Free Online API Tester
Send HTTP requests and inspect responses — free online REST API tester
Frequently Asked Questions
What is an API tester?
An API tester lets you send HTTP requests (GET, POST, PUT, DELETE) to any URL and view the response including status code, headers, and body. It is an essential tool for developers building and debugging REST APIs.
Is this API tester free?
Yes, this tool is completely free with no registration required. All requests are made directly from your browser.
Can I send POST requests with a body?
Yes, you can add a JSON request body and custom headers for POST, PUT, and PATCH requests. Select the method and fill in the body field.
How to Use
- Check validation messages for issues
- Paste your code or data into the input
- Click Process or press Ctrl+Enter
- Review output with syntax highlighting
FAQ
Does it support large files?
Handles reasonably large inputs. Files over 10MB may take a few seconds depending on your device.
What browsers are supported?
All modern browsers: Chrome, Firefox, Safari, Edge. Some features need recent versions.
Which standards does it follow?
Follows the latest official specifications — RFC, W3C, or ECMA as applicable.
Is the output production-ready?
Yes, generates clean, standards-compliant output suitable for production use.
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