AJAX & JSON

Module 1: Introduction to AJAX

Fundamentals

• What is AJAX? (Asynchronous JavaScript and XML)

• How AJAX Works (XMLHttpRequest)

• Advantages of AJAX

• Traditional vs AJAX Web Applications

• Browser Support & Compatibility

Core Components

• XMLHttpRequest Object

• Ready States (0 to 4)

• Status Codes (200, 404, 500 etc.)

• Callback Functions

Module 2: Making AJAX Requests

Vanilla JavaScript AJAX

• Creating XMLHttpRequest Object

• GET vs POST Requests

• Handling Responses

• Error Handling

• Synchronous vs Asynchronous Requests

• Setting Request Headers

Fetch API (Modern Approach)

• Basic Fetch Syntax

• Handling Responses (.then, .catch)

• Async/Await with Fetch

• Request Options (method, headers, body)

• AbortController (Canceling Requests)

Module 3: Working with JSON

JSON Fundamentals

• What is JSON? (JavaScript Object Notation)

• JSON Syntax Rules

• JSON vs XML

• Data Types in JSON

• JSON Formatting & Validation

JSON Handling in JavaScript

• JSON.parse() (String to Object)

• JSON.stringify() (Object to String)

• Pretty Printing JSON

• Handling Circular References

• Reviver Function (Custom Parsing)

Module 4: AJAX with jQuery

jQuery AJAX Methods

• $.ajax() (Complete Configuration)

• Shorthand Methods ($.get, $.post)

• Loading HTML Content

• Global AJAX Events

• AJAX Setup ($.ajaxSetup)

Advanced jQuery AJAX

• Handling JSONP (Cross-domain Requests)

• AJAX Queue Management

• File Uploads via AJAX

• AJAX with Promises

Module 5: RESTful API Integration

Working with APIs

• Understanding REST API

• HTTP Methods (GET, POST, PUT, DELETE)

• API Authentication (API Keys, JWT)

• Handling CORS (Cross-Origin Resource Sharing)

• Error Handling Strategies

Practical API Projects

• Weather App (Fetching Live Data)

• Currency Converter

• News Feed Reader

• GitHub User Search

Module 6: Advanced AJAX Techniques

Performance Optimization

• Request Caching

• Debouncing & Throttling

• Lazy Loading Content

• Request Prioritization

Real-time Features

• Polling vs WebSockets

• Implementing Auto-Complete Search

• Infinite Scrolling

• Live Form Validation

Module 7: Security Considerations

• Same-Origin Policy

• CSRF Protection

• XSS Prevention

• Input Sanitization

• HTTPS Requirements

Module 8: Modern Alternatives

• Axios Library

• GraphQL with AJAX

• WebSockets vs AJAX

• Server-Sent Events (SSE)

Module 9: Debugging & Testing

• Browser Developer Tools

• Network Tab Analysis

• Mocking API Responses

• Unit Testing AJAX Code

• Error Tracking

Module 10: Projects & Case Studies

Practical Projects

1. Live Search Application

2. Dynamic Form Submission

3. Shopping Cart Updates

4. Dashboard with Auto-Refresh

Capstone Project

• Single Page Application (SPA)

  • Client-side Routing

  • Dynamic Content Loading

  • State Management

  • Offline Capabilities