Every developer needs to test APIs. Postman is great but heavy. Online alternatives want signups.
So I built API Tester — a free, instant HTTP client in your browser.
What It Does
- Send GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS requests
- Add custom headers (auth tokens, content-type, anything)
- Send JSON request bodies
- See response status, headers, timing, and body size
- Auto-formats JSON responses
- No signup. No download. No extensions.
How It Works
The tool runs a server-side proxy to avoid CORS issues — your request goes through our API route which forwards it to the target URL and returns the full response including headers and timing.
This means you can test any API endpoint, even ones that block browser requests.
Try It
- Pick your HTTP method
- Enter the URL
- Add headers if needed
- Hit Send
- See the formatted response instantly
Tech Stack
- Next.js 15 App Router
- TypeScript
- Tailwind CSS
- Vercel serverless functions for the proxy
Why Not Just Use curl?
You can! But sometimes you want:
- A visual interface to see headers and body separately
- Response timing at a glance
- Easy header management
- Shareable with non-terminal people
Built this as part of my free developer tools collection. More tools at LuciferForge.
What API testing tool do you use? Would you use something like this?
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