Mongoose Setup in Node application

Mongoose is an Object Data Modeling(ODM) library for MongoDB that helps to manage the application’s data.

General terms of MongoDB

• Database — Can contain one or more collections.
• Collection — Can contain one or more documents.
• Document — Key/Value pair list or array of nested documents.
• Schema — Specific data structure of a document.
• Model — Constructor that takes a specific schema and creates an instance of a document. Models are responsible for creating and reading documents.

Install Mongoose:

npm install mongoose

For connection with mongoose you need to mongodb+srv url by using cloud mongoose(Atlas).

You need to atlas account ( Cluster setup ) to access this mongodb+srv url by click connect button then select Connect with application and copy mongodb+srv url.

Install dotenv:

npm install dotenv

Create config.env file and add your DB url and password:

DB=mongodb+srv://userName:<password>@cluster2.pxessg1q.mongodb.net/?retryWrites=true&w=majority
DB_PASSWORD=userpassword

Connect to a MongoDB database add this code in main server.js or index.js:

const mongoose = require("mongoose");

// access env file variables
dotenv.config({ path: "./config.env" });

// get mongodb+srv url with password
let URL = process.env.DB.replace("<password>", process.env.DB_PASSWORD);

mongoose
  .connect(URL, {
    useNewUrlParser: true
  })
  .then((cc) => {
    console.log("DB Connection Successfull");
  });

Create a Mongoose userModel file inside model folder:

const validator = require("validator");
const UserSchema = new mongoose.Schema({
  name: {
    type: String,
    required: true
  },
  email: {
    type: String,
    required: [true, "Please provide your email"],
    unique: true,
    lowercase: true,
    validate: [validator.isEmail, "Please provide a valid email"]
  }
});

const User = mongoose.model("User", UserSchema);
module.exports = User;

Use Mongoose methods to interact with your database:

const User = require("/models/userModel");
let userData = {
   name:'myhackinf',
   email:'myhackinfo@gmail.com'
}

// create user using userData
const userCreate = await User.create(userData);

// access user data using find method of mongoose
const users = await User.find();

For more info here is mongoose doc url