Size limit of JSON data type in PostgreSQL

Question

Does anyone know what is the limit on the size of JSON data type in PostgreSQL 9.2?

Answer 1

Looking at the source for PostgreSQL 9.2.1:

Source: postgresql-9.2.1\src\backend\utils\adt\json.c: /*  * Input.  */ Datum json_in(PG_FUNCTION_ARGS) {     char       *text = PG_GETARG_CSTRING(0);      json_validate_cstring(text);      /* Internal representation is the same as text, for now */     PG_RETURN_TEXT_P(cstring_to_text(text)); } 

Update for PostgreSQL 9.3.5:

The code has changed in the json_in function, but the json internal representation is still text:

Source: postgresql-9.3.5\src\backend\utils\adt\json.c: /*  * Input.  */ Datum json_in(PG_FUNCTION_ARGS) {     char       *json = PG_GETARG_CSTRING(0);     text       *result = cstring_to_text(json);     JsonLexContext *lex;      /* validate it */     lex = makeJsonLexContext(result, false);     pg_parse_json(lex, &nullSemAction);      /* Internal representation is the same as text, for now */     PG_RETURN_TEXT_P(result); } 

So it appears that, for now at least, json is the same as a text datatype but with JSON validation. The text datatype's maximum size is 1GB.