You have to do validation on the server anyway. Why do it again on the front end?
(:
Sorry, those turn up as 'must have' features in like, meeting #2 with the product owner, because the UI feels old and rubbish without them.
Technically? You're 100% right.
...but, I guarantee that even a LOB app, this will turn up, again and again and again as a feature request, until it becomes a tier 1 priority.
Did the user forget to fill a mandatory field? Is this phone number actually even possible? Does this zip/postal code exist? Is the age entered too low to create an account? Is the password long enough? Does it meet all the requirements. Can we dynamically show which requirements it doesn’t meet.
Even email, which you will want to verify by actually sending an email, can have some basic front end checks (is there an @ in the email entered by the user).
In fact, I bet the vast majority of validations can in fact be done in the front end in real time.
For simple projects, the validation built in to HTML form elements may be sufficient.
Yes you do.