A Node.js library which you can use to get the sum of two numbers of any size.
With npm:
npm i @rasta-alex/bigNumbers
const bigNumbers = require('@rasta-alex/bigNumbers');
const number = bigNumbers('123', '321'); // '444';
const bigNum = bigNumbers(Array(100).fill('1'), Array(100).fill('2'));
// Array(100).fill('3').join('').toString()MIT