Working with Data
Learn how async JavaScript, fetch(), JSON, and DOM rendering fit together in real browser-based features.
How to use this section
This builder-path section turns JavaScript data work into something practical. You will move from Promises and request flow to parsing JSON, cleaning API data, and shipping a small live-data interface without hiding the moving parts.
Lessons in this section
Introduction to Async JavaScript
Understand why asynchronous JavaScript exists, how Promises work, and how browsers keep interfaces responsive while slow tasks finish.
Start tutorial →fetch() and the Request/Response Cycle
Use fetch() to make real HTTP requests, parse responses correctly, and handle both network and HTTP errors with calmer habits.
Start tutorial →Working with JSON
Parse, inspect, and reshape JSON so raw API responses become clean data structures your UI can actually use.
Start tutorial →async/await Patterns
Rewrite Promise chains with async/await, centralise error handling, and run independent requests in parallel with Promise.all().
Start tutorial →Mini-project: Fetch and Display Live Data
Combine async JavaScript, fetch(), JSON reshaping, and DOM rendering in a small live-data interface that behaves like a real app.
Start tutorial →