My categories

[
  "about",
  "article",
  "categories",
  "index",
  "note",
  "posts",
  "tags"
]

try these links:
http://localhost:8080/categories/?q=ololo
http://localhost:8080/categories/?q=ololo&q=trololo

and see results:

?q=...

{}

!!query.q && query.q && Array.isArray(query.q): false

дебаг компонента

---

$page

{
  "title": "Категории",
  "frontmatter": {
    "layout": "MyFooteredLayout",
    "lang": "ru-RU",
    "home": true,
    "title": "Категории",
    "description": "Список категорий",
    "date": "2021-02-11 16:05:07 GMT+0200",
    "categories": [
      "categories"
    ]
  },
  "regularPath": "/categories/",
  "relativePath": "categories/README.md",
  "key": "v-1a792f68",
  "path": "/categories/"
}

---

$frontmatter

{
  "layout": "MyFooteredLayout",
  "lang": "ru-RU",
  "home": true,
  "title": "Категории",
  "description": "Список категорий",
  "date": "2021-02-11 16:05:07 GMT+0200",
  "categories": [
    "categories"
  ]
}

---

$lang

ru-RU

---

$localePath

/

---

$title

Мой блог

---

$description

Список категорий

---

$themeConfig

{
  "prefersTheme": "dark",
  "smoothScroll": true,
  "serviceWorker": {
    "updatePopup": true
  },
  "nav": [
    {
      "text": "Блог",
      "link": "/",
      "type": "link",
      "items": []
    },
    {
      "text": "Обо мне",
      "link": "/about/",
      "type": "link",
      "items": []
    },
    {
      "text": "Категории",
      "link": "/categories/",
      "type": "link",
      "items": []
    },
    {
      "text": "Теги",
      "link": "/tags/",
      "type": "link",
      "items": []
    }
  ]
}