Question

I try to change a string into an object using eval but failed.

var obj ="{a:0, b:-1}";
eval(obj);

Error msg says “invalid label” but even this doesn’t work

var obj="{'a':'0', 'b':'-1'}";

What’s wrong with the code?

Answer 1

when evaling json, you have to put braces around it, so it should look like (otherwise it’s not a complete javascript-statement):

eval('('+obj+')');

this solved the error, but the generated object isn’t saved to any variable – so you might want to end up with something else, like:

eval('obj = '+obj);

this also makes a complete statement and, in addition, obj now is a “real” object.