Learn it
JavaScript runs in every web browser. Open the console (F12 or right-click → Inspect → Console) to try code, or use CodePen/JSFiddle. console.log() prints messages.
🧰 Tool: a free online editor such as CodePen or JSFiddle, or a plain text editor and your web browser.
Code examples
JavaScript
console.log("Hello, world!");
console.log(6 * 7);
let name = "Riley";
console.log("Hi " + name);
console.log(`Template strings: ${name} has ${name.length} letters`);Backticks make template strings with ${…}.
Project: Console explorer
- Open the browser console.
- Run each line.
- Use console.log to print your name, age next year, and a fun fact.
Challenge: Try alert(“Hi!”) — it shows a popup.