Ansible Inventory File JSON Format

hosts.json

{
    "centos": {
        "hosts": {
            "centos1": {
                "ansible_port": 2222
            },
            "centos2": null,
            "centos3": null
        },
        "vars": {
            "ansible_user": "root"
        }
    },
    "ubuntu": {
        "hosts": {
            "ubuntu1": null,
            "ubuntu2": null,
            "ubuntu3": null
        },
        "vars": {
            "ansible_become": true,
            "ansible_become_pass": "password"
        }
    },
    "linux": {
        "children": {
            "centos": null,
            "ubuntu": null
        }
    }
}