Day 1: Overview of Express.js

• Introduction to Express.js
• Advantages of using Express.js over Node.js alone
• Setting up a basic Express.js application

Day 2: Setting Up an Express Project

• Creating a new Express application
• Understanding the project structure
• Using npm to manage dependencies

Day 3: Understanding the Request-Response Cycle

• Exploring HTTP requests and responses
• Overview of middleware in Express.js
• Handling different types of HTTP methods (GET, POST, PUT, DELETE)

Day 4: Creating Routes

• Defining routes in Express
• Handling multiple routes and route parameters
• Using query strings in routes

Day 5: Middleware Functions

• Introduction to middleware and its purpose
• Built-in middleware functions in Express
• Creating custom middleware for logging and error handling

Day 6: Templating Engines

• Introduction to templating engines (e.g., EJS, Pug)
• Setting up a templating engine in Express
• Creating dynamic views with template variables

Day 7: Static Files and Assets

• Serving static files (CSS, JavaScript, images)
• Using the express.static middleware
• Organizing project files for static assets

Day 8: Managing User Sessions

• Introduction to sessions in web applications
• Using Express-session for session management
• Storing session data and managing user state

Day 9: User Authentication

• Overview of user authentication concepts
• Setting up Passport.js for authentication
• Implementing local authentication strategy

Day 10: Securing Routes

• Protecting routes with authentication
• Role-based access control (RBAC) basics
• Handling unauthorized access and redirects

Day 11: Advanced Routing Techniques

• Router module for modularizing routes
• Nested routes and route grouping
• Parameterized routes and route handlers

Day 12: Building RESTful APIs

• Principles of RESTful architecture
• Creating a RESTful API with Express
• Defining and implementing RESTful routes (CRUD operations)

Day 13: Data Validation and Sanitization

• Importance of data validation and sanitization
• Using libraries like Joi for validation
• Implementing validation middleware in routes

Day 14: Error Handling in Express

• Understanding error handling in Express applications
• Creating custom error handling middleware
• Best practices for handling errors and sending responses

Day 15: Using Third-party APIs

• Making HTTP requests to external APIs (using Axios or Fetch)
• Handling API responses and errors
• Integrating data from external APIs into your application

Day 16: Connecting to MongoDB

• Setting up MongoDB with Mongoose
• Defining Mongoose models and schemas
• Establishing a connection to the database

Day 17: Performing CRUD Operations

• Implementing Create, Read, Update, Delete operations with Mongoose
• Using Express routes to handle database interactions
• Error handling for database operations

Day 18: Unit Testing Express Applications

• Importance of testing in web applications
• Setting up a testing environment with Mocha and Chai
• Writing unit tests for routes and middleware

Day 19: Performance Optimization Techniques

• Best practices for optimizing Express applications
• Caching strategies for improved performance
• Using compression middleware for response size reduction

Day 20: Deployment Strategies

• Preparing your Express application for deployment
• Deploying on platforms like Heroku and AWS
• Understanding environment variables and configuration management