title: How to extract GET form data in Express.js
body: <p>The following code is my form html:</p>
  
  <pre><code>&lt;form method="get" action="new_name"&gt;
    &lt;input  type="name" required="" maxlength="50" name="username" &gt;
    &lt;button  type="submit"&gt;Go&lt;/button&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>This submit button produce <code>http://localhost:8080/new_name?username=hai</code></p>
  
  <p>How can I extract the value of <code>username</code> from the url in an Express server?</p>