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Discussion on: 3 ways to clone an object in Javascript

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Replies for: Good article but why is json not recommended? When i need deep copy its the only way right?

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Nithish Kumar • • Edited

There are lot of reasons . The main disadvantage is , JSON.stringify() converts Date objects to string. If the value of the key is undefined, when doing with JSON.stringify(), the key is lost. For example,

let obj1 = {
  date : new Date(),
  name : undefined
}
console.log(JSON.parse(JSON.stringify(obj1))  // would return {date: "2021-05..." }
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Notice that the name attribute(or key) is lost.
Also,, it causes performance issue. So developers prefer either JQuery or lodash to implement deep copy.