Promise.promisify is not a function
<p>I wrote JavaScript like this:</p>

<pre><code>var keys=null;
var promise=Promise.promisify(alchemyapi.keywords("url",myUrl,{},function(response) {
    var keywords = { url:myUrl, response:JSON.stringify(response,null,4), results:response['keywords'] };
                return keywords;
            }));
promise.then(
                (result)=&gt;{
                    var keys=result;
                    console.log(keys);
                },
                (error)=&gt;console.log(error)
            );
</code></pre>

<p>I'm using AlchemyAPI and trying to store data I got into my database
How should I do?</p>