Why does it feel wrong? JavaScript isn't that great a language; even if you use CoffeeScript, there are nicer languages out there, and on the server you have the option of using whatever language you want.
Using the same language on client and server can come in handy if you've got some non-trivial amount of code they can share in common. When I made a multi-user text editor (think Etherpad, but simpler), all the code for transforming the editing operations so that everybody's documents converge was written in a single JavaScript file, which I ran on both the client and the server, via node.js. That was great. That was fun. But if you don't have a situation like that, where's the advantage in using JS on the server?
Of course, the comment about it being "wrong" is completely subjective. I just really like JavaScript these days (and I've been paid to program in a lot of other languages - Lisp, C, C++, PostScript, Java, C#...).
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Why does it feel wrong? JavaScript isn't that great a language; even if you use CoffeeScript, there are nicer languages out there, and on the server you have the option of using whatever language you want.
Using the same language on client and server can come in handy if you've got some non-trivial amount of code they can share in common. When I made a multi-user text editor (think Etherpad, but simpler), all the code for transforming the editing operations so that everybody's documents converge was written in a single JavaScript file, which I ran on both the client and the server, via node.js. That was great. That was fun. But if you don't have a situation like that, where's the advantage in using JS on the server?
Of course, the comment about it being "wrong" is completely subjective. I just really like JavaScript these days (and I've been paid to program in a lot of other languages - Lisp, C, C++, PostScript, Java, C#...).