>>Hi,
>>
>>Say I have the following strings (serialized JSON) (Key and Value in the local storage (simplified):
>>
>>

>>"PM_ABCD","long string is here"
>>"PM_1233", "another long string here"
>>"ABC", "Another long string"
>>"PM_G134555","long string"
>>

>>
>>Can I get all keys - into an object - (without getting the Value) that start with a string "PM_"?
>
>As Rob says you will need to iterate localStorage:

String.prototype.startsWith = function(startText) {
>        return this.slice(0, startText.length) == startText;
>    };
>    
>    var pmKeys = new Array();
>    for (var x = 1; x < localStorage.length; x++) {
>        var s = localStorage.key(x);
>        if (s.startsWith("PM_")) {
>            pmKeys.push(s);
>        }
>    }

But it may be better to store all those items as an array of objects under one key.e.g:

var toStore = [
>    { Key: "PM_ABCD", Value: "long string is here" },
>    { Key: "PM_1233", Value: "another long string here" },
>    { Key: "ABC", Value: "Another long string here" },
>    { Key: "PM_G134555", Value: "long string" }
>];
>localStorage.setItem("MyList", JSON.stringify(toStore));

Then you can pull them back into an array which is easier to manipulate:

var myList = JSON.parse(localStorage.getItem("MyList"));
>var pmKeys = new Array();
>    myList.forEach(function(item) {
>        if (item.Key.slice(0, 3) == "PM_") {
>            pmKeys.push(item.Key);
>        }
>    });

I usually pull any stuff that I'm likely to need from localStorage into memory when the page loads.

Thank you very much for the code and the suggestion. I will have to try the approach of array of objects. But I should be able to delete or replace any one of the "items". For example, I should be able to remove the item "PM_1233" and the value or replace the Value of this key. So I will have to learn how to do it. Another concern I have is if there is enough capacity to store all the "data" I need to store in the localStorage. I read that local storage is limited to 5MB. I would have to run some tests to see if this is sufficient for the customer storage. I want to watch (later) a pluralsight course on IndexedDB. I know nothing about it now but would like to know if this is an alternative to a local storage with higher capacity.