1618.dev

JSON formatter

Paste JSON to beautify, validate, or minify it. Choose your indentation, optionally sort object keys, and copy the result. Everything runs in your browser — nothing is uploaded.

What this does

The input is parsed by Python's standard json module and re-serialized — so validation is exactly as strict as a real parser. Comments, trailing commas, and single-quoted strings are not valid JSON and will be flagged. When parsing fails, you get the parser's own message together with the line and column of the offending character, so you can jump straight to the problem.

Minify strips every optional space and newline for the smallest payload. Sort keys orders each object's keys alphabetically, which makes two JSON documents easy to diff. Non-ASCII text (accents, emoji, other scripts) is kept as-is rather than escaped to \uXXXX.