API Tester - Online API Request Tool
Test your API endpoints directly from your browser. Send GET, POST, PUT, DELETE requests with custom headers and body, and view the response.
API Request
API Response
About the API Tester
The API Tester is a convenient online tool for developers and testers to quickly send HTTP requests to any API endpoint and inspect the responses. It supports various HTTP methods and allows for custom headers and request bodies.
How to Use
Enter the API URL, select the HTTP method, add any necessary headers (in JSON format), and provide a request body (also in JSON format) if applicable. Click 'Send Request' to execute the call and view the status, headers, and body of the API's response.
Frequently Asked Questions
Is this tool secure for sensitive API calls?
This tool runs entirely in your browser using JavaScript. While it doesn't store your data, for highly sensitive production API calls, it's always recommended to use dedicated API testing software or your local development environment.
What kind of APIs can I test?
You can test any RESTful API endpoint that is publicly accessible or accessible from your browser due to CORS policies. For APIs requiring authentication, you can include authentication headers.
How are CORS issues handled?
CORS (Cross-Origin Resource Sharing) is a browser security feature. If the API you are testing does not allow requests from 'flattools.com', your browser will block the request, and you will see a CORS error in your browser's developer console. This tool cannot bypass CORS restrictions.