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MongoDB Required Constraint using Node.js

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Mongoose module is one of the most powerful external modules of the node.js.Mongoose is a MongoDB ODM i.e (Object database Modelling) that used to translate the code and its representation from MongoDB to the Node.js server. Mongoose module provides several functions in order to manipulate the documents of the collection of the MongoDB database (Refer this Link)

Required Constraint: This constraint does not allow to skip the value of a particular key in the document of MongoDB collection. This constraint same as a not-null constraint in MySQL.

Installing Module: Install the required module using the following command.

npm install mongoose

Project Structure: Our project structure will look like this.

Running Server on Local IP: Data is the directory where MongoDB server is present.

mongod --dbpath=data --bind_ip


// Importing mongoose module
const mongoose = require("mongoose")
// Database Address
// Connecting to database
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 collection
const collection_structure = new Schema({
  name: {
    type: String,
    required: true
  marks: {
    type: Number
// Creating collection
const collections = mongoose.model("GFG2", collection_structure)
// Inserting one document
  // Inserting value of only one key
  marks: 3
}).then((ans) => {
}).catch((err) => {

Run index.js file using below command:

node index.js

Console output:

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Last Updated : 04 Mar, 2021
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