A no-login browser tool to test any public API — inspect headers, preview JSON/images/audio/PDF responses, and auto-generate code in 6 languages.
- No login, no install — runs entirely in the browser as a single HTML file
- All HTTP methods — GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS
- Request builder — headers, query params, body (JSON/Form/Text/XML), auth (Bearer, Basic, API Key)
- Smart response viewer — auto-detects content type and renders accordingly:
JSON→ syntax-highlighted with color-coded keys, strings, numbersImages→ inline preview with pixel dimensionsAudio→ playable audio playerVideo→ inline video playerPDF→ embedded PDF viewerHTML→ sandboxed iframe preview + source toggleBinary→ download button
- Code generator — auto-generates ready-to-run code for:
- cURL · JavaScript Fetch · Axios · Python · Go · PHP
- Request history — last 50 requests, reload any with one click
- Preset APIs — JSONPlaceholder, Cat Fact, Joke API, IP lookup, Country Info, Open-Meteo Weather, and more
No setup required. Just open index.html in any modern browser — or visit the live demo above.
1. Enter a URL
2. Set method, headers, params, body, or auth as needed
3. Click ▶ Send
4. Inspect the response or copy the generated code
git clone https://github.com/theshanbmr/api-playground.git
cd api-playground
open index.html # or just double-click itNo build step. No dependencies. No Node.js required.
Some APIs block browser requests due to CORS policy. When this happens, the Code Gen tab still generates working code you can run from a terminal or backend.
| What | How |
|---|---|
| Framework | None — vanilla HTML/CSS/JS |
| Fonts | JetBrains Mono + Syne (Google Fonts) |
| Build tool | None |
| Dependencies | Zero |
| File count | 1 |
MIT — do whatever you want with it.