THE TOOLBOX
◈ Runs in your browserJSON formatter
Untangle your data. Validate, format and minify JSON without leaving your browser.
Good to know
How to use JSON formatter
Make compact JSON readable, validate its syntax, or remove unnecessary whitespace. Input and output remain in your browser.
- Paste your JSON into the input editor.
- Choose Format JSON for indented output or Minify for compact output.
- Review any syntax error, or copy and download valid output.
Common questions
Why are comments and trailing commas rejected?
Standard JSON does not allow comments, trailing commas or unquoted property names. Remove them before formatting.
Will very large numbers stay exact?
JavaScript numbers have finite precision. Keep large numeric identifiers as quoted strings when exact digits matter.