JSON Formatter
Beautify, minify, validate and explore JSON instantly. Paste or open a .json file to pretty-print it with clean indentation, browse it as a collapsible tree, collapse it to one line, or see exactly where it’s invalid — all in your browser.
- 🔒 100% private — no uploads
- 🆓 Free, no watermark
- 📱 Works on any device
How to format
- 1
Paste or open your JSON
Type directly or paste your text into the box. It’s processed right in your browser — nothing is uploaded to a server.
- 2
See the result instantly
The tool updates live as you type, showing a collapsible tree, formatted or minified JSON with no “submit” button or waiting.
- 3
Copy or keep going
Copy the result with one click, tweak your input, or clear it and start again. Free, instant and private.
Why use JSON Formatter?
Collapsible tree view
Explore nested JSON as an interactive tree — collapse and expand any object or array, with one click to expand or collapse everything.
Beautify or minify
Pretty-print with two-space indentation for readability, or minify to the smallest valid one-line form.
Open a file or paste
Load a .json file straight from your device, or just paste — validation shows the parser’s error so you can find the stray comma fast.
100% private
Everything runs locally in your browser with JavaScript. Your text is never uploaded, stored or seen by anyone — it even works offline.
Format JSON without sending it anywhere
API responses and config files often contain tokens, keys and personal data. Many “JSON formatter” sites send what you paste to a server. This one parses and re-serializes entirely in your browser, so sensitive payloads never leave your device.
Why pretty-printing helps
Minified JSON is great for bandwidth but impossible to read or debug by eye. Proper indentation and the tree view reveal structure, missing commas, or extra braces instantly. The validator points at the exact token where the parser failed so you can fix it without guessing.
Working with real data safely
When you receive a JSON payload from an API or a colleague, paste it here to inspect it before you trust it in code. The file loader lets you open a local .json without any network call. Minify mode is useful when you need to paste a compact version into a URL or a one-line config.
Frequently asked questions
Does it validate my JSON?
Yes. If the input isn’t valid JSON, the parser’s error message is shown instead of output, pointing you at the problem. Valid JSON is re-formatted or minified.
Is my text uploaded to a server?
No. The tool runs entirely in your browser, so whatever you type or paste stays on your device. It’s safe for code, tokens and confidential text, and works offline once loaded.