Retrieve Local Storage array list using JSON.parse()

Question

I want to loop through each array of my saved localstorage, but with this code

localStorage.setItem("fav", JSON.stringify(merchant));

                var savedMerchant = JSON.parse(localStorage.getItem("fav"));

                $.each(savedMerchant,function(){
                    console.log(this);

                });

why got this??

String {0: "L", length: 1, [[PrimitiveValue]]: "L"}
VM420:210 String {0: "a", length: 1, [[PrimitiveValue]]: "a"}
VM420:210 String {0: "z", length: 1, [[PrimitiveValue]]: "z"}
VM420:210 String {0: "a", length: 1, [[PrimitiveValue]]: "a"}
VM420:210 String {0: "d", length: 1, [[PrimitiveValue]]: "d"}
VM420:210 String {0: "a", length: 1, [[PrimitiveValue]]: "a"}
VM420:210 String {0: "Z", length: 1, [[PrimitiveValue]]: "Z"}
VM420:210 String {0: "a", length: 1, [[PrimitiveValue]]: "a"}
VM420:210 String {0: "l", length: 1, [[PrimitiveValue]]: "l"}
VM420:210 String {0: "o", length: 1, [[PrimitiveValue]]: "o"}
VM420:210 String {0: "r", length: 1, [[PrimitiveValue]]: "r"}
VM420:210 String {0: "a", length: 1, [[PrimitiveValue]]: "a"}

Can you post what did you save to the localStorage and how? It looks like a human readable representation of a JSON object. — Eric Martinez
– Eric Martinez, Commented May 30, 2015 at 3:21
Unless you stored a string representation of JSON object in localStorage, there's no need to JSON.parse it. As Eric, said, please edit your question with the code and data that sets the localStorage so that we can see what's going on. — martynasma
– martynasma, Commented May 30, 2015 at 3:26
You're doing your console.log different than your JSON.parse... If your console.log works, seems like you should be doing JSON.parse(localStorage.getItem("fav")) — Seth McClaine
– Seth McClaine, Commented May 30, 2015 at 3:27

daxeh · Accepted Answer · 2015-05-30 03:37:27Z

1

TL;DR

ensure serialization/deserialization using JSON.stringify and JSON.parse()
ensure type is array and encoded before writing to localStorage

The following statement with JSON.parse() implies that localStorage["fav"] is encoded as JSON using JSON.stringify():

var savedMerchant = JSON.parse(localStorage.getItem("fav")); 
// access to localStorage using getItem() corrected from 
// @Seth McClaine in comments to question. Good spot!

So ensure that type you are encoding is also an object using typeof(x) === 'object' with x.isArray() to validate or debug before writing to localStorage.

Hope this helps.

edited May 30, 2015 at 3:37

answered May 30, 2015 at 3:25

daxeh

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