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Lesson 15 of 20

Async JavaScript & Fetch

Request external data using promises and async/await.

Introduction

Network requests take time, so JavaScript uses asynchronous patterns to avoid blocking the interface.

The fetch API returns a promise and is commonly combined with async/await for readable control flow.

Key insight

Request external data using promises and async/await.

Example

async function loadData() {
  const response = await fetch("/api/example");
  const data = await response.json();
  console.log(data);
}

This example shows the core async javascript & fetch idea in a small, runnable program.

Real-world example

Async JavaScript & Fetch appears in everyday application code, scripts and APIs.

Test yourself

2-question check

1

What is the main idea in Async JavaScript & Fetch?

2

Where can async javascript & fetch be useful?

Ready to check your understanding?

Answer every question, then submit your quiz.

Try it yourself

JavaScript compiler

Runs in your browser. Nothing is sent to a server.

Output appears here

Practice challenge

Describe how you would handle a failed fetch request with try/catch.

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