Forem: UiX Phuke

Express.js

UiX Phuke — Mon, 05 Aug 2024 23:20:01 +0000

What is Express?

Express.js, or simply Express, is a back end web application framework for building RESTful APIs with Node.js, released as free and open-source software under the MIT License. It is designed for building web applications and APIs. It has been called the de facto standard server framework for Node.js

initialisation:

npm init

installation of express:

npm install express --save

installation of nodemon

npm i nodemon

nodemon is a tool that helps develop Node.js based applications by automatically restarting the node application when file changes in the directory are detected.

Run express server on: localhost:3000

send json: localhost:3000/jsonexample

path is a inbuild module
we can call directories

params

The req.params property is an object containing properties mapped to the named route “parameters”. For example, if you have the route /student/:id, then the “id” property is available as req.params.id. This object defaults to {}.
http://localhost:3000/api/products/3

query
The req.query property allows you to access the query parameters from the URL of an incoming HTTP request. Query parameters are key-value pairs included in the URL after the “?” symbol, and they are separated by “&” symbols.
http://localhost:3000/api/v1/query?search=r&limit=2

Basic crud operation
modules

const express = require('express')
const app = express();

//app.use(express.json());

let books is a arr obj

let books = [
    {id:1,title:'Book 1',author: 'author 1'},
    {id:2,title:'Book 2',author: 'author 2'},
]

read

app.get('/', (req, res) => {
    res.json(books)
})

app.use(express.json())

create

app.post('/books', (req, res) => {
    console.log(req.body)
    const newBook = req.body;
    newBook.id = books.length + 1;
    books.push(newBook);
    res.status(201).json(newBook)

})

update/put

app.put('/books/:id',(req, res)=> {
    const id = parseInt(req.params.id)
    const updatedBooks = req.body
    const index = books.findIndex(book => book.id === id);

    if (index !== -1) {
        books[index] = { ...books[index], ...updatedBooks }
        res.json(books[index])
    }
    else {
        res.status(404).json({error: "book not found"})
    }

})

delete

app.delete('/books/:id', (req, res) => {
    const id = parseInt(req.params.id);
    const index = books.findIndex((book) => book.id === id);
    if (index !== -1) {
      const deletedBook = books[index];
      books.slice(index, 1);
      res.json(deletedBook);
    } else {
      res.status(404).json({ error: "book not found" });
    }
})

port

app.listen(3000, () => {
    console.log('server is running on port 3000')
})

but this is not a good way to operate CRUD operations
there is a better way
folder structure

index.js

const express = require('express')
const app = express();
const bookRoutes=require('./routes/bookRoutes')

app.use(express.json());
app.use('/',bookRoutes)

app.listen(3000, () => {
    console.log('server is running on port 3000')
})

bookController.js

let books = [
  { id: 1, title: "Book 1", author: "author 1" },
  { id: 2, title: "Book 2", author: "author 2" },
];

//read
const getBooks=(req, res) => {
  res.json(books);
}

//create
const createBooks= (req, res) => {
  console.log(req.body);
  const newBook = req.body;
  newBook.id = books.length + 1;
  books.push(newBook);
  res.status(201).json(newBook);
}

//update /put
const updateBooks= (req, res) => {
  const id = parseInt(req.params.id);
  const updatedBooks = req.body;
  const index = books.findIndex((book) => book.id === id);

  if (index !== -1) {
    books[index] = { ...books[index], ...updatedBooks };
    res.json(books[index]);
  } else {
    res.status(404).json({ error: "book not found" });
  }
}

//delete
const deleteBooks=  (req, res) => {
  const id = parseInt(req.params.id);
  const index = books.findIndex((book) => book.id === id);
  if (index !== -1) {
    const deletedBook = books[index];
    books.slice(index, 1);
    res.json(deletedBook);
  } else {
    res.status(404).json({ error: "book not found" });
  }
}

module.exports = {
    getBooks,createBooks,updateBooks,deleteBooks
}

bookRoutes.js

const express = require('express')

const bookController = require('../controllers/bookController')

const router = express.Router()

router.get('/books',bookController.getBooks)
router.post('/books',bookController.createBooks)
router.put('/books/:id',bookController.updateBooks)
router.delete('/books/:id', bookController.deleteBooks)

module.exports = router;

check out in github:

Express.js

UiX Phuke — Mon, 05 Aug 2024 23:19:57 +0000

What is Express?

initialisation:

npm init

installation of express:

npm install express --save

installation of nodemon

npm i nodemon

nodemon is a tool that helps develop Node.js based applications by automatically restarting the node application when file changes in the directory are detected.

