Runs entirely in your browser. Nothing you enter is sent anywhere.
How to use JSON Formatter
- Paste JSON into the input box.
- Choose Format to pretty-print or Minify to compact it.
- If the JSON is invalid, the error message explains what the parser found.
Frequently asked questions
Is my JSON sent to a server?
No. Parsing and formatting happen in your browser.
Why does my JSON fail to parse?
Common causes are trailing commas, single quotes instead of double quotes, and unquoted keys. JSON is stricter than JavaScript objects.
Does formatting change my data?
No. Only whitespace changes; keys and values stay the same, in the same order.