Eval() = Unexpected token : error

Question

I tried this simple JavaScript code:

eval('{"Topics":["toto","tata","titi"]}')

In the Chrome console, for example, this returns

SyntaxError: Unexpected token :

I tried the JSON on JSONLint and it's valid.

Do you see the bug?

Solution 1

FWIW, use JSON.parse instead. Safer than eval.

Solution 2

You have to write like this

eval('('+stringJson+')' );

to convert an string to Object

Hope I help!

Solution 3

Number one: Do not use eval.

Number two. Only use eval to make something, well be evaluated. Like for example:

eval('var topics = {"Topics":["toto","tata","titi"]}');

Solution 4

Because that's evaluating an object. eval() requires you to pass in syntactically valid javascript, and all you're doing is passing in a bare object. The call should be more like:

eval('var x = {"Topics":etc...}');

Solution 5

USE:

function evalJson(jsArray){ eval("function x(){ return "+ jsArray +"; }"); return x(); }

var yourJson =evalJson('{"Topics":["toto","tata","titi"]}');

console.log(yourJson.Topics[1]); // print 'tata''

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Comments

[Patrick Jackson]

works for me..don't know if it is the best practice, but it got me up and running

[Kevin Beal]

This was the only solution that worked in my case. Thank you!

[apocalypz]

thx, this is much better than accepted answer. It is good to point out that eval is evil :), but still, this answers the question.

[Stephen Paul]

I had the same issue evaluating a normal javascript function and this solved my problem. Why / how does wrapping an expression in parenthesis fix the problem?

[Mayur Gupta]

This works for me