JSON Formatter & Validator
Paste JSON to format, validate, and minify. See key count, nesting depth, and size at a glance. Real-time as you type.
About JSON Formatting
JSON (JavaScript Object Notation) is a lightweight data-interchange format. Formatting JSON with proper indentation makes it human-readable, while minifying removes whitespace to reduce payload size. Sorting keys alphabetically makes diffs cleaner and JSON easier to scan.
Raw JSON string — possibly minified, poorly formatted, or invalid
JSON.parse() validates syntax — checks for matching braces, proper quoting, valid values, and trailing commas
If invalid, the parser reports the error type and approximate position — helps locate the issue
JSON.stringify() with configurable indentation (2/4 spaces or tabs) and optional key sorting
Properly formatted, valid JSON — human-readable with consistent indentation and structure
Spec: RFC 8259 (JSON), ECMA-404 (JSON Data Interchange Syntax)