What is it?
A simple fetch client for probing endpoints from the browser.
Developer tools
API playground
A simple fetch client for probing endpoints from the browser.
Set method and URL, fill headers/body, then Send. Browser CORS rules still apply.
Note: only endpoints that allow CORS can be called from the browser.
Guide
Warm up an API quickly
Why it matters
Check API behavior and headers before writing client code.
How it works
Set method and URL, fill headers/body, then Send. Browser CORS rules still apply.
Go deeper
Why you’ll love this
Probe an endpoint with method, headers, and body from the browser before writing client code.
How to jump in
-
Method and URL
Point at the endpoint.
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Headers and body
Fill when needed.
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Send
Read status, timing, and response body.
What you walk away with
- Common methods
- Line-based headers
- Response timing
- CORS reminder
Where it shines
API warm-up
See what comes back quickly.
Header debugging
Check Authorization and Content-Type.
With JSON Formatter
Pretty-print the response.
Quick answers
Why do some URLs fail?
Usually browser CORS — the server must allow your origin.
Are tokens stored?
No — they only live in the form for that page session.