Use bitly to generate a short URL with jQuery.

shortenUrl (jQuery)

// Generate Access Token
// https://bitly.com/a/oauth_apps

var shortenUrl = function(accessToken, longUrl) {
  $.getJSON('https://api-ssl.bitly.com/v3/shorten', {
    access_token: accessToken,
    longUrl: longUrl
  })
  .success(function(resp) {
    console.log('URL: ', resp.data.url);
  })
  .error(function(err) {
    console.error(err);
  });
};