1. install mongoose
                    
            npm install mongoose --save
                    
                
  2. add mongoose in database.js
                        
                            const mongoose = require('mongoose');
                    
                    
                    
                        const mongoose = require('mongoose');const mongoURL="mongodb://localhost:27017/react"const connectToMongoDB=()=>{
       
            mongoose.connect(mongoURL).then(()=>console.log('success')).catch(err => console.log(err));
                
    }
    module.exports=connectToMongoDB;
                    
                
  3. call fuction in index.js
                    
                        const connectToMongoDB =require('./db')                    connectToMongoDB()
                    
                
  4. create schema
                    
    const mongoose = require("mongoose");
    const { Schema } =mongoose;
    const UserSchema = new mongoose.Schema({
      name: {
        type: String,
        required: true,
      },
      email: {
        type: String,
        required: true,
        unique: true,
      },
      password: {
        type: String,
        required: true,
      },
      date: {
        type: Date,
        default: Date.now,
      },
    });                
                
  5. complie schema in model
                    
                        const Kitten = mongoose.model('Kitten', kittySchema);
                    
                
  6. use model to take new input
                    
                        const silence = new Kitten({ name: 'Silence' });
                        console.log(silence.name);