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{} JSON Formatter & Validator

Format, validate, and beautify JSON data with syntax highlighting.

All processing happens locally in your browser. No data is sent to any server. GDPR/DORA compliant.

Indentation

Sort keys alphabetically

Auto-format on input

Input JSON

Output

JSON Reference (RFC 8259)

Data Types

string - "text in quotes"
number - 123, -45, 3.14
boolean - true, false
null - null
array - [1, 2, 3]
object - {"key": "value"}

Common Errors

Trailing comma in array/object
Single quotes instead of double
Unquoted keys
Comments (not allowed)
Undefined values

Escape Sequences

\" - Double quote
\\ - Backslash
\n - Newline
\t - Tab
\uXXXX - Unicode

Best Practices

Use consistent indentation
Sort keys for readability
Validate before use
Minify for production
Use meaningful key names