JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore.js"></script>

JavaScript

console.clear();

var obj = {
   	'ABC': {
        id: '123',
	    name: 'Sesame Street'
   	}, 
    'DEF': {
        id: '123',
	    name: 'Sesame Street'
	}, 
    'GHI': {
        id: '456',
	    name: 'Nowhere Street'
    }
};

console.log('Get length of obj', _.size(obj));

var arr = _.values(obj);
var newObj = arr.filter(function(item){
	return item.id === '123';
});

console.log('Get length of obj with id == 123',_.size(newObj));