Paste any JSON to format, validate, or minify it instantly. All processing happens in your browser — your data never leaves your machine.
JSON (JavaScript Object Notation) uses key-value pairs, arrays, and nested objects. The most common API data interchange format.
Paste your JSON — valid content is formatted with indentation, invalid content shows the error location.
Trailing commas after last items, single quotes instead of double quotes, unescaped special characters in strings, and missing colons.
JSON keys must be double-quoted, values cannot be functions or undefined, and JSON is always a string until parsed.
Minifying removes all whitespace to reduce file size. Use minified JSON in production APIs to reduce bandwidth.