Answer Posted / sudhir sheoran

Validation can be done at server side as well as
client side.

Client side validations :-
1) are of great use with the enhancement of
java scripts.
2) Performance booster as validation is done at client side.
3) security issues are there in client side validation.
4) So should be used for simple operations like
user input validations e.g valid name,valid date range,
valid phone number,email etc,where security is of not
that much concern.

Server Side validation(SSV):
1) Some validations can be done at server side only
e.g whether a email exists in database or not.
2) Decreases performance because of more trips to server
3) When security is a concern SSV should be used.

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