karabiner.json

{
    "global": {
        "show_in_menu_bar": false
    },
    "profiles": [
        {
            "complex_modifications": {
                "parameters": {
                    "basic.to_if_held_down_threshold_milliseconds": 100
                },
                "rules": [
                    {
                        "description": "Caps is escape when tapped and control when held",
                        "manipulators": [
                            {
                                "from": {
                                    "key_code": "caps_lock",
                                    "modifiers": {
                                        "optional": [
                                            "any"
                                        ]
                                    }
                                },
                                "to": [
                                    {
                                        "key_code": "left_control"
                                    }
                                ],
                                "to_if_alone": [
                                    {
                                        "key_code": "escape"
                                    }
                                ],
                                "type": "basic"
                            }
                        ]
                    }
                ]
            },
            "devices": [
                {
                    "identifiers": {
                        "is_keyboard": true,
                        "product_id": 1031,
                        "vendor_id": 1241
                    },
                    "simple_modifications": [
                        {
                            "from": {
                                "key_code": "left_command"
                            },
                            "to": [
                                {
                                    "key_code": "left_option"
                                }
                            ]
                        },
                        {
                            "from": {
                                "key_code": "left_option"
                            },
                            "to": [
                                {
                                    "key_code": "left_command"
                                }
                            ]
                        }
                    ]
                }
            ],
            "name": "Default profile",
            "selected": true,
            "virtual_hid_keyboard": {
                "country_code": 0,
                "keyboard_type_v2": "ansi"
            }
        }
    ]
}