What is an API Tester?
An API (Application Programming Interface) Tester is a tool that allows developers to send HTTP requests to servers and view their responses. It simulates the behavior of a frontend application or a backend service communicating with an API.
Our web-based API tester lets you send standard requests (GET, POST, PUT, DELETE, PATCH) right from your browser, making it incredibly fast to verify endpoint functionality.
Important Note on CORS
Because this tool runs inside your browser via the Fetch API, it is subject to Cross-Origin Resource Sharing (CORS) policies.
If you attempt to request an API that does not explicitly allow your browser to fetch it from our domain, the browser will block the request for security reasons. To test such APIs, you will need a dedicated desktop client like Postman or Insomnia, or you must enable CORS on your backend server during local development.
Supported Methods
- GET: Retrieve data from the server.
- POST: Send new data to the server (requires a body).
- PUT: Replace existing data on the server.
- PATCH: Partially update existing data.
- DELETE: Remove data from the server.