JSON Formatter
Validate, format, and minify JSON.
Everything is processed on your device. No file or text is uploaded.
JSON must use double-quoted keys and contain no trailing commas. JavaScript number precision applies; avoid reformatting large integer identifiers.
How to use
Paste valid JSON, choose Format or Minify, then download the result.
When to use JSON Formatter
Make API responses and configuration files easier to inspect. Formatting changes whitespace; minifying removes unnecessary whitespace while retaining JSON structure.
Practical example
Input {"name":"Asha","active":true} becomes an indented object when you choose Format JSON. A trailing comma is rejected because it is not valid JSON.
Will large numbers stay exactly the same?
Not always. Parsing uses JavaScript numbers, which cannot exactly represent every integer above 9,007,199,254,740,991. Keep large identifiers quoted as strings and keep your original.