Schema({
    property : {
        type: value
        // other options
        }
});

npm init

npm install mongoose

const mongoose = require('mongoose'); 
  
// Path to our cloud DataBase 
const url = 'mongodb://localhost:27017/GFG'
  
// Connecting to database 
mongoose.set('strictQuery', false); 
mongoose.connect(url) 
    .then((ans) => { 
        console.log("Connected Successful") 
    }) 
    .catch((err) => { 
        console.log("Error in the Connection") 
    }) 
  
// Calling Schema class 
const Schema = mongoose.Schema; 
  
// Creating Structure of the model 
const schema = new Schema({ 
    firstName: String, 
    lastName: String, 
    age: Number, 
    Gender: String, 
}); 
  
// Compile our model 
const Person = mongoose.model('Person', schema); 
  
// Inspecting the options using schema.path() function 
console.log('firstName property is :', 
    schema.path('firstName').instance); 
console.log('lastName property is :', 
    schema.path('lastName').instance); 
console.log('Age property is :', 
    schema.path('age').instance); 
console.log('Gender property is :', 
    schema.path('Gender').instance);

node app.js

firstName property is : String
lastName property is : String
Age property is : Number
Gender property is : String
Connected Successful

const mongoose = require('mongoose'); 
  
// Path to our cloud DataBase 
const url = 'mongodb://localhost:27017/GFG'
  
// Connecting to database 
mongoose.set('strictQuery', false); 
  
mongoose.connect(url) 
    .then((ans) => { 
        console.log("Connected Successful") 
    }) 
    .catch((err) => { 
        console.log("Error in the Connection") 
    }) 
  
// Creating Structure of the model 
const studentSchema = new mongoose.Schema({ 
    name: { type: String }, 
    rollNumber: { type: Number }, 
    class: { type: Number }, 
}); 
  
console.log('Name property accepts: ', 
    studentSchema.path('name').instance); 
console.log('Roll Number property accepts: ', 
    studentSchema.path('rollNumber').instance); 
console.log('Class property accepts: ', 
    studentSchema.path('class').instance);

node app.js

Name property accepts: String
Roll Number property accepts: String
Class property accepts: Number
Connected Successful