OwnerKit toolsDeveloper / Free tool
JSON formatter
A clean workspace to validate, format, and minify JSON. All in your browser.
Enable JavaScript to use the calculator. Your inputs are processed in your browser.
Readable JSON, locally
Paste JSON, then choose Format or Minify. The tool checks syntax with your browser’s built-in JSON parser. Formatting uses two-space indentation. Copy the output or download it as a .json file.
Format → validate syntax + add indentation
Minify → validate syntax + remove unnecessary whitespace
Frequently asked questions
What JSON is supported?
Objects, arrays, strings, numbers, booleans, and null are valid. Comments, trailing commas, and single-quoted strings are not valid JSON. Limit: 2 MB of text.
Will values change?
Standard JavaScript number precision applies. Integers larger than 9,007,199,254,740,991 may lose precision; keep large IDs as strings. Duplicate object keys keep the last value, and key order may be normalized.