The CMDB Meta API provides endpoints to obtain meta data on a Configuration Management Database (CMDB) class.

This API requires that the user have the ITIL role.

CMDB Meta - GET /now/cmdb/meta/{classname}

Returns the meta data for the specified CMDB class.

URL format

Versioned URL: /api/now/{api_version}/cmdb/meta/{className}

Default URL: /api/now/cmdb/meta/{className}

Note: Available versions are specified in the REST API Explorer. For scripted REST APIs there is additional version information on the Scripted REST Service form.

Supported request parameters

Table 1. Path parameters
Name Description
api_version Optional. Version of the endpoint to access. For example, v1 or v2. Only specify this value to use an endpoint version other than the latest.

Data type: String
className CMDB class name. This is the name of the table that contains the desired CI records, such as cmdb_ci_linux_server or cmdb_ci_apache_web_server.

Data type: String
Table 2. Query parameters
Name Description
None
Table 3. Request body parameters (XML or JSON)
Name Description
None

Headers

The following request and response headers apply to this HTTP action only, or apply to this action in a distinct way. For a list of general headers used in the REST API, see Supported REST API headers.

Table 4. Request headers
Header Description
Accept Data format of the response body. Supported types: application/json or application/xml.

Default: application/json
Table 5. Response headers
Header Description
None

Status codes

The following status codes apply to this HTTP action. For a list of possible status codes used in the REST API, see REST API HTTP response codes.

Response body parameters (JSON or XML)

Example: Sample cURL request

curl "https://instance.servicenow/api/now/cmdb/meta/cmdb_ci_computer" \
--request GET \
--header "Accept:application/json" \
--user 'username':'password'

{
  "result": {
    "icon_url": "images/app.ngbsm/computer.svg",
    "is_extendable": true,
    "parent": "cmdb_ci_hardware",
    "children": [
      "cmdb_ci_ucs_blade",
      "cmdb_ci_pc_hardware",
      "cmdb_ci_ucs_rack_unit",
      "cmdb_ci_mainframe_hardware",
      "cmdb_ci_server",
      "cmdb_ci_storage_switch"
    ],
    "name": "cmdb_ci_computer",
    "icon": "c6442dd69fb00200eb3919eb552e7012",
    "attributes": [
      {
        "is_inherited": "false",
        "is_mandatory": "false",
        "is_read_only": "false",
        "default_value": null,
        "label": "OS Address Width (bits)",
        "type": "integer",
        "element": "os_address_width",
        "max_length": "40",
        "is_display": "false"
      },
      {
        "is_inherited": "true",
        "is_mandatory": "false",
        "is_read_only": "true",
        "default_value": "false",
        "label": "Skip sync",
        "type": "boolean",
        "element": "skip_sync",
        "max_length": "40",
        "is_display": "false"
      },
      {
        "is_inherited": "true",
        "is_mandatory": "false",
        "is_read_only": "false",
        "default_value": null,
        "label": "DNS Domain",
        "type": "string",
        "element": "dns_domain",
        "max_length": "255",
        "is_display": "false"
      },
      {
        "is_inherited": "true",
        "is_mandatory": "false",
        "is_read_only": "false",
        "default_value": null,
        "label": "Purchased",
        "type": "glide_date",
        "element": "purchase_date",
        "max_length": "40",
        "is_display": "false"
      },
      {
        "is_inherited": "true",
        "is_mandatory": "false",
        "is_read_only": "false",
        "default_value": null,
        "label": "Lease contract",
        "type": "string",
        "element": "lease_id",
        "max_length": "40",
        "is_display": "false"
      }
    ],
    "relationship_rules": [
      {
        "parent": "cmdb_ci_computer",
        "relation_type": "cb5592603751200032ff8c00dfbe5d17",
        "child": "dscy_route_next_hop"
      },
      {
        "parent": "cmdb_ci_computer",
        "relation_type": "cb5592603751200032ff8c00dfbe5d17",
        "child": "dscy_router_interface"
      },
      {
        "parent": "cmdb_ci_computer",
        "relation_type": "cb5592603751200032ff8c00dfbe5d17",
        "child": "dscy_route_interface"
      },
      {
        "parent": "cmdb_ci_computer",
        "relation_type": "55c95bf6c0a8010e0118ec7056ebc54d",
        "child": "cmdb_ci_storage_pool"
      },
      {
        "parent": "cmdb_ci_computer",
        "relation_type": "55c95bf6c0a8010e0118ec7056ebc54d",
        "child": "cmdb_ci_disk_partition"
      },
      {
        "parent": "cmdb_ci_computer",
        "relation_type": "55c95bf6c0a8010e0118ec7056ebc54d",
        "child": "cmdb_ci_storage_volume"
      },
      {
        "parent": "cmdb_ci_computer",
        "relation_type": "55c95bf6c0a8010e0118ec7056ebc54d",
        "child": "cmdb_ci_storage_device"
      }
    ],
    "label": "Computer",
    "identification_rules": {
      "related_rules": [
        {
          "condition": "",
          "exact_count_match": false,
          "referenced_field": "installed_on",
          "active": true,
          "attributes": "name",
          "allow_fallback": false,
          "table": "cmdb_print_queue_instance",
          "order": 100,
          "allow_null_attribute": false
        }
      ],
      "applies_to": "cmdb_ci_hardware",
      "identifiers": [
        {
          "condition": "valid=true^absent=false^EQ",
          "exact_count_match": true,
          "referenced_field": "cmdb_ci",
          "active": true,
          "attributes": "serial_number,serial_number_type",
          "allow_fallback": false,
          "table": "cmdb_serial_number",
          "order": 100,
          "allow_null_attribute": false
        },
        {
          "condition": null,
          "exact_count_match": false,
          "referenced_field": null,
          "active": true,
          "attributes": "serial_number",
          "allow_fallback": false,
          "table": null,
          "order": 200,
          "allow_null_attribute": false
        },
        {
          "condition": null,
          "exact_count_match": false,
          "referenced_field": null,
          "active": true,
          "attributes": "name",
          "allow_fallback": false,
          "table": null,
          "order": 300,
          "allow_null_attribute": false
        },
        {
          "condition": "install_status!=100^EQ",
          "exact_count_match": true,
          "referenced_field": "cmdb_ci",
          "active": true,
          "attributes": "ip_address,mac_address",
          "allow_fallback": false,
          "table": "cmdb_ci_network_adapter",
          "order": 400,
          "allow_null_attribute": false
        }
      ],
      "name": "Hardware Rule",
      "description": "Identifier for hardware.",
      "active": true,
      "is_independent": true
    }
  }
}