Browser-Based REST API Tester
Send a request directly from your browser and inspect its status, headers, and response body. Cross-origin APIs must allow browser CORS requests. It is aimed at frontend developers and API integrators who need to test an API endpoint before writing a client or curl script.
What is a REST API tester?
A REST API tester is an HTTP client for trying endpoints without writing a separate script. It helps inspect methods, request headers, JSON bodies, status codes, and response payloads during development.
How to use this API tester
Choose a method, enter an endpoint URL, add JSON headers and an optional request body, then select Send request. The response panel displays the status, returned headers, and formatted JSON when the server returns JSON.
Browser CORS limitations
This tool makes requests directly from your browser. An API must send appropriate CORS headers or the browser will block the response. That restriction cannot be bypassed by client-side code.
How to use REST API Tester for related tasks
Choose the HTTP method, add request headers and a body, send the request, and check the status, response headers, and formatted payload.
Related tools: cURL to Code Converter, Query String Parser.
Frequently asked questions
Are requests sent through DevStackKit servers?
No. The browser sends the request directly to the URL you enter. DevStackKit does not proxy, log, or store requests.
Why might a request fail because of CORS?
Browsers block cross-origin requests unless the destination explicitly allows your origin with CORS response headers. This is a browser security rule, not a server-side error in this tool.
Should I send real API keys here?
Use test credentials only. Requests run in your browser, but browser history, extensions, network logs, or the destination service may still expose sensitive values.
Why did my API request fail in the browser?
A network error often means the endpoint does not allow browser CORS requests; the API must explicitly permit the requesting origin.