e: '2016-02-11'
});

tone_analyzer.tone({ text: 'Greetings from Watson Developer Cloud!' },
  function(err, tone) {
    if (err)
      console.log(err);
    else
      console.log(JSON.stringify(tone, null, 2));
});</code></pre><h3>Tradeoff Analytics</h3><p>Use the <a href="http://www.ibm.com/smarterplanet/us/en/ibmwatson/developercloud/doc/tradeoff-analytics/">Tradeoff Analytics</a> service to find the best
phone that minimizes price and weight and maximizes screen size.</p>
<pre class="prettyprint source 