karabiner_elements_swap_internal_fn_ctrl.json

{
  "title": "Swap fn and left ctrl on internal keyboard",
  "rules": [
    {
      "description": "Change fn to left ctrl",
      "manipulators": [
        {
          "conditions": [
            {
              "type": "device_if",
              "identifiers": [
                {"vendor_id": 1452, "product_id": 627},
                {"vendor_id": 1452, "product_id": 657}
              ]
            }
          ],
          "type": "basic",
          "from": {"key_code": "fn"},
          "to": [{"key_code": "left_control"}]
        }
      ]
    },
    {
      "description": "Change left ctrl to fn",
      "manipulators": [
        {
          "conditions": [
            {
              "type": "device_if",
              "identifiers": [
                {"vendor_id": 1452, "product_id": 627},
                {"vendor_id": 1452, "product_id": 657}
              ]
            }
          ],
          "type": "basic",
          "from": {"key_code": "left_control"},
          "to": [{"key_code": "fn"}]
        }
      ]
    }
  ]
}