JSON Formatter & Validator
Paste JSON, get formatted, validated, copyable output.
Input
About this tool
A clean JSON formatter that does what you want and nothing else. Paste JSON, get pretty-printed output. Click minify to compact it. Click copy to grab the result. Errors are highlighted with the exact line and character so you can fix them fast.
How to use it
- Paste your JSON into the input box.
- Click Format to pretty-print it, or Minify to compact it.
- Click Copy to grab the output. If the JSON is invalid, the exact line and character of the error are shown.
FAQ
Does my JSON leave my browser?+
No. Formatting and validation happen entirely locally — nothing is uploaded.
Does it support trailing commas or comments?+
Strict JSON does not allow either, and this tool follows the strict spec. If you have JSON5 or JSONC, remove the extras first.