javascript string to object

Question

How to apply string object value to a variable Ex.

var str='{a:"www"}'

Now how to set

var obj={a:"www"}

I try eval() but not working

Solution 1

var str='{"a":"www"}';
var obj = JSON.parse(str);

Solution 2

eval should work, and it's actually a MDN solution, not to mention that your string is not a valid JSON, so eval is your only option (if you don't want to include a library for that).

var str='{a:"www"}';
var obj=eval("("+str+")");
console.log(obj);

Quick test in Chrome Dev Tool:

eval("("+'{a:"www"}'+")")
Object
    a: "www"
    __proto__: Object

Just remember to wrap your string in parenthesis and assign it outside eval and it'll be (relatively) safe.

Comments

[HellaMad]

Possible duplicate of stackoverflow.com/questions/6487167/…

[Peter O.]

possible duplicate of String to object in JS

[0lukasz0]

possible duplicate of Safely turning a JSON string into an object

[Admin]

If at all possible, you should use valid JSON. eval() is rarely a good idea

[Samuel Caillerie]

Yes but now it does not corresponds to the requirement :)

[Subir Kumar Sao]

FYI It should also work with eval. But it is not recommended to use eval for security reasons.

[Ankit_Shah55]

@trebuchet Thanks, why eval is a security risk?

[IberoMedia]

for strings that were stored as JSON_stringify trebuchet solution works. I had string "{"1":["2013-05-10","3","#f70707"]}" and after JSON.parser I got Object {1: Array[3]}

[Michael J. Calkins]

@Ankit_Shah55 The only time eval becomes a problem is when User1's input is interpreted as javscript on User2. User2 is then taken to a horrible pornography site and his wife walks in. User2 then goes through a terrible divorce and never sees his children again. But that's just one way.

[Dexygen]

I wasn't wrapping mine in parentheses and I was getting an error. Wrapping the object's string representation in parentheses before calling eval() worked for me too, but why are the parentheses necessary?

[BuddhiP]

Is there a library to handle this?

[Pimp Trizkit]

@GeorgeJempty - According to the MDN Those are needed to declare a function, which I guess is the same for an object. If you are passing a string containing a list of statements, it should work.

[Zachary Raineri]

Awesome thank you! This should be the accepted answer