Javascript JSON.parse()

Question

I try to use JSON.parse(), but I have error

Uncaught SyntaxError: Unexpected token '

working

JSON.parse('{"inputType":"select", "rules" :[{"rule": "literal_values", "restriction": "US"}]}')

but not working

enter image description here

why the second version not working?

typeof(validRules) is string

There is no reason this would produce different results. Are you sure you have the exact same string in your test environment? — musefan
– musefan, Commented Jun 17, 2014 at 13:48
please paste output of "typeof (validRules)" if it is string then your code is ok but if its o/p is object then you are doing it wrong. — Sohil Desai
– Sohil Desai, Commented Jun 17, 2014 at 13:59

Jonathan Lonowski · Accepted Answer · 2014-06-17 14:17:26Z

1

The screenshot shows the single-quotes as characters within the string's value.

console.log(JSON.parse("'{\"inputType\":\"select\"}'"))
//                      ^                          ^
// SyntaxError: Unexpected token '

console.log(validRules.charAt(0));     // "'" vs. "{"
console.log(validRules.charCodeAt(0)); // 39  vs. 123

While, in your snippet, they're acting as the delimiters for the string literal.

console.log(JSON.parse('{"inputType":"select"}'))
// { inputType: 'select' }

You'll need to remove the single-quotes from the string value for it to be parsed as JSON.

answered Jun 17, 2014 at 14:07

Jonathan Lonowski

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