Node.jsintermediateabout 40 minutes

Node.js: modules and async work

Exports and imports, promises, async/await and error handling, with the JavaScript parts running live.

By the end you can

Easier if you did first

0 of 3 done

step 1 of 3

Modules and what runs where

Node runs JavaScript outside the browser: on a server, where it can read files, open sockets and hold secrets.

The language is the same; what differs is what is available. There is no document in Node, and no file system in a browser.

The JavaScript in the next step runs in your browser, so Node-only APIs are described here rather than executed.

question 1 of 3
Which pair is the modern (ES module) way to share code?
question 2 of 3
Why must an API key live on the server rather than in front-end code?

question 3 of 3

What does this print, and why?

console.log("one");
setTimeout(() => console.log("two"), 0);
Promise.resolve().then(() => console.log("three"));
console.log("four");