Professional API Tester Online

An API tester is a tool that allows developers to send HTTP requests to API endpoints and analyze the responses. It works by configuring request parameters (method, URL, headers, body) and sending them to the target API, then displaying the response data, status codes, and performance metrics.

Our API tester supports all standard HTTP methods including GET, POST, PUT, PATCH, DELETE, HEAD, and OPTIONS. You can easily switch between methods using the dropdown selector.

Yes, you can add unlimited custom headers to your API requests. This includes authentication headers (like Authorization, API-Key), content-type headers, and any other custom headers required by your API.

Yes, our API tester is completely free to use. There are no registration requirements, usage limits, or hidden fees. All processing is done in your browser for privacy and security.

To test POST requests with JSON data: 1) Select POST method, 2) Enter your API URL, 3) Add Content-Type: application/json header, 4) Enter your JSON data in the Body tab, 5) Click Send Request. The tool will display the response with proper formatting.

Yes, you can copy responses to clipboard or download them as JSON files. Use the Copy button to copy formatted response data or Download button to save the response as a file.

The API response shows: HTTP status code and message, response time in milliseconds, response headers, formatted response body (JSON, XML, or text), and color-coded status indicators for quick analysis.

Yes, all API requests are made directly from your browser to the target API. No data passes through our servers, ensuring your API keys, request data, and responses remain private and secure.

Absolutely! You can save unlimited API requests to your browser's local storage. Use the Export button to download all your saved requests as a JSON file, which you can share with team members or import on another device. Collections include requests, variables, and cookies for complete portability.

We support several productivity-boosting keyboard shortcuts: Ctrl+Enter (or Cmd+Enter on Mac) to send requests instantly, Ctrl+S to save the current request, Ctrl+K to focus the URL input, Ctrl+/ to toggle the variables panel, and Esc to clear the response. Click the keyboard icon in the toolbar to see all available shortcuts.

Our cookie manager automatically captures cookies from API responses and includes them in subsequent requests, making it perfect for testing session-based APIs. You can also manually add, edit, or remove cookies in the Cookies tab. All cookies are stored locally in your browser and persist across sessions until you clear them.