JSON / YAML / PHP Formatter

Validate, format, and convert between JSON, YAML, and PHP array syntax with syntax highlighting and tree view.

[Lab Tool] [Developer Utilities]

All processing happens locally in your browser. No data is sent to any server.

Indentation

Sort keys alphabetically

Auto-format on input

Input JSON

Output

JSON Input

Short array syntax [] Trailing commas Single quotes

YAML Input

Indent

Sort Keys

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