Online REST API Tester & HTTP Client

Send HTTP requests (GET, POST, PUT, DELETE, PATCH), set headers and body payloads, and inspect JSON responses directly from your browser.

⚡ In-Browser HTTP Client
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In-Browser REST API Client for Fast Debugging

Debug webhook endpoints, test third-party REST APIs, inspect response JSON payloads, and verify status responses without having to install desktop applications like Postman or Insomnia. Note: APIs must allow Cross-Origin Resource Sharing (CORS) for direct browser requests.

Frequently asked questions

What does REST API Tester do?

Online Postman alternative. Test REST APIs with GET, POST, PUT, DELETE, custom headers, and payloads with instant response code inspection. 100% in browser.

How does REST API Tester work?

Debug webhook endpoints, test third-party REST APIs, inspect response JSON payloads, and verify status responses without having to install desktop applications like Postman or Insomnia. Note: APIs must allow Cross-Origin Resource Sharing (CORS) for direct browser requests.

Where can I find tools related to REST API Tester?

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About the author

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We maintain this developer & code tool and its usage guide.