Learn JavaScript visually — watch your code actually run
Watch variables change, loops iterate, and function calls stack up — step by step, exactly like the live Visualizer Lab. Your code runs for real in the browser. No lectures. No videos.
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lessons live now
7
modules, beginner to interview-ready
0→JS
beginner to pro
The full JavaScript track is here: 57 lessons covering variables and types through closures, the event loop, the DOM, prototypes and design patterns. Use the Visualizer Lab to run your own JavaScript and watch it execute.