Run express server on: localhost:3000

send json: localhost:3000/jsonexample

path is a inbuild module
we can call directories

params

Basic crud operation
modules

const express = require('express')
const app = express();

//app.use(express.json());

let books is a arr obj

let books = [
    {id:1,title:'Book 1',author: 'author 1'},
    {id:2,title:'Book 2',author: 'author 2'},
]

read

app.get('/', (req, res) => {
    res.json(books)
})

app.use(express.json())

create

app.post('/books', (req, res) => {
    console.log(req.body)
    const newBook = req.body;
    newBook.id = books.length + 1;
    books.push(newBook);
    res.status(201).json(newBook)

})

update/put

app.put('/books/:id',(req, res)=> {
    const id = parseInt(req.params.id)
    const updatedBooks = req.body
    const index = books.findIndex(book => book.id === id);

    if (index !== -1) {
        books[index] = { ...books[index], ...updatedBooks }
        res.json(books[index])
    }
    else {
        res.status(404).json({error: "book not found"})
    }

})

delete

app.delete('/books/:id', (req, res) => {
    const id = parseInt(req.params.id);
    const index = books.findIndex((book) => book.id === id);
    if (index !== -1) {
      const deletedBook = books[index];
      books.slice(index, 1);
      res.json(deletedBook);
    } else {
      res.status(404).json({ error: "book not found" });
    }
})

port

app.listen(3000, () => {
    console.log('server is running on port 3000')
})

but this is not a good way to operate CRUD operations
there is a better way
folder structure

index.js

const express = require('express')
const app = express();
const bookRoutes=require('./routes/bookRoutes')

app.use(express.json());
app.use('/',bookRoutes)

app.listen(3000, () => {
    console.log('server is running on port 3000')
})

bookController.js

let books = [
  { id: 1, title: "Book 1", author: "author 1" },
  { id: 2, title: "Book 2", author: "author 2" },
];

//read
const getBooks=(req, res) => {
  res.json(books);
}

//create
const createBooks= (req, res) => {
  console.log(req.body);
  const newBook = req.body;
  newBook.id = books.length + 1;
  books.push(newBook);
  res.status(201).json(newBook);
}

//update /put
const updateBooks= (req, res) => {
  const id = parseInt(req.params.id);
  const updatedBooks = req.body;
  const index = books.findIndex((book) => book.id === id);

  if (index !== -1) {
    books[index] = { ...books[index], ...updatedBooks };
    res.json(books[index]);
  } else {
    res.status(404).json({ error: "book not found" });
  }
}

//delete
const deleteBooks=  (req, res) => {
  const id = parseInt(req.params.id);
  const index = books.findIndex((book) => book.id === id);
  if (index !== -1) {
    const deletedBook = books[index];
    books.slice(index, 1);
    res.json(deletedBook);
  } else {
    res.status(404).json({ error: "book not found" });
  }
}

module.exports = {
    getBooks,createBooks,updateBooks,deleteBooks
}

bookRoutes.js

const express = require('express')

const bookController = require('../controllers/bookController')

const router = express.Router()

router.get('/books',bookController.getBooks)
router.post('/books',bookController.createBooks)
router.put('/books/:id',bookController.updateBooks)
router.delete('/books/:id', bookController.deleteBooks)

module.exports = router;

check out in github:

About Driver.js

UiX Phuke — Thu, 18 Jul 2024 08:25:51 +0000

TLDRDriver.js is a lightweight, highly customizable, and dependency-free JavaScript library designed to support all major browsers and mobile devices. It helps in user onboarding, feature highlighting, and providing contextual help. Written in TypeScript and MIT Licensed, it has millions of downloads and is used globally by various companies.

Installation:
Run one of the following commands to install the package:

# Using npm
npm install driver.js

# Using pnpm
pnpm install driver.js

# Using yarn
yarn add driver.js

MCA or SAAS Product by feb 2025

UiX Phuke — Wed, 17 Jul 2024 12:23:33 +0000

Hey there…
I know that I’m new to you guys….
I think that i’m taking a big risk in my life… in 2024 I graduated CS degree with 8.21 CGPA. But what matters … this cgpa not gonna help me anyway … during this degree i sidly associated with web dev… due to lack of consistency… i think i could not made it as i want … so, I’m thinking that rather go for MCA and wasting money… may i become a self-taught MERN stack developer by December 2024.

And build a SAAS product …. And also some full stack project.. so company gets to know my skill… and if i get internship somewhere!!!

What u say…
Should i go gor MCA
or a build a SAAS product which may implement by feb 2025.