title: How to check if name already exists? Azure Ressource Manager Template
body: <p>is it possible to <strong>check</strong>, in an ARM Template, <strong>if the name for my Virtual Machine already exists</strong>?</p>
  
  <p>I am developing a Solution Template for the Azure Marketplace. Maybe it is possible to set a paramter in the <strong>UiDefinition</strong> uniqe?</p>
  
  <p>The goal is to reproduce this green Hook</p>
  
  <p><a href="https://i.stack.imgur.com/BBA01.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BBA01.jpg" alt="enter image description here"></a></p>