Ansible inventory to dynamic inventory JSON output, accepts all inventory input formats

inventory2json.py

import sys
import json

from ansible.parsing.dataloader import DataLoader

try:
    from ansible.inventory.manager import InventoryManager
    A24 = True
except ImportError:
    from ansible.vars import VariableManager
    from ansible.inventory import Inventory
    A24 = False

loader = DataLoader()
if A24:
    inventory = InventoryManager(loader, [sys.argv[1]])
    inventory.parse_sources()
else:
    variable_manager = VariableManager()
    inventory = Inventory(loader, variable_manager, sys.argv[1])
    inventory.parse_inventory(inventory.host_list)

out = {'_meta': {'hostvars': {}}}
for group in inventory.groups.values():
    out[group.name] = {
        'hosts': [h.name for h in group.hosts],
        'vars': group.vars,
        'children': [c.name for c in group.child_groups]
    }
for host in inventory.get_hosts():
    out['_meta']['hostvars'][host.name] = host.vars

print(json.dumps(out, indent=4, sort_keys=True))

output.txt

$ python inventory2json.py ansible/test/integration/inventory
{
    "_meta": {
        "hostvars": {
            "facthost0": {
                "ansible_connection": "local",
                "ansible_host": "1270.0.0.1"
            },
            "facthost1": {
                "ansible_connection": "local",
                "ansible_host": "1270.0.0.1"
            },
            "facthost2": {
                "ansible_connection": "local",
                "ansible_host": "1270.0.0.1"
            },
            "facthost3": {
                "ansible_connection": "local",
                "ansible_host": "1270.0.0.1"
            },
            "facthost4": {
                "ansible_connection": "local",
                "ansible_host": "1270.0.0.1"
            },
            "facthost5": {
                "ansible_connection": "local",
                "ansible_host": "1270.0.0.1"
            },
            "facthost6": {
                "ansible_connection": "local",
                "ansible_host": "1270.0.0.1"
            },
            "facthost7": {
                "ansible_connection": "local",
                "ansible_host": "1270.0.0.1"
            },
            "facthost8": {
                "ansible_connection": "local",
                "ansible_host": "1270.0.0.1"
            },
            "invenoverride": {
                "ansible_connection": "local",
                "ansible_ssh_host": "127.0.0.1"
            },
            "localhost": {
                "ansible_connection": "local",
                "ansible_ssh_host": "127.0.0.1"
            },
            "testhost": {
                "a": 1,
                "ansible_connection": "local",
                "ansible_ssh_host": "127.0.0.1",
                "b": 2,
                "c": 3,
                "d": 4,
                "defaults_file_var_role3": "overridden from inventory",
                "role_var_beats_inventory": "should_not_see_this",
                "test_hash": {
                    "host_vars_testhost": "this is in host_vars/testhost"
                }
            },
            "testhost2": {
                "ansible_connection": "local",
                "ansible_ssh_host": "127.0.0.1"
            },
            "testhost3": {
                "ansible_ssh_host": "127.0.0.3"
            },
            "testhost4": {
                "ansible_ssh_host": "127.0.0.4"
            }
        }
    },
    "all": {
        "children": [
            "ungrouped",
            "inven_overridehosts",
            "arbitrary_grandparent",
            "amazon"
        ],
        "hosts": [],
        "vars": {
            "a": 999,
            "b": 998,
            "c": 997,
            "d": 996,
            "dos": 2,
            "etest": "from group_vars",
            "extra_var_override": "FROM_INVENTORY",
            "inven_var": "inventory_var",
            "inventory_beats_default": "narf",
            "test_bare": true,
            "test_bare_nested_bad": "{{test_bare_var}} == 321",
            "test_bare_nested_good": "{{test_bare_var}} == 123",
            "test_bare_var": 123,
            "test_hash": {
                "group_vars_all": "this is in group_vars/all"
            },
            "tres": 3,
            "unicode_host_var": "Caf\u00e9E\u00f1yei",
            "uno": 1
        }
    },
    "amazon": {
        "children": [],
        "hosts": [
            "localhost"
        ],
        "vars": {
            "ec2_region": "us-east-1",
            "ec2_url": "ec2.amazonaws.com"
        }
    },
    "arbitrary_grandparent": {
        "children": [
            "arbitrary_parent"
        ],
        "hosts": [],
        "vars": {
            "grandparent_var": 2000,
            "groups_tree_var": 3000,
            "overridden_in_parent": 2000
        }
    },
    "arbitrary_parent": {
        "children": [
            "local"
        ],
        "hosts": [],
        "vars": {
            "groups_tree_var": 4000,
            "overridden_in_parent": 1000
        }
    },
    "inven_overridehosts": {
        "children": [],
        "hosts": [
            "invenoverride"
        ],
        "vars": {
            "foo": "foo",
            "var_dir": "vars"
        }
    },
    "local": {
        "children": [],
        "hosts": [
            "testhost",
            "testhost2",
            "testhost3",
            "testhost4",
            "facthost0",
            "facthost1",
            "facthost2",
            "facthost3",
            "facthost4",
            "facthost5",
            "facthost6",
            "facthost7",
            "facthost8"
        ],
        "vars": {
            "groups_tree_var": 5000,
            "hash_test": {
                "group_vars_local": "this is in group_vars/local"
            },
            "parent_var": 6000,
            "tres": "three"
        }
    },
    "ungrouped": {
        "children": [],
        "hosts": [],
        "vars": {}
    }
}