JSFiddle - React, Tailwind, and code Playground

JavaScript

let localData = {
  name: '',
  sex: ''
}

let resData = {
  name: 'zzs',
  sex: 'boy',
  age: 18,
  birthday: '10-21',
  address: 'demo'
}

Object.keys(resData).filter(key => key in localData).forEach(key => localData[key] = resData[key]);
console.log(localData)