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  2. JavaScript
  3. JavaScript 参考
  4. JavaScript 错误参考
  5. SyntaxError: JSON.parse: bad parsing

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SyntaxError: JSON.parse: bad parsing

信息

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

错误类型

SyntaxError

哪里出错了?

JSON.parse() 会把一个字符串解析成 JSON 对象。如果字符串书写正确,那么其将会被解析成一个有效的 JSON,但是这个字符串被检测出错误语法的时候将会抛出错误。

示例

JSON.parse() 不允许在末尾添加多余的逗号

下面两行代码都会抛出错误:

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

省略末尾多余的逗号解析 JSON 就是正确:

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

JSON 的属性名必须使用双引号

属性名上不能使用单引号,例如: 'foo'。

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

取而代之,写成 "foo":

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

前导 0 和小数点

数字不能用 0 开头,比如 01,并且你的小数点后面必须跟着至少一个数字。

js
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

正确的写法应该是只写一个 1,不书写前面的 0。在小数点的后面至少要跟上一个数字:

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

参见

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