Format, validate, and analyze JSON data
{"name": "John", "age": 30, "city": "New York", "hobbies": ["reading", "coding"]}JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write and easy for machines to parse and generate. A JSON formatter takes minified or unformatted JSON text and applies consistent indentation (typically 2 or 4 spaces) to make the structure visually clear, showing the hierarchy of objects and arrays. A JSON validator checks whether the text conforms to the JSON specification (RFC 8259): it verifies matching braces and brackets, proper string quoting with double quotes, valid number formats, and correct use of null, true, and false literals. Common JSON errors include trailing commas (not allowed in standard JSON), single-quoted strings, unquoted keys, and comments. This tool formats, validates, and minifies JSON entirely in your browser — no data is sent to any server.
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