API Tester Online Free

Key Features

Why Use an Online API Tester?

Testing APIs is a daily task for developers. While Postman is powerful, it requires installation and account creation. This browser-based tool lets you quickly test endpoints without any setup. It's perfect for quick checks during development, testing public APIs, verifying webhook endpoints, and demonstrating API behavior to teammates. The lightweight interface keeps you focused on the request and response without distractions.

Benefits

• •Test APIs without installing Postman or Insomnia
• •Quick endpoint verification during development
• •Test public APIs from any device with a browser
• •Verify webhook endpoints and API responses
• •Share API tests with teammates without tool setup
• •Lightweight alternative for simple API testing needs

How to Test an API

1. 1Select the HTTP method (GET, POST, PUT, etc.)
2. 2Enter the API endpoint URL
3. 3Add headers in the Headers tab (e.g. Authorization: Bearer token)
4. 4Add a JSON body in the Body tab for POST/PUT requests
5. 5Click 'Send' to make the request
6. 6View the response status, body, and timing below

Common API Testing Scenarios

Testing a GET endpoint: select GET, enter the URL, click Send. Testing authentication: add 'Authorization: Bearer your-token' in headers. Testing a POST endpoint: select POST, add Content-Type: application/json header, enter JSON body. Testing with query parameters: add them directly to the URL (e.g. ?page=1&limit=10). Handling CORS errors: the API server must allow browser requests — use a server-side proxy if needed.

Frequently Asked Questions

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