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-- Strings.
SELECT '""'::json; -- OK.
SELECT $$''$$::json; -- ERROR, single quotes are not allowed
SELECT '"abc"'::json; -- OK
SELECT '"abc'::json; -- ERROR, quotes not closed
SELECT '"abc
def"'::json; -- ERROR, unescaped newline in string constant
SELECT '"\n\"\\"'::json; -- OK, legal escapes
SELECT '"\v"'::json; -- ERROR, not a valid JSON escape
SELECT '"\u"'::json; -- ERROR, incomplete escape
SELECT '"\u00"'::json; -- ERROR, incomplete escape
SELECT '"\u000g"'::json; -- ERROR, g is not a hex digit
SELECT '"\u0000"'::json; -- OK, legal escape
SELECT '"\uaBcD"'::json; -- OK, uppercase and lower case both OK
-- Numbers.
SELECT '1'::json; -- OK
SELECT '0'::json; -- OK
SELECT '01'::json; -- ERROR, not valid according to JSON spec
SELECT '0.1'::json; -- OK
SELECT '9223372036854775808'::json; -- OK, even though it's too large for int8
SELECT '1e100'::json; -- OK
SELECT '1.3e100'::json; -- OK
SELECT '1f2'::json; -- ERROR
-- Arrays.
SELECT '[]'::json; -- OK
SELECT '[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]'::json; -- OK
SELECT '[1,2]'::json; -- OK
SELECT '[1,2,]'::json; -- ERROR, trailing comma
SELECT '[1,2'::json; -- ERROR, no closing bracket
SELECT '[1,[2]'::json; -- ERROR, no closing bracket
-- Objects.
SELECT '{}'::json; -- OK
SELECT '{"abc"}'::json; -- ERROR, no value
SELECT '{"abc":1}'::json; -- OK
SELECT '{1:"abc"}'::json; -- ERROR, keys must be strings
SELECT '{"abc",1}'::json; -- ERROR, wrong separator
SELECT '{"abc"=1}'::json; -- ERROR, totally wrong separator
SELECT '{"abc"::1}'::json; -- ERROR, another wrong separator
SELECT '{"abc":1,"def":2,"ghi":[3,4],"hij":{"klm":5,"nop":[6]}}'::json; -- OK
SELECT '{"abc":1:2}'::json; -- ERROR, colon in wrong spot
SELECT '{"abc":1,3}'::json; -- ERROR, no value
-- Miscellaneous stuff.
SELECT 'true'::json; -- OK
SELECT 'false'::json; -- OK
SELECT 'null'::json; -- OK
SELECT ' true '::json; -- OK, even with extra whitespace
SELECT 'true false'::json; -- ERROR, too many values
SELECT 'true, false'::json; -- ERROR, too many values
SELECT 'truf'::json; -- ERROR, not a keyword
SELECT 'trues'::json; -- ERROR, not a keyword
SELECT ''::json; -- ERROR, no value
SELECT ' '::json; -- ERROR, no value
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