Possible Duplicate:
Why is client-side validation not enough ?
you have to validate data before store it.
validate in client side or server side or both?
what's your consideration?
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2possible duplicate of [Why is client-side validation not enough ?](http://stackoverflow.com/questions/3483514/why-client-side-validation-is-not-enough) – Pekka Dec 30 '10 at 12:26
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Given the referenced question, this question is becomes basically, `why not just server-side validation?` – Bert F Dec 30 '10 at 12:39
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My consideration: both.
client-side - more user-friendly (e.g can respond right after leaving the field, no full-page reload, quicker response since no roundtrip network request, etc)
server-side - because you shouldn't trust the client
The drawback is of course maintaining the rules in both places, especially if they are in different languages/frameworks.
