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API Tester

Test API endpoints with full HTTP method support, custom headers, and request body

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About This Tool

The API Tester is a browser-based tool for testing and debugging API endpoints. It supports GET, POST, PUT, PATCH, and DELETE methods with custom headers, JSON/form-data/plain text request bodies, and automatic JSON response formatting. All requests are sent directly from your browser with no data passing through any intermediary server.

Key Features

Quick Preview

Use Cases

api http rest testing

Frequently Asked Questions

What HTTP methods does the API Tester support?

The API Tester supports GET, POST, PUT, PATCH, and DELETE methods. You can select the method from the dropdown and configure the request body and headers accordingly for each method.

Can I add custom headers to my requests?

Yes, you can add any number of custom headers using the Headers tab. A default Content-Type header is pre-filled, and you can add more headers or remove existing ones with the Add Header and delete buttons.

What request body formats are supported?

The tool supports three body formats: JSON, Plain Text, and Form Data. You can switch between them using the radio buttons in the Body tab. JSON is selected by default with auto-formatting in the response viewer.

Does the API Tester store my request history?

Yes, the tool saves your recent requests to localStorage so you can quickly re-execute them. You can view your request history in the bottom section and click any entry to reload the method and URL.

Is my API data sent through any intermediary server?

No. The API Tester sends requests directly from your browser to the target URL using the Fetch API. No data passes through any intermediary server, and your request history is stored only in your browser's localStorage.