API Tester
Test HTTP REST API endpoints directly from your browser. Send custom HTTP requests, query parameters, header credentials, and raw JSON payloads. Bypasses browser CORS policy limitations.
CORS Helper Extension: DISCONNECTEDStandard fetch active. Requests to non-CORS APIs will fail. Install the extension to bypass.
Response Payload
Frequently Asked Questions
Does this API client support CORS requests?
Yes, but since it runs completely client-side in your browser, external API endpoints must return appropriate CORS (Cross-Origin Resource Sharing) headers to allow direct requests. Alternatively, you can use browser extensions to bypass CORS for testing local endpoints.
Is my API key or payload sent to any backend?
No. The requests are dispatched directly from your browser to the target API endpoint. No tracking, intermediate logging, or secondary proxies are used to capture your headers or request payloads.
Can I test local development servers?
Yes, you can test endpoints running locally on `localhost` or local network IP addresses (like `http://localhost:3000` or `http://127.0.0.1:8080`) directly from this browser utility.
Which HTTP methods are supported?
The API client supports all standard HTTP verbs, including GET, POST, PUT, DELETE, PATCH, HEAD, and OPTIONS, along with custom headers and payload bodies.