browser, there are no rate limits or usage restrictions.

๐Ÿ’ฌ User Feedback

Have suggestions or found a bug? Leave a message and we'll get back to you.
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