How do I use validators in WTForms?

How do I use validators in WTForms?

In WTForms, validators are used to enforce rules on form fields. You can add them by passing them as arguments when defining a field.

Can you give me an example of a validator?

Sure! A common validator is DataRequired, which ensures that a field is not left empty. You can use it like this: name = StringField('Name', validators=[DataRequired()]).

What other validators are available?

WTForms offers many validators like Email, Length, and EqualTo. Each serves a specific purpose for validating user input.

How do I create a custom validator?

To create a custom validator, define a function that raises a ValidationError if the input is invalid, and then use it in your field definition.