About API Tester
Free online API testing tool. Send HTTP requests, view responses, manage headers, and track request history. Like Postman but in your browser.
Frequently Asked Questions
Is my API data secure?
Yes, all requests are made directly from your browser to the target API. Your data never passes through our servers. However, be cautious with sensitive credentials.
Why am I getting CORS errors?
CORS (Cross-Origin Resource Sharing) errors occur when an API does not allow requests from browsers. This is a server-side restriction. You may need to use a backend proxy or test with tools like Postman.
What HTTP methods are supported?
This tool supports GET, POST, PUT, PATCH, and DELETE methods. GET is for retrieving data, POST for creating, PUT/PATCH for updating, and DELETE for removing resources.
How do I add authentication?
Add an Authorization header with your token. For Bearer tokens: "Bearer your-token-here". For Basic auth: "Basic base64-encoded-credentials". API keys typically go in headers or query parameters.