title: How to specify a file to heroku execute first
body: <p>Im using node,js and getting this LOG from heroku, i think it is a missing file that heroku didn't find. but in the Json file i put the main file to my index.js but still not working and do not see any post about it</p>
  <p><a href="https://i.stack.imgur.com/qAw2y.png" rel="nofollow noreferrer"></a></p>
  <pre><code>Build succeeded!
   !     This app may not specify any way to start a node process
         https://devcenter.heroku.com/articles/nodejs-support#default-web-process-type
  -----&gt; Discovering process types
         Procfile declares types     -&gt; (none)
         Default types for buildpack -&gt; web
  -----&gt; Compressing...
  </code></pre>
  <p><a href="https://i.stack.imgur.com/mMZQZ.png" rel="nofollow noreferrer">PACKAGE.JSON_IMAGE</a></p>