diffutil

diffutil compares two objects and extracts the differences. It supports different result structure in order to use for Restful APIs, or MongoDB patches and etc.

Install

npm install diffutil

Features

• Get the structural differences between two objects.
• Observe the structural differences between two objects.
• Supports different result structure based on different needs such as Restful APIs, or MongoDB patches.

Importing

nodejs

var diff = require('diffutil')
// or:
// const diff = require('diffutil');
// const { diff } = require('diffutil');
// es6+:
// import diff from 'diffutil';

Examples

You can find more samples in main.test.ts.

const {diff} = require('./main');

let _id = new ObjectId();
let oldDoc = {_id, month: "may"};  
let newDoc = {_id, month: "april"};  
let result = diff(oldDoc, newDoc);
// result :  [{query: {_id}, update: {$set: {month: "april"}}}]

Arrays update

let _id = new ObjectId();
let oldDoc = {_id, addresses: [{_id: item1Id, city: "London"}]};
let newDoc = {_id, addresses: [{_id: item1Id, city: "Sydney"}, {_id: item2Id, city: "Paris"}]};

let result = diff(oldDoc, newDoc);
// result :   
//    [{
//      query: {_id},
//      update: {
//           $set: {"addresses.$[item1].city": "Sydney", "addresses.$[item2]": {_id: item2Id, city: "Paris"}},
//      },
//      options: {
//        arrayFilters: [{"item1._id": item1Id}, {"item2._id": item2Id}]
//      }
//   }];