How to Hide keyboard in the app completely

How to hide keyboard in the app completely? I am developing an app where I need only buttons for input which I have created but now I need to hide keyboard from the app.

You can use the Keyboard plugin and easily hide the keyboard:

import { Keyboard } from '@ionic-native/keyboard/ngx';

constructor(private keyboard: Keyboard) { }

...

this.keyboard.hide();

Keyboard shows up when an input is focused. I need to completely remove keyboard from the app.

I believe you can use what I already mentioned with some TypeScript logic, like:
when the input is focused hide the keyboard.

Here is another way to solve this, with another plugin.