custom toJSON example

toJSON.js

// custom toJSON example object
const a = {
  id: 1,
  name: 'ARIF',
  toJSON() {
    return JSON.stringify({id: this.id})
  }
}
const a = new A();
const b = {...a}
console.log(JSON.stringify(a))
console.log(JSON.stringify(b))

// custom toJSON example class
class A {
  constructor() {
    this.id = 1;
    this.name = 'ARIF'
  }

  toJSON() {
    return {id: this.id}
  }
}
const a = new A();
const b = {...a}
console.log(JSON.stringify(a))
console.log(JSON.stringify(b))