JSON Beautifier

Format, highlight, and inspect JSON with syntax coloring, collapsible tree view, minify toggle, copy, and light/dark theme.

JSON Beautifier turns raw or minified JSON into a clean, readable, color-coded view — right in your browser, with no external services and no data ever leaving your machine. ── PASTE & GO ────────────────────────────── Drop any JSON into the input box and click Beautify (or press Ctrl+Enter / Cmd+Enter). Valid JSON is also auto-formatted as soon as you paste it, so you rarely need to press anything at all. A live indicator dot shows whether your input is valid JSON before you even submit. ── SYNTAX HIGHLIGHTING ───────────────────── Every token type gets its own color: • Keys — blue • Strings — orange/red • Numbers — green • Booleans — blue • Null — blue ── COLLAPSIBLE TREE ──────────────────────── Large JSON structures are fully navigable. Click the ▾ arrow next to any object or array to collapse it into a single line, then expand it again. This makes it easy to focus on the parts that matter without losing context. ── MINIFY & COPY ─────────────────────────── Switch between the pretty-printed view and a minified single-line view with one click. Copy either format to the clipboard instantly — no manual selecting required. ── STATS AT A GLANCE ─────────────────────── The toolbar shows the total line count, the number of keys (counted recursively across all nested objects), and the maximum nesting depth — useful for quickly understanding the shape of an unfamiliar payload. ── SESSION HISTORY ───────────────────────── Your last input is remembered between sessions. If you close and reopen the extension, a "Restore last session" button lets you pick up exactly where you left off. Clear the saved input any time with a single click. ── DARK & LIGHT THEME ────────────────────── Switch between a dark VS Code–inspired theme and a clean light theme. Your preference is remembered across sessions. ── KEYBOARD SHORTCUT ─────────────────────── Press Ctrl+Enter (Windows/Linux) or Cmd+Enter (Mac) to beautify without reaching for the mouse. ── PRIVACY ───────────────────────────────── JSON Beautifier is 100% local. It requests only the minimum permission needed to open a new tab. No analytics, no network requests, no accounts. Your data never leaves your browser.