Coding Style Guide for node.js apps?

There's a new standard in town.

Use Standard Style.

I'd review the coding standards checked by JSLint or look at the author of NPM (Isaac Shlueter's) coding standards.

You could also look at the style used by notable Node.JS coders:

• TJ Holowaychuk
• Isaac Shlueter
• Tim Caswell
• Jeremy Ashkenas
• Felix Geisendörfer
• Charlie Robbins
• Marak Squires
• Aaron Heckmann
• Guillermo Rauch
• Mikeal Rogers
• Ryan Dahl + you could look at the actual Node.JS codebase

I'll throw mine in there for good measure ;)

Edit: Suggestions from @alienhard

• Google JavaScript style Guide
• Felix's Node.js Style Guide

IMO there's a few golden rules you should follow:

• Never use with or eval
• Use === over ==
• Always declare your variables with var in the appropriate scope - don't fallback to the global scope
• Wrap your app in a closure (function(){})() if you plan on releasing code that runs server-side as well as in the browser
• Callbacks should take err as the first argument and if they themselves take a callback as an argument, it should be last, e.g. callback(err, param1, param2, callback)

Indentation, spacing between braces and keywords and semicolon placement are all a matter of preference.