you have it ready on html as attribute of the input

but in order to takes place you will have to change the code a little bit and make all the logic inside a tags and submit the form using a button and then e.preventDefault() like the other answer told

for more information check this

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/input#Attributes

you can just use this attribute to required that input cannot to be empty

 <input type="text" required >

"required" like this ^^^

for minlength just use "minlength" attribute

<input type="text" required minlength="5">

like this ^^^

input type email will check if you input an email ish string

<input type="email" >

like this ^^^

will take any string that has [email protected]

hopes that helps !!!

but if you need more validation then that you will have to create your own :(

maybe this video will able to help you out

https://www.youtube.com/watch?v=In0nB0ABaUk