API Explorer
Test REST APIs directly in your browser — send requests and inspect JSON responses with timing
Requests are sent directly from your browser using fetch(). The target API must allow CORS (Access-Control-Allow-Origin) for cross-origin requests to succeed. Public APIs like JSONPlaceholder work out of the box. Your data never touches our servers.
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Frequently Asked Questions
Enter the API URL, select the HTTP method (GET, POST, PUT, PATCH, DELETE), optionally add headers and a request body, then click Send. The tool uses your browser's fetch() API to make the request directly — no backend server is involved.
CORS (Cross-Origin Resource Sharing) errors occur when the API server doesn't include Access-Control-Allow-Origin headers in its response. This is a browser security feature. Public APIs like JSONPlaceholder allow CORS, but many private APIs don't. You may need to use a CORS proxy or test from a server-side environment.
No. All requests are sent directly from your browser to the target API using the fetch() API. Nothing passes through our servers. You can verify this in your browser's Network tab — you'll see the request going directly to the API endpoint.
Yes. Use the Auth tab to configure Bearer token, Basic authentication (username/password), or a custom API key header. The credentials are added to the request headers automatically and stay in your browser only.