SyntaxError: JSON.parse: unterminated string literalSyntaxError: JSON.parse: bad control character in string literalSyntaxError: JSON.parse: bad character in string literalSyntaxError: JSON.parse: bad Unicode escapeSyntaxError: JSON.parse: bad escape characterSyntaxError: JSON.parse: unterminated stringSyntaxError: JSON.parse: no number after minus signSyntaxError: JSON.parse: unexpected non-digitSyntaxError: JSON.parse: missing digits after decimal pointSyntaxError: JSON.parse: unterminated fractional numberSyntaxError: JSON.parse: missing digits after exponent indicatorSyntaxError: JSON.parse: missing digits after exponent signSyntaxError: JSON.parse: exponent part is missing a numberSyntaxError: JSON.parse: unexpected end of dataSyntaxError: JSON.parse: unexpected keywordSyntaxError: JSON.parse: unexpected characterSyntaxError: JSON.parse: end of data while reading object contentsSyntaxError: JSON.parse: expected property name or '}'SyntaxError: JSON.parse: end of data when ',' or ']' was expectedSyntaxError: JSON.parse: expected ',' or ']' after array elementSyntaxError: JSON.parse: end of data when property name was expectedSyntaxError: JSON.parse: expected double-quoted property nameSyntaxError: JSON.parse: end of data after property name when ':' was expectedSyntaxError: JSON.parse: expected ':' after property name in objectSyntaxError: JSON.parse: end of data after property value in objectSyntaxError: JSON.parse: expected ',' or '}' after property value in objectSyntaxError: JSON.parse: expected ',' or '}' after property-value pair in object literalSyntaxError: JSON.parse: property names must be double-quoted stringsSyntaxError: JSON.parse: expected property name or '}'SyntaxError: JSON.parse: unexpected characterSyntaxError: JSON.parse: unexpected non-whitespace character after JSON data

JSON.parse() parses a string as JSON. This string has to be valid JSONand will throw this error if incorrect syntax was encountered.

Both lines will throw a SyntaxError:

JSON.parse("[1, 2, 3, 4,]");JSON.parse('{"foo": 1,}');// SyntaxError JSON.parse: unexpected character// at line 1 column 14 of the JSON data

Omit the trailing commas to parse the JSON correctly:

JSON.parse("[1, 2, 3, 4]");JSON.parse('{"foo": 1}');

You cannot use single-quotes around properties, like 'foo'.

JSON.parse("{'foo': 1}");// SyntaxError: JSON.parse: expected property name or '}'// at line 1 column 2 of the JSON data

Instead write "foo":

JSON.parse('{"foo": 1}');

You cannot use leading zeros, like 01, and decimal points must be followed by at leastone digit.

JSON.parse('{"foo": 01}');// SyntaxError: JSON.parse: expected ',' or '}' after property value// in object at line 1 column 2 of the JSON dataJSON.parse('{"foo": 1.}');// SyntaxError: JSON.parse: unterminated fractional number// at line 1 column 2 of the JSON data

Instead write just 1 without a zero and use at least one digit after a decimal point:

JSON.parse('{"foo": 1}');JSON.parse('{"foo": 1.0}');

• JSON
• JSON.parse()
• JSON.stringify()