JSON Formatter
Format, validate, minify and explore JSON — handles huge inputs without freezing the tab.
Never uploadedInstant, in-browserNo account needed
Loading tool…
A fast, fully client-side JSON formatter and validator. Beautify or minify with configurable indentation, catch syntax errors with precise line/column diagnostics, and inspect deeply nested structures. Nothing is ever uploaded.
Frequently asked
Is my JSON uploaded anywhere?
No. Everything runs in your browser — the JSON never leaves your device.
How large an input can it handle?
Multi-megabyte documents parse smoothly.
More Format & Dev tools
- SQL FormatterFormat MySQL, PostgreSQL and T-SQL with configurable indentation.
- Markdown PreviewRender Markdown live with GFM support and copy as clean HTML.
- Base64 Encode / DecodeEncode and decode Base64 text and files in your browser.
- JWT DecoderInspect JWT header, payload and expiry — tokens never leave the page.
- Regex TesterTest regular expressions live with match highlighting and capture groups.
- Diff CheckerCompare two texts and see additions and removals line by line.
- Cron BuilderBuild cron expressions and read them back in plain English.