Token from .env is undefined when fetching data NUXT 3

I'm trying to fetch data from api, as always i need to secure my token that backend given. Using useRuntimeConfig that documentation of Nuxt given. But This always getting undefined value of token.

<script setup lang="ts">
  interface User {
    nama: string;
  }

  const pending = ref(true)
  const data = ref < User > ()

  onMounted(async() => {
    const response = await fetch('/api/users', {
      headers: {
        'Content-Type': 'application/json',
        'Authorization': `Basic ${useRuntimeConfig().TOKEN}`,
      },
    })
    const users = await response.json()
    data.value = users
    pending.value = false
  })
</script>

Get solution that can store data from .env