If the JSON parsing process terminates with error message NAT8331, the JSON input document is syntactically invalid. The reason codes returned, along with NAT8331, represent the following meanings:

Reason Codes for Error Message NAT8331

Reason Code	Explanation
001	An internal error has occurred, and the PARSE process cannot proceed.
002	There is a generic syntax error.
003	VALUE is missing, JSON document is BLANK, or the JSON document is represented in an incorrect Code Page.
004	KEY is missing.
005	COLON is missing.
006	Either a COMMA or a closing of an array or object is missing.
007	String not properly closed.
008	Invalid or unknown escape sequence in a string.
009	Invalid UTF-8 in a string.
010	The JSON document is empty.
111	Storage problem – out of memory.
112	Mismatch in brackets (e.g. "{ ]" or "[ }").
113	Either a VALUE or a closing of an array or object is missing.
114	Either a KEY or a closing of an array or object is missing.
115	End-of-file missing.
116	Unescaped control character in a string.
117	Reached maximum size of JSON document.
118	Reached maximum value limit.
119	Reached maximum nesting level.
120	Reached maximum number value.
121	Reached maximum string length.
122	Reached maximum key length.
123	Root type not allowed.