Experss validator and ejs how to use it?

[Jose Perez]

Can someone explain to me how to use express validator middleware v5.x and ejs,

for example I need to validate that the minimal length of username not less than 5 

and then show up any error message produced by the validator on EJS layout.

I know Express validator has a .islenght validation but how to implement this

on my route and then show up the message any message produced by the validator on my EJS layout.

I need just a brief example.