varchar with n and varchar without n difference in postgresql

Question

Is there any difference between varchar and varchar(n) regarding any performance and disk usage in postgresql? (Except length constraint and constraint performance). For example, does varchar(wihtout n) consume more space?

Answer 1

varchar, varchar(n) and text are all the same under the hood; the only exception is the lenght check in varchar(n), which acts like a (fast) check constraint.