Getting Started
Install and start using Best JSON Viewer in under a minute.
Installation
Install Best JSON Viewer from the Chrome Web Store:
A Firefox version is also available. Visit the extension page for the latest download links.
Activation Modes
Best JSON Viewer offers two activation modes:
Manual (Default)
Click the extension icon or right-click and select View in JSON Viewer on any page. The viewer activates only when you choose.
Auto
Enable auto-detection in the extension settings and grant the optional <all_urls> permission. Any page served with a JSON content type (application/json, text/plain, etc.) will automatically be formatted and displayed in the viewer.
Auto mode requires the <all_urls> host permission, which is requested at runtime — not at install time. You stay in control.
Quick Tour
Once activated, you'll see the viewer toolbar at the top of the page:
- View switcher — Toggle between Tree, Raw, Table, Visualize, and Edit views.
- JSONata input — Type a JSONata expression to query, filter, or transform your data.
- Theme toggle — Cycle between Dark, Light, and System themes.
- Copy / Export — Copy the current data to your clipboard or download it as a
.jsonfile.
That's it. No signup, no configuration files, no accounts.