In this post, I will tell you about how to Check If Sharepoint List Already Exists In A Site Using JSOM.Steps
Open your Notepad.
Copy the code given below and paste it.
Name it spvalidation.js.
Add Content Editor Webpart in your page.
Add saved.js file into your Webpart properties.
SharePoint-2013-Hosting1

I hope it works for you!

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