JSON.parse error Javascript

Question

A problem. Again. Here is the code:

if(localStorage.getItem("temporaryArray")){
    var temporaryArray = JSON.parse(localStorage.getItem("temporaryArray"));
}else{
    var temporaryArray = [];
}

So basically what it does is that when a new page is loaded I don't want to reset the array because later in the code I assign something to this array in localStorage. So what I'm trying to say is that if you can get this item, then when the code is loaded again assign this variable to the localStorage item. Else, just set it to an empty array. But here is the error I'm getting because the array is currently empty(I think that's the reason why):

Uncaught SyntaxError: Unexpected token o in JSON at position 1
    at JSON.parse (<anonymous>)
    at main.js:61

Any help would be very much appreciated.

show how you set temporaryArray - my guess is, you are not using JSON.stringify - because of the o in [object Object] — Jaromanda X
– Jaromanda X, Commented Jun 9, 2017 at 10:29
When you set value, use JSON.stringify. If not, [object Object] will be set and hence Unexpected token o in JSON at position 1 — Rajesh Dixit
– Rajesh Dixit, Commented Jun 9, 2017 at 10:30
@Rajesh When I set the values I have been using JSON.stringify — Scratch Cat
– Scratch Cat, Commented Jun 9, 2017 at 10:49
@Rajesh Hello everyone I've fixed it! It was showing [object Object] for some reason so I went into the console and set the localStorage item to an empty string and now it's fixed. Thank you everyone! — Scratch Cat
– Scratch Cat, Commented Jun 9, 2017 at 10:55

David Narum · Accepted Answer · 2017-06-09 10:37:01Z

1

If a method invocation fails, it usually helps to look at what the input to the function is. I would recommend doing console.log(localStorage.getItem("temporaryArray")) before the JSON.parse() call to see what the problem is.

What I would guess the source of the problem is, is that at some point you are calling localStorage.setItem("temporaryArray",value) and have forgotten to do JSON.stringify() on the value.

answered Jun 9, 2017 at 10:37

David Narum

3122 silver badges3 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

JSON.parse error Javascript

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related