Nir Adler

Posted on Dec 9, 2022 • Originally published at blog.niradler.com on Feb 11, 2020

Javascript object reamp

in my daily job as a full stack js developer I often need to manipulate js objects, either remove fields or transform to a new structure etc.

I decided to create an npm module object-remap, to make this repeated task more reliable, reduce code, and create cleaner code.

let's look at the examples:

const objectRemap = require("object-remap");

const obj = {
  a: 1,
  b: 2,
  c: 3,
  d: {
    e: 4,
    f: [1, 2, 3]
  }
};

//simple usage
const fields = ["a", "b", "c"];

let newObj = objectRemap(obj, fields);
console.log({ obj, newObj });
/*
{
  obj: { a: 1, b: 2, c: 3, d: { e: 4, f: [Array] } },
  newObj: { a: 1, b: 2, c: 3}
}
*/

//advance usage
const fieldsMap = [
  {
    origin: "a",
    target: "a"
  },
  {
    origin: "d.e",
    target: "e"
  },
  {
    origin: "d.f",
    target: "f",
    formatter: data => `${data.length} items`
  }
];

newObj = objectRemap(obj, fieldsMap);
console.log({ obj, newObj });
/*
{ 
  obj: { a: 1, b: 2, c: 3, d: { e: 4, f: [Array] } },
  newObj: { a: 1, e: 4, f: '3 items' } 
}
*/

for getting started install the package with npm: