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How to set the document value type in MongoDB using NodeJS ?
  • Last Updated : 16 Feb, 2021

Mongoose.module is one of the most powerful external module 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).

Value Type: Mongoose module allows us to add value type to the collection of MongoDB means String and Number data type. This makes the schema of collection rigid.

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

Example 1: Inserting wrong document value.

Filename- index.js

Javascript




// 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
collections
  .create({
  
    // Inserting value of only one key
    name: "GFG",
    marks: "10q0", // Inserting wrong value
  })
  .then((ans) => {
    console.log(ans);
  })
  .catch((err) => {
    console.log(err.message);
  });

Run index.js file using below command:

node index.js

Console Output:



Example 2:

Filename- index.js: Inserting valid value.

Javascript




// 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
collections
  .create({
  
    // Inserting value of only one key
    name: "GFG",
    marks: "1000",
  })
  .then((ans) => {
    console.log(ans);
  })
  .catch((err) => {
    console.log(err.message);
  });

Run index.js file using below command:

node index.js

Console Output:


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