Getting a diff of two json-objects

Question

Scenario: I want a function that compares two JSON-objects, and returns a JSON-object with a list of the differences and if possible more data such as coverage metrics.

Answer 1

You can use rus-diff https://github.com/mirek/node-rus-diff which creates MongoDB compatible (rename/unset/set) diff:

// npm install rus-diff
var madrid = {"type":"team","description":"Good","trophies":[{"ucl":"10"}, {"copa":"5"}]};
var barca = {"type":"team","description":"Bad","trophies":[{"ucl":"3"}]};
var rusDiff = require('rus-diff').rusDiff
console.log(rusDiff(madrid, barca))

Outputs:

{ '$unset': { 'trophies.1': true },
  '$set': { description: 'Bad', 'trophies.0.ucl': '3' } }