How to set input field value in server side?

Question

I am making a search engine with the help of next.js. I want to put a value in the input field. I want to do this in work before it is rendered in client side. I want to do this in work before it is rendered in client side. Because here rendering in server side will already be generated.

How can I do this?

I am able to change the value of input field in client side.

But how to do it in server side?

i am new in next.js so I don't know about server side rendering.