JSON Formatter
Last updated: April 26, 2026Format, validate and minify JSON.
JSON Formatter is a free online tool to format, validate and minify JSON. It runs entirely in your browser, so your files never leave your device — nothing is uploaded. There's no sign-up, no watermark, and it works on any modern browser on desktop or mobile.
How to use JSON Formatter
This free JSON formatter beautifies messy JSON with clean indentation, validates it with clear error messages, and can minify it down to a single line. Paste your data to instantly catch syntax problems or make a payload readable. It runs entirely in your browser with no sign-up, so your JSON is never uploaded to a server.
Read the full guide: JSON Formatter: Format, Validate & Minify JSON Online
- 1Paste your JSON into the editor, whether it is minified or poorly indented.
- 2Click format to beautify it, or minify to compress it into one line.
- 3Review any validation errors, then copy the cleaned JSON for your project.
Beautify and minify
Pretty-print JSON with proper indentation or shrink it to a compact single line.
Built-in validation
Spot syntax errors quickly with clear messages so you can fix broken JSON.
Private by design
All formatting happens in your browser, keeping API keys and data off any server.
JSON Formatter — frequently asked questions
Does this tool validate my JSON?
Yes, it checks your input against JSON syntax rules and reports errors with helpful messages. This makes it easy to find a missing comma, bracket or quote.
What is the difference between formatting and minifying JSON?
Formatting adds indentation and line breaks so JSON is easy for humans to read. Minifying removes all unnecessary whitespace to make the payload as small as possible for transfer.
Is it safe to paste sensitive JSON here?
Yes, because all processing runs locally in your browser and nothing is uploaded. Your data, including any tokens or keys, never leaves your device.
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