How i used closures to implement user authentication in javascript

Introduction

In today's digital age, user authentication is a crucial aspect of web application development. It ensures that only authorized users can access restricted areas or perform specific actions. In this blog post, we'll explore how to implement a basic user authentication system in JavaScript. We'll walk through the code step-by-step, explaining each section along the way.

Implementation

To implement user authentication, we'll use a combination of JavaScript and the Node.js readline module. JavaScript provides the functionality to create objects and handle logic, while Node.js allows us to interact with the command-line interface for user input.

function User() {
  var username, password;

  function doLogin(usr, pswd) {
    // Logic for login
  }

  var publicAPI = {
    login: doLogin,
  };

  return publicAPI;
}

var fred = User();

const readline = require("readline");
const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
});

rl.question("Enter your username: ", (user_name) => {
  rl.question("Enter your password: ", (user_pass) => {
    fred.login(user_name, user_pass);
    rl.close();
  });
});

console.log();

User Function: We start by defining a function called User that represents our user authentication system. Inside this function, we declare private variables username and password.
doLogin Function: Within the User function, we define another function called doLogin. This function handles the login process. We'll add the login logic in the upcoming sections.
Public API: To expose the doLogin function outside the User function, we create an object named publicAPI with a property login pointing to the doLogin function. This allows external code to access the login functionality.
Creating an Instance: We create an instance of the User object by calling var fred = User();. This gives us access to the doLogin function through the fred object.
User Input: We import the readline module and create an interface (rl) to interact with the command-line interface. We prompt the user to enter their username and password using rl.question.
Calling doLogin: Once the user provides their credentials, we call fred.login(user_name, user_pass); to initiate the login process.
Closing the Interface: Finally, we close the readline interface using rl.close();.

Conclusion

In this blog post, we explored how to implement a basic user authentication system in JavaScript. We examined the code step-by-step, understanding each section's purpose and functionality. With this foundation, you can further enhance the system by integrating a database, adding encryption, or implementing more secure authentication techniques.

User authentication is a critical aspect of web application development, ensuring the protection of sensitive user information and maintaining system integrity. By understanding the fundamentals, you can build robust and secure authentication systems for your applications.

Stay tuned for future blog posts, where we'll explore advanced authentication techniques, security best practices, and more!

How i used closures to implement user authentication in javascript

Implementing User Authentication in JavaScript

Introduction

Implementation

Conclusion