JSFiddle - React, Tailwind, and code Playground

JavaScript

var o1 = {
    "customerId": "ABC",        
    "questions": [
        {
        "status": 2,
        "isBookmarked": 0,
        "questionId": 1 
        }
      ]      
    }
   

 var o2 = {
  "customerId": "ABC",    
  "questions": [
      {
      "status": 1,
      "isBookmarked": 1,
      "questionId": 2    
      },
      {
      "status": 1,
      "isBookmarked": 1,
      "questionId": 3    
      }
    ]   
  }
const o3 = Object.assign({}, o1, o2);

console.log(o3)