JSON formatter

How to use

Paste JSON or open a .json file, then format, minify or validate it. Everything runs in your browser; nothing is uploaded.

Output

Format or minify to see the result here. Validate checks the input without changing it.

Notes

Numbers larger than Number.MAX_SAFE_INTEGER (2⁵³ − 1) lose precision with JSON.parse. This tool does not use a custom parser, so keep big integers as strings if you need every digit.
Inputs around 5 MB or larger may feel slow; the page warns before you run Format or Minify on them.