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Steps to Setup the Project

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Sorting in ascending order using IDs

Step 1: Create a nodeJS folder by using this command

mkdir mypp

Step 2: Navigate to the project directory

cd myapp

Step 3: Initialize the NodeJS project

npm init

Step 4: Install the necessary packages/libraries in your project using the following commands.

npm install mongoose express bcryptjs body-parser

Project Structure:

The updated dependencies in package.json file will look like:

"dependencies": {
    "bcryptjs": "^2.4.3",
    "body-parser": "^1.20.2",
    "express": "^4.19.2",
    "mongoose": "^8.4.1"
  }

MongoDB Database:

Following is the sample data stored in your database for this example.

How to do Pagination in Node.js using Sorting Ids ?

Implementing pagination in a Node.js application involves fetching and displaying data in chunks or pages, typically from a database. One common approach to pagination is using sorting IDs, where each record in the dataset is assigned a unique identifier (ID) that determines its position in the sorted sequence. This method allows you to efficiently retrieve data based on these IDs to implement pagination. Let’s dive into how you can achieve pagination using sorting IDs in a Node.js application.

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Approach

Sorting in the NodeJS helps to sort the results in ascending or descending order. We use the sort() method in which we pass one parameter that results in ascending or descending order. Use the value -1 in the sort object to sort descending and 1 to sort the object in the ascending order....

Steps to Setup the Project

Step 1: Create a nodeJS folder by using this command...

Sorting in ascending order using IDs

JavaScript // user.js let mongoose = require("mongoose"); let userSchema = new mongoose.Schema({ username:String, password:String }); module.exports = mongoose.model("User",userSchema); JavaScript // app.js const express = require('express'), Mongoose = require('mongoose'), Bcrypt = require('bcryptjs'), bodyParser = require('body-parser'), jsonParser = bodyParser.json(), User = require('./user') const app = express(); const db = `mongodb+srv://pallavi:pallavi123@ cluster0.k0sop.mongodb.net/user?retryWrites= true&w=majority` Mongoose.connect(db, { useNewUrlParser: true, useUnifiedTopology: true, useCreateIndex: true }).then(() => console.log('MongoDB Connected....')) // Handling GET /send Request app.get("/send", async (req, res, next) => { try { let { page, size, sort } = req.query; // If the page is not applied in query. if (!page) { // Make the Default value one. page = 1; } if (!size) { size = 10; } // We have to make it integer because // query parameter passed is string const limit = parseInt(size); // We pass 1 for sorting data in // ascending order using ids const user = await User.find().sort( { votes: 1, _id: 1 }).limit(limit) res.send({ page, size, Info: user, }); } catch (error) { res.sendStatus(500); } }); // Handling POST /send Request app.post('/send', jsonParser, (req, res) => { req.body.password = Bcrypt.hashSync(req.body.password, 10); var newUser = new User({ username: req.body.username, password: req.body.password, }) newUser.save() .then(result => { console.log(result); }); }) // Server setup app.listen(3000, function () { console.log("Express Started on Port 3000"); });...

Sorting in descending order using IDs

JavaScript // user.js let mongoose = require("mongoose"); let userSchema = new mongoose.Schema({ username:String, password:String }); module.exports = mongoose.model("User", userSchema); JavaScript // app.js let express = require('express'), Mongoose = require('mongoose'), Bcrypt = require('bcryptjs'), bodyParser = require('body-parser'), jsonParser = bodyParser.json(), User = require('./user') const app = express(); const db = `mongodb+srv://pallavi:pallavi123 @cluster0.k0sop.mongodb.net/user? retryWrites=true&w=majority` Mongoose.connect(db, { useNewUrlParser: true, useUnifiedTopology: true, useCreateIndex: true }).then(() => console.log('MongoDB Connected....')) // Handling GET /send Request app.get("/send", async (req, res, next) => { try { let { page, size, sort } = req.query; // If the page is not applied in query if (!page) { // Make the Default value one page = 1; } if (!size) { size = 10; } // We have to make it integer because // the query parameter passed is string const limit = parseInt(size); // We pass 1 for sorting data in // descending order using ids const user = await User.find().sort( { votes: 1, _id: -1 }).limit(limit) res.send({ page, size, Info: user, }); } catch (error) { res.sendStatus(500); } }); // Handling POST /send Request app.post('/send', jsonParser, (req, res) => { req.body.password = Bcrypt.hashSync(req.body.password, 10); let newUser = new User({ username: req.body.username, password: req.body.password, }) newUser. save() .then(result => { console.log(result); }); }) // Server setup app.listen(3000, function () { console.log("Express Started on Port 3000"); });...

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Approach

Sorting in ascending order using IDs