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+https://www.json.org/json-en.html
+
+```
+json
+    element
+
+value
+    object
+    array
+    string
+    number
+    "true"
+    "false"
+    "null"
+
+object
+    '{' ws '}'
+    '{' members '}'
+
+members
+    member
+    member ',' members
+
+member
+    ws string ws ':' element
+
+array
+    '[' ws ']'
+    '[' elements ']'
+
+elements
+    element
+    element ',' elements
+
+element
+    ws value ws
+
+string
+    '"' characters '"'
+
+characters
+    ""
+    character characters
+
+character
+    '0020' . '10FFFF' - '"' - '\'
+    '\' escape
+
+escape
+    '"'
+    '\'
+    '/'
+    'b'
+    'f'
+    'n'
+    'r'
+    't'
+    'u' hex hex hex hex
+
+hex
+    digit
+    'A' . 'F'
+    'a' . 'f'
+
+number
+    integer fraction exponent
+
+integer
+    digit
+    onenine digits
+    '-' digit
+    '-' onenine digits
+
+digits
+    digit
+    digit digits
+
+digit
+    '0'
+    onenine
+
+onenine
+    '1' . '9'
+
+fraction
+    ""
+    '.' digits
+
+exponent
+    ""
+    'E' sign digits
+    'e' sign digits
+
+sign
+    ""
+    '+'
+    '-'
+
+ws
+    ""
+    '0020' ws
+    '000A' ws
+    '000D' ws
+    '0009' ws
+```