Insert statement not working NodeJs CAPM for POST request

This is my data-model for Book table

CREATE request for Book table

Here I want to auto increment BooksId without passing it in postman, I can see maxId in console but not inserting in table.

BooksId is null,

I want to auto increment BooksId in Book table through JS and dont want to pass through postman, I am beginner in CAPM please correct where I am doing wrong.