A small library that will deep diff two JavaScript Objects, including nested structures of arrays and objects, and return the difference.
const lhs = { foo: { bar: { a: [1, 2], b: 2, c: ['x', 'y'], e: 100 // deleted } }, buzz: 'world' }; const rhs = { foo: { bar: { a: [1], // updated (value deleted) b: 2, // unchanged c: ['x', 'y', 'z'], // updated (value added) d: 'Hello, world!' // added } }, buzz: 'fizz' // updated }; console.log(diff(lhs, rhs)); /* logs: { foo: { bar: { a: { '1': undefined }, c: { '2': 'z' }, d: 'Hello, world!', e: undefined } }, buzz: 'fizz' } */