1//using mongoose
2npm i mongoose
3
4const mongoose = require("mongoose");
5
6mongoose
7  .connect(
8    "your mongodb URI",
9    {
10      useNewUrlParser: true,
11      useCreateIndex: true,
12      useFindAndModify: false,
13      useUnifiedTopology: true,
14    }
15  )
16  .then(() => console.log("mongodb connected"))
17  .catch((err) => {
18    console.err(err.message);
19    process.exit(1);
20  });

1npm install express --save