Tradition in Node.js dictates you import core modules using this style:

1 2	var fs = require('fs'); fs.readFile(packageJSONPath, readOperationDidFinish);

I’ve adhered to that style for the most part, but it’s always rubbed me the wrong way.
As a core modules that points to a collection of static methods, capitalization is more appropriate.

1 2	var FS = require('fs'); FS.readFile(packageJSONPath, readOperationDidFinish);

Where the correct decision becomes most apparent is when using the path module:

1 2 3

var Path = require('path'); var join = Path.join; var path = join(process.cwd(), 'package.json');

We used lowercase for local values, and using lowercase for the path module easily results in naming conflicts.