JSON Formatter

JSON Formatter is a fast, lightweight JSON viewer and beautifier for Microsoft Edge. It does one thing and does it well — no ads, no popups, no affiliate injections. Just clean, beautiful JSON formatting. Fully open source.

Whether you're a web developer inspecting REST API responses, a data analyst reviewing JSON exports, or anyone who encounters JSON in the browser, JSON Formatter transforms unreadable data into clean, syntax-highlighted, collapsible trees in one click.

WHAT MAKES JSON FORMATTER DIFFERENT

● 60+ Built-in Themes — Choose from over 60 light and dark syntax highlighting themes. No other JSON formatter offers this level of customization.
● Three Viewing Modes — Switch between Parsed Mode (collapsible tree), Formatted Raw Mode (indented text), and Raw Mode (original).
● Syntax Highlighting — Color-coded keys, values, strings, numbers, booleans, and null for instant readability.
● Dark Mode — Follows your system theme automatically, or set your preferred theme manually.
● Collapsible Tree View — Expand and collapse nested JSON objects and arrays. Use [ to collapse all and ] to expand all.
● Clickable Links — URLs inside JSON values become clickable automatically.
● Keyboard Shortcuts — Navigate fast: P (Parsed), R (Raw), Shift+R (Formatted Raw), D (Dark Mode), T (Toggle Toolbar).
● Customizable Shortcuts — Remap any shortcut key to your preference from extension settings.
● Word Wrapping — Toggle word wrap for long values and stay organized.
● Sort Keys — Alphabetically sort JSON object keys.
● No Ads, No Popups — JSON Formatter will never inject ads, affiliate links, or popups into your browsing.
● Open Source — Fully transparent. Inspect every line of code on GitHub.
● Works Offline — No server requests. Your JSON is processed entirely in your browser.

KEYBOARD SHORTCUTS

P — Parsed View
R — Raw View
Shift + R — Formatted Raw View
D — Toggle Dark Mode
[ — Collapse All
] — Expand All
T — Toggle Toolbar

All shortcuts can be customized in extension settings.

SETUP TIPS

To ensure JSON Formatter works on all sites, go to extension permissions and set site access to "On all sites."

To use with local files, enable "Allow access to file URLs" in extension settings.

LINKS

Website: https://json-formatter.js.org
Source code: https://github.com/jformatter/json-formatter-crx
Bug reports: https://github.com/jformatter/json-formatter-crx/issues
Changelog: https://github.com/jformatter/json-formatter-crx/blob/main/CHANGELOG.md