js-diff

A basic JavaScript object comparison script that will iterate, recursivly, through two JSON objects to compare differences.

This was built for a project in which I had a JSON object of user data that I cached on page load and compared against an edited version on save. I used this information to construct email summaries of changed behaviour as well as provide a detailed audit trail of actions.

Code

Code can be found under src at src/diff.js. That's all you need to worry about and the code has no dependencies on any library. NodeJS and all the other files are purely for running tests.

Params

obj1 and obj2 are two objects to be compared.

Return

Returns false if no differences are found. Returns an object if differences are found. The object will maintain path structure where the value fot he changed key/value pair is highlighted by from and to fields.

Example

var x = { name: 'omgaz', location: 'London' };
var y = { name: 'omgaz', location: 'Melbourne' };

getDiff(x, y);

// Returns object
{
  location: {
    from: 'London',
    to:   'Melbourne'
  }
}

Tests

If you'd like to run tests, check out the whole project. You'll need NodeJS installed. Tests use Karma and PhantomJS.

npm install
npm test