This chapter introduces how JavaScript works with APIs, one of the most important skills for modern web developers.
API stands for Application Programming Interface. APIs allow your application to communicate with servers, databases, and external services to get or send data.
Almost every real-world application uses APIs — from loading user profiles and products to submitting forms, processing payments, and showing live data.
In this chapter, students will learn how to:
- Understand what APIs are and how they work
- Use fetch() to request data from servers
- Work with JSON data
- Send data using POST requests
- Handle API errors safely
- Build real-world features using API calls
By the end of this chapter, students will be able to connect their JavaScript applications to real data sources and build professional, data-driven web applications — a critical step toward becoming a job-ready developer.