API-Spielplatz

Anyone who works with APIs knows the ritual: hit the endpoint, set the headers, craft the body, check the response. Most people reach for a heavyweight desktop app for this. The API Playground brings exactly that bench into the browser - no installation, no forced account for a quick test, no syncing your requests to someone else’s cloud.

You choose the HTTP method - GET, POST, PUT, PATCH, DELETE or HEAD - enter the URL, set arbitrary headers as key-value pairs and, for writing methods, a request body. One click and the request goes out. The response comes back structured: the status code colour-coded by success, redirect or error, the response time in milliseconds, the size in bytes, kilobytes or megabytes, plus body and headers in separate tabs.

The key trick is the server-side proxy. Requests do not run directly from your browser but through the server - which bypasses the CORS restrictions that otherwise doom in-browser tests. So you can hit endpoints that set no cross-origin headers and get the real response instead of a browser error.

JSON responses are detected automatically and rendered nicely formatted so you can read nested structures at once. The header view shows all response headers, which is gold when debugging content type, caching, authentication or rate limiting.

Your recent requests land automatically in a history stored locally in your browser - up to 50 entries with method, URL, ordinary headers and the resulting status. Credentials such as Authorization, cookies and API keys, and request bodies, are only kept while the window is open; they are never stored. One click pulls an old request back into the form so you can iterate without retyping everything.

The API Playground is a tool for developers, for everyone who debugs webhooks, builds integrations or simply wants to understand what an endpoint returns. It pairs perfectly with the Mock Server when you want to simulate endpoints yourself, and with Scripts when you want to process responses further.