API tester

Test public HTTP APIs from your browser. No Postman account.

One vote per browser. A higher count helps Plainjar prioritize what ships first. No promise, no waitlist.

What this tool will do

GET / POST / PUT / PATCH / DELETE with headers and body, straight from your browser.
Works on public endpoints that allow CORS. No Postman cloud, no collection sync, no account.
For when you want to poke an API once without installing Postman. Not for private internal APIs (CORS limitation).

Get a heads-up when API tester goes live. One email when it's ready, nothing else.

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