Connecting Deno Backend to MongoDB - mongodb

I am new to Deno. I was following a tutorial and I was learning about how to connect my Deno backend to MongoDB. If I am honest the Tutorial I am watching right is a little bit old and so many things changed since the video came out. Can someone help how I can connect to my MongoDB database?
Thank you
I tried to use dataAPI based on this struction but when I tried it with postmen the response I got was the URL is not found. And that was weird for me apparently the article is new. I tried to use MongoClient. But again I wasn't successful.

After talking to the Deno Discord community I understand that you need to add a couple of things. The URL that mongo would generate for you is something like this:
mongodb+srv://<username>:<password>#<cluster>/?retryWrites=true&w=majority.But your URL should be something like this: mongodb+srv://${user}:${pass}#${cluster}/?retryWrites=true&w=majority&authMechanism=SCRAM-SHA-1&authSource=admin.Again I really want to thank the Deno community, They are really fun to work with.

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here's a gist of what I have
https://gist.github.com/759446
I've dumbed it down to almost nothing in the middleware.
When I start the server, res.myvar is correctly set to "object" in the first request. Every subsequent request fails with res.myvar being "undefined".
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