Karabiner Elements - Map Caps Lock to Left Control

capsctrl.json

{
  "title": "Map Caps Lock to Left Control",
  "rules": [
    {
      "description": "Change caps_lock to left_control",
      "manipulators": [
        {
          "type": "basic",
          "from": {
            "key_code": "caps_lock"
          },
          "to": [
            {
              "key_code": "left_control"
            }
          ]
        }
      ]
    }
  ]
}