API Request Tester — Send GET/POST/PUT/DELETE with Headers & Body Online

Test APIs Without Leaving Your Browser

I added an API Request Tester to devnestio — a lightweight Postman-like tool that runs entirely in the browser.

🔗 Try it → api-tester-dev.pages.dev

Features

• 7 HTTP methods: GET, POST, PUT, PATCH, DELETE, HEAD, OPTIONS
• Custom request headers — add/remove key-value pairs
• Request body editor — with Format JSON and sample body buttons
• Query params editor — auto-builds the full URL
• Response viewer:
  • Status badge with color (2xx green, 3xx yellow, 4xx/5xx red)
  • Response time (ms) and size (B/KB)
  • JSON syntax highlighting (keys, strings, numbers, booleans, null)
  • Response headers table
• 5 quick example requests to try immediately

Quick example requests

Example	Method	URL
JSONPlaceholder	GET	https://jsonplaceholder.typicode.com/posts/1
My IP	GET	https://api.ipify.org?format=json
Post data	POST	https://jsonplaceholder.typicode.com/posts
UUID	GET	https://httpbin.org/uuid
Cat fact	GET	https://catfact.ninja/fact

Built with

• Pure Vanilla JS, fetch API
• No dependencies, no backend
• Single HTML file on Cloudflare Pages
• CORS applies — works with public APIs

Part of devnestio — free developer micro-tools.