Default Value in MongoDB using Node.js

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

Default Value: This value is entered when no value is entered as a value of the field in the collection.

Installing Module:

npm install mongoose

Project Structure:

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

mongod --dbpath=data --bind_ip 127.0.0.1

Filename- index.js:

Javascript

// Importing mongoose module
const mongoose = require("mongoose");
 
// Database Address
const url = "mongodb://localhost:27017/GFG";
 
// Connecting to database
mongoose
  .connect(url)
  .then((ans) => {
    console.log("Connected Successful");
  })
  .catch((err) => {
    console.log("Error in the Connection");
  });
 
// Schema class
const Schema = mongoose.Schema;
 
// Creating Structure of the collection
const collection_structure = new Schema({
  name: {
    type: String, // String type
    required: true,
  },
  marks: {
    type: Number, // Number type
    default: 100,
  },
});
// Creating collection
const collections = mongoose.model("GFG2", collection_structure);
 
// Inserting one document
collections
  .create({
 
    // Inserting value of only one key
    name: "aayush",
  })
  .then((ans) => {
    console.log(ans);
  })
  .catch((err) => {
    console.log(err.message);
  });