About the API Endpoint Tester
Quickly testing an API endpoint or verifying a webhook URL shouldn't require opening a heavy desktop client. This API Endpoint Tester provides a lightweight, in-browser REST client to dispatch HTTP requests, measure response latency in milliseconds, inspect HTTP status codes, and view formatted JSON responses.
This tool is designed for developers debugging web services, verifying public APIs, testing CORS configurations, and inspecting payload structures. It supports GET, POST, PUT, DELETE, and PATCH methods with custom headers and request bodies.
To use it, enter your endpoint URL, choose the HTTP method, add any required JSON headers or body, and click 'Send HTTP Request'. The response status badge, round-trip latency, and formatted response body appear immediately below.
For example, sending a GET request to a public API returns status '200 OK', latency in milliseconds, and pretty-printed JSON ready to copy.
Important note on CORS: Web browsers enforce Cross-Origin Resource Sharing (CORS) security restrictions. If the target API does not include 'Access-Control-Allow-Origin' headers permitting browser requests, the browser will block the response. This is a browser security standard, not a tool limitation.
Tip: Use this tool to verify that your backend endpoints return correct CORS headers for frontend web applications.