# Adding Inline JS Code
Depending on what you'd like to achieve with the customization, put your custom JS code in the suitable function in the 📄 HTML/js/app.js file:
window.app = {
...
initAJAX: () => {
/**
* The code you put here will be executed
* on page load AND on each AJAX transition
*/
},
initOnce: () => {
/**
* The code you put here will be executed only once
* on page load.
*/
},
...
}