What is problem coming after running app.js?Showing error in MongoDB DNS ,hostname error ,I don’t what is these,What is DNS problem?

enter image description here
why this error is coming ??
I’ve ensured that MongoDB is properly started, but I’m still facing this error for the first time in a while. I’m relatively new to Node.js and MongoDB, and I’m having trouble pinpointing where exactly this error is coming from.

I’ve tried checking my MongoDB URI, network connectivity, and DNS configuration, but I’m not sure what I’m missing or if this is a system default issue.

Can someone please explain what might be causing this error and how I can resolve it? Any insights or guidance would be greatly appreciated. Thank you!