How do I store an array in localStorage? [duplicate]

If I didn't need localStorage, my code would look like this:

var names=new Array(); 
names[0]=prompt("New member name?");

This works. However, I need to store this variable in localStorage and it's proving quite stubborn. I've tried:

var localStorage[names] = new Array();
localStorage.names[0] = prompt("New member name?");

Where am I going wrong?

localStorage only supports strings. Use JSON.stringify() and JSON.parse().

var names = [];
names[0] = prompt("New member name?");
localStorage.setItem("names", JSON.stringify(names));

//...
var storedNames = JSON.parse(localStorage.getItem("names"));

You can also use direct access to set/get item:

localstorage.names = JSON.stringify(names);
var storedNames = JSON.parse(localStorage.names);

The localStorage and sessionStorage can only handle strings. You can extend the default storage-objects to handle arrays and objects. Just include this script and use the new methods:

Storage.prototype.setObj = function(key, obj) {
    return this.setItem(key, JSON.stringify(obj))
}
Storage.prototype.getObj = function(key) {
    return JSON.parse(this.getItem(key))
}

Use localStorage.setObj(key, value) to save an array or object and localStorage.getObj(key) to retrieve it. The same methods work with the sessionStorage object.

If you just use the new methods to access the storage, every value will be converted to a JSON-string before saving and parsed before it is returned by the getter.

Use JSON.stringify() and JSON.parse() as suggested by no! This prevents the maybe rare but possible problem of a member name which includes the delimiter (e.g. member name three|||bars).

How do I store an array in localStorage? [duplicate]

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