Sitelet endpoints can deserialize forms submitted via POST automatically, please refer to the "Customizing Sitelet.Infer" section on the sitelet documentation page for more info.
As to the second part of your question, I would suggest using client-side validation (including pre-POST actions to verify what can be verified on the server only) before posting your form data and display validation feedback in-form.
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N.b. I found this post from long ago but I'm not sure it answers my question https://forums.websharper.com/topic/59876
Does WebSharper provide a mechanism for building/rendering forms that use standard browser form POST submissions rather than posting in the background via AJAX?
Obviously I can render the form using formlets and just make sure they're in a regular form tag with the right action attribute, but as far as I can tell I'm on my own from that point in terms of deserializing the form post to an object on the server, and re-rendering the form if there are any validation errors (which also means I need to repopulate the fields with whatever the user typed into them).
I can't find any examples where the form isn't posted via AJAX, so I'm guessing this is the only option, unless I'm missing something?
Many thanks,
James