JSON Formatter & Validator

JSON (JavaScript Object Notation) is the standard data interchange format for web APIs, config files, and data storage. A JSON formatter takes minified or poorly-formatted JSON and re-indents it with consistent spacing, making it human-readable.

JSON tokens consist of:

1. Objects — unordered key-value pairs enclosed in { }. Keys must be strings (double-quoted). Values can be any JSON type.
2. Arrays — ordered lists enclosed in [ ]. Elements can be of mixed types.
3. Values — one of: string (double-quoted), number (integer or float), object, array, true, false, or null.

Copy formatted JSON into your editor, documentation, or PR description. This formatter auto-fixes the most common JSON syntax errors: trailing commas after last elements, single-quoted strings, and unquoted property names.

All formatting happens entirely in your browser. Your JSON is never uploaded to a server or used for AI training.