In Flutter, How can I change TextFormField validation error message style?

Question

I want to set a bigger font size for error message validation in TextFormField but I don't know how.

user_7130820 · Answer

For this you have to use InputDecoration

TextFormField(
  decoration: InputDecoration(
    errorStyle: TextStyle(
      fontSize: 16.0,
    ),
  ),
  ...
)