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API Workbench
Lightweight REST client that even reaches localhost
chromeedgebraveoperafirefox🔒 Zero telemetryVersion 1.0.0
Description
A lightweight REST client right in your browser: build a request (method, URL, headers, body), send it, and inspect status, headers and body with automatic JSON pretty-printing. Save requests and collections locally. Unlike an HTTPS web tool, the extension reaches arbitrary endpoints and localhost/127.0.0.1 with no mixed-content or Private Network Access blocks. 100% offline, zero telemetry.
Features
- Request builder: method, URL, headers and body
- Reaches localhost and 127.0.0.1 (no mixed-content / PNA)
- Automatic JSON pretty-printing of the response
- Response status, timing, size and headers
- Content-type detection (JSON/HTML/XML/CSS/JS/text/binary)
- Locally saved request collections
- Header and URL validation with clear messages
- 100% offline, zero telemetry
Privacy
100% local processing in your browser. Zero telemetry: no data is sent to external servers.
Required permissions
Screenshots

Supported browsers
chromeedgebraveoperafirefox