JSON Lens — Fast JSON Viewer

About

JSON Lens turns any raw JSON page into a clean, readable, interactive viewer — instantly and entirely on your device.

When you open an API response or a .json file, your browser normally shows a wall of unformatted text. JSON Lens detects that the page is JSON and replaces it with a syntax-highlighted, collapsible tree.

✨ WHAT YOU GET
• Syntax highlighting — keys, strings, numbers, booleans and null in distinct colors.
• Collapse & expand any object or array; collapsed nodes show a quick "{…} N keys" / "[…] N items" summary.
• Expand all / Collapse all in one click.
• Search across keys and values, with match highlighting and next/previous navigation.
• Copy the whole JSON, copy a single value, or copy the exact path to any node (e.g. $.users[3].email).
• Toggle between the parsed viewer and the original raw text.
• A clean dark theme that's easy on the eyes.

🚀 BUILT FOR HUGE FILES
Most JSON viewers freeze on large responses. JSON Lens uses virtual rendering — it only draws the rows you can actually see — so multi-megabyte files with tens of thousands of items open in seconds and stay smooth.

🔒 PRIVATE BY DESIGN
• No permissions and no host permissions requested.
• No network requests — everything happens locally in your browser.
• No accounts, no tracking, no ads, no remote code.
• It only ever touches a page that is already JSON; on everything else it does nothing.

Free. Open the JSON, and read it the way it was meant to be read.