Free JSON Formatter

Free JSON Formatter turns any raw JSON page into an interactive, collapsible, syntax-highlighted tree - instantly, and entirely inside your own tab. PRIVACY, VERIFIABLE - No ads. No affiliate code. Nothing is injected into any page you visit. - No telemetry, no analytics, no tracking. - Zero network requests - the extension has no server to talk to. - One permission: "storage", used only to remember your own settings. - Open source (MIT). Read every line: github.com/andret2344/free-json-formatter - Under 30 kB packed. No remote code, no bundled SDKs. These are checkable claims, not promises. The end-to-end test suite asserts that formatting a document makes no network request at all, and the privacy policy lists every single key the extension writes to your device. FEATURES - Automatic detection of JSON pages (application/json, .json URLs, or a plain <pre></pre> of valid JSON) - Collapsible tree with lazy rendering - multi-megabyte documents stay responsive - Syntax highlighting for keys, strings, numbers, booleans and null - In-tree search with match count, next/previous, and case-sensitivity toggle - it searches the parsed JSON, so it finds matches inside branches you have not opened yet - Line numbers that stay stable when you fold, exactly like code folding - Copy path - hover any line, copy a console-ready accessor (json.items[0].id) straight into devtools, where the document is already exposed as "json" - Line links - click a line number to get #L21 in the address bar; the link reopens that exact line later - Expand all / Collapse all, cancellable, plus Ctrl/Cmd+click to fold a whole level - Formatted / Raw toggle - the original text is one click away - Copy raw or copy re-indented JSON - Indent guides, highlighted for the level under your pointer - Clickable URLs inside string values - Themes: Auto (follows your OS), Light, Dark - Configurable indentation: 2/4/6/8 spaces, or 1/2 tabs - Line wrapping toggle - Settings for maximum payload size and initial tree depth - the popup never reloads your tab, so nothing on screen is thrown away BUILT FOR BIG DOCUMENTS Large files open at a sensible depth instead of dumping 20,000 lines on you. Branches are rendered only when you open them. Expanding a huge tree runs in batches you can cancel at any time. Works on Chrome, Edge, Brave, and Firefox. Source: github.com/andret2344/free-json-formatter Issues: github.com/andret2344/free-json-formatter/issues