const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('{protocol}://{host}/api/v2/config', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

{
  "fields": [
    {
      "path": "general/identity/site_name",
      "kind": "string",
      "label": "config.field.general.identity.site_name.label",
      "allowed_scopes": [
        "global",
        "organization",
        "tenant"
      ]
    },
    {
      "path": "general/locale/default_timezone",
      "kind": "enum",
      "label": "config.field.general.locale.default_timezone.label",
      "allowed_scopes": [
        "global",
        "organization",
        "tenant"
      ]
    }
  ]
}