title: how to handle Uncaught (in promise) TypeError: Cannot read properties of undefined (reading
body: <p>I want to handle Uncaught (in promise):</p>
  <blockquote>
  <p>TypeError: Cannot read properties of undefined (reading) this error in javascript. I want to alert if this type of error occurs....</p>
  </blockquote>
  <p>How to do this in javascirpt ??</p>
  <pre><code>         if(typeof( dataName) === undefined)
                  {
                      alert(&quot;undefined&quot;)
                  }
  </code></pre>
  <p><a href="https://i.stack.imgur.com/IriTL.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/IriTL.png" alt="enter image description here" /></a></p>