PRIVATE ENCODING TOOLBOX
JSON Formatter & Minifier
Format, validate, or minify JSON.
Encoding changes representation, not meaning or security. Results are generated locally and are not encryption.
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JSON
Format, validate, or minify JSON.
Enable JavaScript to use this interactive local tool. The guide below remains available without JavaScript.
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QUICK GUIDE
How to format, validate, and minify JSON
Formatting makes JSON easier to inspect; minifying removes insignificant whitespace. Both modes parse the input first, so invalid JSON is reported instead of silently changed.
Local processing
Nothing you enter or upload is sent to a server, saved, or shared.
Nothing you enter or upload is sent to a server, saved, or shared.
Use it in three steps
- Choose Format or Minify.
- Paste a JSON object, array, or primitive.
- Fix any syntax error, then copy or download the output.
Practical example
Example{"private":true} → neatly indented JSON
Format limitsJSON does not allow comments, trailing commas, undefined, or single-quoted strings.
Common errorsUse double quotes around keys and strings, remove trailing commas, and close every bracket.
Frequently asked questions
Does formatting change values?
No. It changes whitespace only after parsing.
Are large integers preserved exactly?
JavaScript numbers can lose precision beyond the safe integer range.
Is JSON uploaded?
No. Parsing is entirely local.