Get nested object value in javascript or JSON

readme.md

sandbox

https://stackblitz.com/edit/js-nbdnkh?file=index.js

preview

https://js-nbdnkh.stackblitz.io/

index.js

const getValue = (path, obj) => {
  const newPath = path.replace(/\]/g, '');
  const arrayPath = newPath.split(/[\[\.]+/) || newPath;
  return arrayPath.reduce((obj, k) => (obj ? obj[k] : obj), obj);
};

const doFilterObject = (rawData, filterKey) =>
  filterKey.reduce((acc, cur) => {
    const isNested = new RegExp(/\[|\./, 'g').test(cur);
    const newData = isNested ? getValue(cur, rawData) : rawData[cur];
    acc = { ...acc, [cur]: newData };
    return acc;
  }, {});

// example data
const data = {
  id: 123123,
  service: 'fast_logistic',
  address: {
    sender: { city: 'yogyakarta', postalCode: 55511 },
    receiver: { city: 'jakarta', postalCode: 59888 },
  },
  items: [
    { name: 'phone', description: 'to make a call' },
    { name: 'laptop', description: 'to work' },
  ],
};
const filterKey = ['id', 'address.sender.city', 'items[0].description'];

// result
const result = doFilterObject(data, filterKey);
console.log(result); // {id: 123123, address.sender.city: "yogyakarta", items[0].description: "to make a call"}