How to display values from array in JS?

I want to display all values from array categories, but I always got [object object] or undefined.
Here is code in last lines if statement, there is that problem in part between bracket [] when I want to call categories and type of categories is Object:

  const urlKeys = [...new URL(window.location.href).searchParams.keys()];

  let categories = [];

  let count = urlKeys.length;

  for (let i = 0; i < count - 1; i++) {
    categories.push({ type: paramsFromUrl.get('category' + i) })
  }  //Here I push elements in categories

  if (urlKeys[0] === 'allCategories') {
    document.getElementById('notice').innerText = "All categories included: [" + categories + "]";
    return viewsjs.createRestaurantCards(filterjs.findRestaurantsByCategory(await restaurantsjs.loadRestaurantsJSON(), categories));
  } //Here is problem

>Solution :

categories is an array of objects. If you want to convert that to a string, you need to do JSON.stringify

"All categories included: " + JSON.stringify(categories);

If you only want to display the type and not the whole object, then:

"All categories included: [" + categories.map(obj => obj.type) + "]";