Stop original Object reference from updating in javascript

Question

I have a object contains some companies name. when I am doing changes in var m which is copy of var j then var j is also updating. How can we prevent that

var j= {'a':'tata','b':'suzuki'}
var m= j
m.a='bmw'
console.log(m)
console.log(j)

Answer 1

var j= {'a':'tata','b':'suzuki'}
var clone = JSON.parse(JSON.stringify(j)); // or var clone = jQuery.extend({}, j);
//m.a='bmw'
clone.a = 'jaguar';
console.log(clone);
console.log(j);