Writing JavaScript in Web Browsers

Master all 20 places to run JavaScript code

1

Address Bar

Execute JavaScript directly in the browser address bar

How to use:

Type in address bar and press Enter

Click to view example code →
2

Bookmarklets

Save JavaScript code as bookmarks for one-click execution

How to use:

Save as bookmark, click to execute

Click to view example code →
3

DevTools Console

Interactive REPL for real-time JavaScript execution

How to use:

F12 → Console tab → Type code → Enter

Click to view example code →
4

DevTools Snippets

Save and run reusable code snippets in DevTools

How to use:

F12 → Sources → Snippets → New snippet → Ctrl+Enter

Click to view example code →