Json Bonito by Jorge Senín

JSON formatter that runs only in your browser, easy, simple, fast — opens in a full tab for comfortable editing.

Experimental

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About this extension

Json Bonito

A Firefox extension that opens a beautiful, full-tab JSON formatter and editor when you click the toolbar icon.
Why Json Bonito

Your data stays on your machine. Json Bonito processes everything locally in your browser — no data is ever sent to any server. Paste API responses, credentials, internal configs, or any sensitive payload without worrying about it leaving your machine.

Fast. It opens instantly as a browser tab and processes JSON using the browser's native engine. No loading screens, no network round-trips.

Simple. Paste JSON, press Ctrl+Enter. That's it.

Free software. Licensed under the BSD 2-Clause License. No accounts, no subscriptions, no telemetry.
Features

Format (pretty-print) and minify JSON
Sort object keys alphabetically (recursively)
Unescape JSON-encoded strings
Real-time validation with line/column error reporting
Copy, paste, and download output
Dark and light theme (follows OS preference, manually overridable)
Keyboard shortcuts: Ctrl/Cmd+Enter format, Ctrl/Cmd+Shift+M minify, Ctrl/Cmd+Shift+K sort keys

Installation

Download or clone this repository
Open Firefox and go to about:debugging
Click This Firefox → Load Temporary Add-on
Select json-bonito-v4/manifest.json

License

BSD 2-Clause License

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