JSON formatter

iPuzzle

About this app

You know the moment: an API hands back 40 KB of JSON squashed into a single line. You paste it into the browser, open yet another online formatter — it coughs up an ad, a cookie banner wakes up, three CDNs phone home — all just to see where the missing comma is.

JSONformatter is the opposite of all that.

Local. Offline. No accounts. No "Premium" tier. Just a tool that does its job — and does it fast.

✨ WHAT IT DOES
──────────────

🎨 BEAUTIFY — Expands JSON into a readable shape with 2-space, 4-space, or tab indentation. Syntax-highlights everything: strings, numbers, keys, null/true/false — each in its own color.

🪶 MINIFY — Collapses JSON to a single line. When you need to cram a payload into a URL or a log — no whitespace, no line breaks, nothing extra.

🌳 TREE VIEW — Interactive node tree. Collapse and expand branches, navigate large structures without scrolling through thousands of lines. Useful when your JSON is really a tree, not text.

🔀 DIFF — Side-by-side comparison of two JSON documents. Highlights what was added, what changed, what disappeared. Debug API regressions or audit configs — in seconds.

🔁 CONVERT — Transforms JSON into:
• YAML — for configs and CI pipelines
• XML — for legacy integrations
• CSV — for Excel and the data team
• Kotlin / Java / Swift — ready-made data-class boilerplate

🧠 PARSE WITH PRECISION — On error, it shows you the exact position: line, column, what was actually expected. The gutter highlights the bad line in red. None of that "Unexpected token at position 4823" nonsense.

📂 FILE INPUT — Copy/Paste to editor or pull it in via "Upload". Big payloads without the lag.

📋 COPY — One tap, and the formatted (or converted) result is in your clipboard. Simple as that.

🌗 LIGHT / DARK — Two carefully tuned themes. Not lazy clones of system colors — designed for long sessions reading code.

🤏 COMPACT MODE — Smaller font, denser layout. When you need to see more at once.

📱 RESPONSIVE LAYOUT — On phone — overlay sidebar and swipes. On tablet — full workspace. Same logic, different density.

🔒 PRIVACY
──────────
No servers. No trackers. No analytics.
Your JSON never leaves the device.
Works offline. Always.