Mongoose is used for MongoDB connection, which is an elegant Node.js object data modeling (ODM) library for MongoDB.
We assume you already have installed MongoDB locally & its service is running. Now you need to connect to MongoDB so you need to install “mongoose” at the server side of Node.js application.
cd /mern-alfa/server/
npm install mongoose
Create a directory under the server directory named config and inside it, a file named db.js. In db.js we can add the following code to connect to our database:
import { connect } from "mongoose";
const connectDB = async () => {
try {
await connect("mongodb://localhost:27017/AlfaDb");
console.log("MongoDB Connected");
} catch (err) {
console.error(err.message);
process.exit(1);
}
};
export default connectDB;Then import the Mongodb connection to your /mern-alfa/server/server.js file
import connectDB from "./config/db.js";
Also call the connectDB() function as follow
// Connect to MongoDB
connectDB();Now stop your express server and start again, its will show “MongoDB Connected”
npm start
> server@1.0.0 start
> node server.js
Server running on port 5000
MongoDB Connected
For details please review code as follow
https://github.com/KoolMonk/mern-alfa/blob/master/server/config/db.js