Node.js Simple Login System

This is a simple login system built with Node.js. It uses express for the server, ejs as the view engine, and various authentication-related dependencies to handle user login and sessions.

NOTE: Database isn't setup. Login Credentials are stored in local storage

Dependencies

• express
• ejs
• bcrypt
• passport
• passport-local
• express-session
• express-flash
• dotenv

Installation

1. Clone the repository:

   git clone https://github.com/your-username/nodejs-simple-login-system.git

2. Navigate to the project directory:

   cd nodejs-simple-login-system

3. Install the dependencies:

   npm install

4. Create a .env file in the root of the project and add your session secret:

   SESSION_SECRET=any_secret_key
   

5. Start the server:

   npm start

6. Open your browser and navigate to:

   http://localhost:3000
   

How It Works

Express

express is a minimal and flexible Node.js web application framework. It provides a robust set of features to develop web and mobile applications.

• Usage in your code:

  const express = require('express');
  const app = express();
  app.use(express.urlencoded({ extended: false }));

EJS

ejs (Embedded JavaScript templates) is a simple templating language that lets you generate HTML markup with plain JavaScript.

• Usage in your code:

  app.set('view engine', 'ejs');

Bcrypt

bcrypt is a library to help you hash passwords. It uses the bcrypt hashing function to securely hash user passwords before storing them in the database.

• Usage in your code:

  const bcrypt = require('bcrypt');
  const hashedPassword = await bcrypt.hash(password, 10);

Passport and Passport-Local

passport is authentication middleware for Node.js, while passport-local is a Passport strategy for authenticating with a username and password.

• Usage in your code:

  const passport = require('passport');
  const LocalStrategy = require('passport-local').Strategy;
  
  passport.use(new LocalStrategy(
      function(username, password, done) {
          // Authentication logic here
      }
  ));

Express-Session

express-session is a middleware to handle sessions in your application. It stores session data on the server and gives the client a session ID to identify their session.

• Usage in your code:

  const session = require('express-session');
  app.use(session({
      secret: process.env.SESSION_SECRET,
      resave: false,
      saveUninitialized: false
  }));

Express-Flash

express-flash is a flash message middleware for Express. It provides a way to display messages to the user after a redirect.

• Usage in your code:

  const flash = require('express-flash');
  app.use(flash());

Dotenv

dotenv is a module that loads environment variables from a .env file into process.env.

• Usage in your code:

  require('dotenv').config();

Conclusion

This simple login system provides the basic structure for handling user authentication in a Node.js application. By leveraging the above-mentioned dependencies, you can easily extend and customize it to fit your specific needs.

Contribution

Feel free to fork this project, make improvements, and send a pull request. Any contributions are welcome!

License

This project is licensed under the MIT License. See the LICENSE file for more details.