Indentation Levels for JavaScript

What’s the recommended indentation level for JavaScript code?

There’s no universal agreement, but my recommendation is four spaces per indentation level.

Here are the indentation rules from notable JavaScript style guides:

• Crockford’s Code Conventions for JavaScript recommends 4 spaces for indents.
• The Dojo Style Guide recommends tabs (set to 4 spaces) for indents.
• The Google JavaScript Style Guide recommends two spaces for indents.
• The jQuery Style Guide recommends indentation with tabs.

Whichever style you adopt, be sure not to mix them.

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