Web Reference: Feb 12, 2026 · In this lesson, we will return to the subject of debugging JavaScript (which we first looked at in What went wrong?). Here we will delve deeper into techniques for tracking down errors and explain how to code defensively and handle errors in your code, avoiding problems in the first place. If your code "does nothing", the console often tells you why. Normally (otherwise follow the steps at the bottom of this page), you activate debugging in your browser with the F12 key, and select Console in the debugger menu. If you do only one thing: always check the console when something fails. Jul 11, 2025 · Syntax errors occur when code violates JavaScript's syntax rules. These errors are typically caught during compilation.
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