Could not find this answer anywhere, but I did find several mailing lists where this was discussed, these are rather old however and I have no idea if this is implemented or not.
Is there anyway to force using strict mode in node.js?
Writing "use strict"; in all my .js files... well, i prefer it being forced to using strict mode, rather than adding extra boilerplate.
According to Lloyd you can now place
"use strict";
at the top of your file in node >= 0.10.7, but if you want your whole app to run in strict (including external modules) you can do this
node --use_strict
In node 0.10.7 you can enforce strict mode at file level by placing "use strict"; at the top of your file. Finally!