JSFiddle - React, Tailwind, and code Playground

CSS

a

JavaScript

var array1 = [{'123': '18'}, {'578': '2'}, {'323': '5'}];
var array2 = [{'123': '18'}, {'323': '3'}, {'578': '1'}];
var diff = [];
var i = 0;

difference = $.grep(array1,function(x) {
    // console.log(x);
    return $.inArray(x, array2) < 0
})
console.log(difference);