IsConnected not a function in next.js app

Working with Data Node.js Frameworks
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For that problem, the standard solution is to import clientPromise because versions higher than 3.9/4.0 do not have "import {Mongoclient} " command.

Then also, if you want to use {MongoClient} then,

  1. stop the current running server
  2. Type ‘npm i mongodb@3.5.9’ in terminal
  3. Restart your server by ‘npm/yarn run dev’

Now it will work