How can I count how many different values I have in 1 localstorage key.

For example:

This is my localstorage:

[{"id":"item-1","icon":"google"},{"id":"item-2","icon":"youtube"}]

For this example I'd like an alert of 2 different values. So basically I want to count the {}..

Is that possible?

How can I count how many different values I have in 1 localstorage key.

For example:

This is my localstorage:

[{"id":"item-1","icon":"google.com"},{"id":"item-2","icon":"youtube.com"}]

For this example I'd like an alert of 2 different values. So basically I want to count the {}..

Is that possible?

• javascript
• jquery
• local-storage

3 Answers 3

localStorage is an object, so just localStorage.length gives you the number of entries.

However I think I might be misunderstanding you. Do you mean you have one key, and that key's value is a JSON.stringify'd object? If so, you could do JSON.parse(localStorage.keyname).length to unserialise the value and count how many there are in there.

Your object is saved as an array so just using the .length should give you the number of {} pairs you have. Try this (replace "whatever" with the name of your array:

var something = localstorage.whatever[];
var length = something.length;
alert("length = " + length);

This will return the number of items in the key for you

testing = JSON.parse(localStorage.getItem(KEYNAMEHERE));

//Lets count how many we have back
obj = eval('(' + testing + ')');

//And the total is...
objCount=0;
for(_obj in obj) objCount++;

alert(objCount)