var jsdiff = require('diff');

var one = 'beep boop';
var other = 'beep boop blah';
var diff = jsdiff.diffChars(one, other);

diff.forEach(function(part){
  if (part.added) {
      console.log("Added Word => " + part.value);
    } else if (part.removed) {
      console.log("Removed Word => " + part.value);
    }
});

// result from command line:
// Added Word =>  blah