How to make an object counter in localStorage?

Question

JavaScript

Hello everyone, in general, you need to write an array of objects in localStorage, how to make sure that every time the page is updated, a counter property is created in the object, instead of adding to the previous array.
So that when the page is updated, let's say three times it was not so in localStorage -

[{"id":1,"obj_id":234,"count":0},{"id":1,"obj_id":234,"count":0},{"id":1,"obj_id":234,"count":0}]

And so [{"id":1,"obj_id":234,"count":3}]
That is, the value of the count property changed every time the page was updated
https://jsfiddle.net/m3L287gd/

Answer 1

var keyName = 'my_counter'
var emptyCounter = [{"id":1,"obj_id":234,"count":0}]
var myObject = JSON.parse(localStorage.getItem(keyName)) || emptyCounter
myObject[0].count++
localStorage.setItem(keyName, JSON.stringify(myObject));

https://jsfiddle.net/ctpsxzan/