Tool Guide

What is API Tester?

Lightweight HTTP client to send GET/POST requests, configure headers/body, and format responses.

How to use?

Configure Request: Enter URL, select method, set headers and body.
Send Request: Click execute to send the HTTP request.
Analyze Response: View returned JSON data in a formatted tree view.

Use Cases

API Integration

Quickly test API endpoints in the browser without launching heavy tools like Postman.

Limits and data handling

Success depends on the target address, network, and the target service's access rules.
Browser security rules can restrict some cross-origin requests and do not prove that the service itself is unavailable.
Do not enter real passwords, long-lived tokens, or customer data in headers or bodies.

The current browser sends the address, headers, and body. Enter only what is needed for testing and clear sensitive values afterward.

Frequently asked questions

Why was my request blocked by the browser?

Check the address and method, then confirm that the target permits requests from the current origin. A cross-origin block does not prove the API is down.

How do I test a request with parameters?

Fill query parameters, headers, and body as required by the endpoint, and use the matching Content-Type.

Can this replace production monitoring?

No. It is intended for quick integration checks and troubleshooting, not continuous monitoring.