Reference

File Extension

Recommended: .lpml

Alternative: .json or .json5 for editor syntax highlighting

---

Differences from JSON5

Feature	JSON5	LPML
Comments	✓	✓
Trailing commas	✓	✓
Unquoted keys	✓	✓
Spacey keys	✗	✓
Single quotes	✓	✓
Hex numbers	✓	✓
Octal/binary numbers	✗	✓
MAX_INT/MAX_FLOAT	✗	✓
String concatenation	✗	✓
File includes	✗	✓
Multiline folding	✗	✓

---

Grammar Summary

value       ::= object | array | string | number | boolean | null
                | 'undefined' | 'Infinity' | 'NaN' | 'MAX_INT' | 'MAX_FLOAT'
object      ::= '{' members? '}'
members     ::= pair (',' pair)* ','?
pair        ::= key ':' value
key         ::= identifier | spacey_key | string
spacey_key  ::= (char - ':' - '\n')+        // any run up to the first ':', trimmed; spaces, hyphens, UTF-8 all ok
array       ::= '[' elements? ']'
elements    ::= value (',' value)* ','?
string      ::= '"' chars '"' | "'" chars "'" | string string  // concatenation
number      ::= hex | octal | binary | decimal
boolean     ::= 'true' | 'false'
null        ::= 'null'
comment     ::= '//' [^\n]* | '/*' .*? '*/'

---

Credits

Created by Gesslar. Based on the JSON5 specification.

License

Unlicense — public domain.