https://github.com/theamnabb/mern-stack
Learn MERN
https://github.com/theamnabb/mern-stack
expressjs mongodb nodejs reactjs
Last synced: 2 months ago
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Learn MERN
- Host: GitHub
- URL: https://github.com/theamnabb/mern-stack
- Owner: theamnabb
- Created: 2025-01-20T17:40:35.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2025-05-29T19:14:26.000Z (about 1 year ago)
- Last Synced: 2025-06-14T11:45:05.942Z (12 months ago)
- Topics: expressjs, mongodb, nodejs, reactjs
- Language: JavaScript
- Homepage:
- Size: 4.03 MB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Node JS
## What is Node JS:
Node JS is runtime Environment for JavaScript.
Node.js is an open-source, cross-platform JavaScript runtime environment that executes JavaScript code outside a web browser. Built on Chrome's V8 engine, it enables server-side development with JavaScript.
## Installation:
- Go to the Node.js
- Download Node.js from the [official website](https://nodejs.org/).
- Download the Windows installer (LTS version recommended).
- Run the installer and follow the on-screen instructions.
- After installation, open the Terminal and verify the installation by running
```bash
node -v
npm -v
```
📌 NPM mean Node package Manager
## Helo World
- window
- npm package
- create script | start
## Modules
- require | import
- exports
- module.exports
## File System
- Create File (writeFileSyn | writeFile)
- Read File (readFileSyn | readFile)
- Save previous data with out over write (append)
- copy File
- Delete File (unlinksync)
- Create Folder
## Architecture | How NodeJS Works?
- Default Thread pool size is 4
- Max? = 8core cp = 8
```bash
const os = require('os');
console.log(os.cpus().length);
```
## Building HTTP Server
- Creating an HTTP web server using NodeJS
- Creating HTTP server using NodeJS.
- Handling requests and sending responses in NodeJS
- Setting up a callback function for starting the server
- Headers provide extra information about the request.
- Building HTTP Server in NodeJS
- Creating a log for web server requests
- Creating multiple pages using switch case on request URL.
- Always support non-blocking requests for better performance
```js
const myServer = http.createServer((req, res) => {
res.end('Hello, Node.js Server!')
});
// run on port
myServer.listen(8000, () => {
console.log('Server running at http://localhost:8000/');
});
```
## Handling URL's in NodeJS
## HTTP Methods
- **GET**
- Purpose: Retrieve data from the server without modifying it.
- Use Case: Fetching a webpage or retrieving data from an API.
- **POST**
- Purpose: Send data to the server to create or update a resource.
- Use Case: Submitting a form or uploading a file.
- **PUT**
- Purpose: Update or create a resource at a specified URL.
- Use Case: Replacing the data of an existing resource or creating a new resource.
- **PATCH**
- Purpose: Partially update a resource.
- Use Case: Updating a specific field of a resource.
- **DELETE**
- Purpose: Remove a resource from the server.
- Use Case: Deleting a user or post.
# Express JS
Express.js is a minimalist web application framework for Node.js. It is designed to simplify the process of building robust and scalable server-side applications. It allows developers to create web applications, RESTful APIs, and more, efficiently and with less boilerplate code.
### How to Install Express.js?
- Install Node.js from Node.js official site.
- Use npm to install Express in your project:
```bash
npm install express
```
## Basic Example
```js
const express = require('express');
const app = express();
// Define a route
app.get('/', (req, res) => {
res.send('Welcome to Express.js!');
});
// Start the server
const PORT = 3000;
app.listen(PORT, () => {
console.log(`Server is running on http://localhost:${PORT}`);
});
```
## How Versioning Works in NodeJS?
`^4.21.2`
## What is REST API?
In simple words, a **REST API** is a way for different applications to talk to each other over the internet. It uses standard rules (like HTTP) so that a client (like a website or app) can ask a server for information or send it data.
## Postman
Postman is a popular API testing tool that allows developers to build, test, and manage APIs. It provides a user-friendly interface for sending HTTP requests and analyzing responses, making it a valuable tool for working with RESTful, GraphQL, and other web APIs.
## MongoDB
- install MongoDB
- install MongoDB Shell
```js
1. mongod --version
2. mongosh
```
### Interact with mongoDB
```bash
show dbs
use
show collections
db.coll.find()
db.coll.insert()
```
### Shortner_URL
---
### Discord Bot
---
### Upload files by using Multer
## Upload files by using Multer
## Upload files by using Multer
# tha nks its work