microsoft.graph.chatMessage

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://artifacts.apis.io/microsoft-365/json-schema/microsoft-365-microsoft-graph-chat-message-schema.json",
  "title": "microsoft.graph.chatMessage",
  "x-generated": "2026-11-04",
  "x-method": "derived",
  "x-generator": "derive-json-schema.py",
  "x-source": "openapi/microsoft-365-teams-api-openapi.yml#/components/schemas/microsoft.graph.chatMessage",
  "allOf": [
    {
      "$ref": "#/$defs/microsoft.graph.entity"
    },
    {
      "title": "chatMessage",
      "type": "object",
      "properties": {
        "attachments": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/microsoft.graph.chatMessageAttachment"
          },
          "description": "References to attached objects like files, tabs, meetings etc."
        },
        "body": {
          "$ref": "#/$defs/microsoft.graph.itemBody"
        },
        "channelIdentity": {
          "$ref": "#/$defs/microsoft.graph.channelIdentity"
        },
        "chatId": {
          "type": [
            "string",
            "null"
          ],
          "description": "If the message was sent in a chat, represents the identity of the chat."
        },
        "createdDateTime": {
          "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
          "type": [
            "string",
            "null"
          ],
          "description": "Timestamp of when the chat message was created.",
          "format": "date-time"
        },
        "deletedDateTime": {
          "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
          "type": [
            "string",
            "null"
          ],
          "description": "Read-only. Timestamp at which the chat message was deleted, or null if not deleted.",
          "format": "date-time"
        },
        "etag": {
          "type": [
            "string",
            "null"
          ],
          "description": "Read-only. Version number of the chat message."
        },
        "eventDetail": {
          "$ref": "#/$defs/microsoft.graph.eventMessageDetail"
        },
        "from": {
          "$ref": "#/$defs/microsoft.graph.chatMessageFromIdentitySet"
        },
        "importance": {
          "$ref": "#/$defs/microsoft.graph.chatMessageImportance"
        },
        "lastEditedDateTime": {
          "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
          "type": [
            "string",
            "null"
          ],
          "description": "Read-only. Timestamp when edits to the chat message were made. Triggers an 'Edited' flag in the Teams UI. If no edits are made the value is null.",
          "format": "date-time"
        },
        "lastModifiedDateTime": {
          "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
          "type": [
            "string",
            "null"
          ],
          "description": "Read-only. Timestamp when the chat message is created (initial setting) or modified, including when a reaction is added or removed.",
          "format": "date-time"
        },
        "locale": {
          "type": "string",
          "description": "Locale of the chat message set by the client. Always set to en-us."
        },
        "mentions": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/microsoft.graph.chatMessageMention"
          },
          "description": "List of entities mentioned in the chat message. Supported entities are: user, bot, team, channel, chat, and tag."
        },
        "messageHistory": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/microsoft.graph.chatMessageHistoryItem"
          },
          "description": "List of activity history of a message item, including modification time and actions, such as reactionAdded, reactionRemoved, or reaction changes, on the message."
        },
        "messageType": {
          "$ref": "#/$defs/microsoft.graph.chatMessageType"
        },
        "policyViolation": {
          "$ref": "#/$defs/microsoft.graph.chatMessagePolicyViolation"
        },
        "reactions": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/microsoft.graph.chatMessageReaction"
          },
          "description": "Reactions for this chat message (for example, Like)."
        },
        "replyToId": {
          "type": [
            "string",
            "null"
          ],
          "description": "Read-only. ID of the parent chat message or root chat message of the thread. (Only applies to chat messages in channels, not chats.)"
        },
        "subject": {
          "type": [
            "string",
            "null"
          ],
          "description": "The subject of the chat message, in plaintext."
        },
        "summary": {
          "type": [
            "string",
            "null"
          ],
          "description": "Summary text of the chat message that could be used for push notifications and summary views or fall back views. Only applies to channel chat messages, not chat messages in a chat."
        },
        "webUrl": {
          "type": [
            "string",
            "null"
          ],
          "description": "Read-only. Link to the message in Microsoft Teams."
        },
        "hostedContents": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/microsoft.graph.chatMessageHostedContent"
          },
          "description": "Content in a message hosted by Microsoft Teams - for example, images or code snippets.",
          "x-ms-navigationProperty": true
        },
        "replies": {
          "type": "array",
          "items": {
            "$ref": "#/$defs/microsoft.graph.chatMessage"
          },
          "description": "Replies for a specified message. Supports $expand for channel messages.",
          "x-ms-navigationProperty": true
        }
      },
      "additionalProperties": {
        "type": "object"
      }
    }
  ],
  "$defs": {
    "microsoft.graph.bodyType": {
      "title": "bodyType",
      "enum": [
        "text",
        "html"
      ],
      "type": "string"
    },
    "microsoft.graph.channelIdentity": {
      "title": "channelIdentity",
      "type": "object",
      "properties": {
        "channelId": {
          "type": [
            "string",
            "null"
          ],
          "description": "The identity of the channel in which the message was posted."
        },
        "teamId": {
          "type": [
            "string",
            "null"
          ],
          "description": "The identity of the team in which the message was posted."
        }
      },
      "additionalProperties": {
        "type": "object"
      }
    },
    "microsoft.graph.chatMessage": {
      "allOf": [
        {
          "$ref": "#/$defs/microsoft.graph.entity"
        },
        {
          "title": "chatMessage",
          "type": "object",
          "properties": {
            "attachments": {
              "type": "array",
              "items": {
                "$ref": "#/$defs/microsoft.graph.chatMessageAttachment"
              },
              "description": "References to attached objects like files, tabs, meetings etc."
            },
            "body": {
              "$ref": "#/$defs/microsoft.graph.itemBody"
            },
            "channelIdentity": {
              "$ref": "#/$defs/microsoft.graph.channelIdentity"
            },
            "chatId": {
              "type": [
                "string",
                "null"
              ],
              "description": "If the message was sent in a chat, represents the identity of the chat."
            },
            "createdDateTime": {
              "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
              "type": [
                "string",
                "null"
              ],
              "description": "Timestamp of when the chat message was created.",
              "format": "date-time"
            },
            "deletedDateTime": {
              "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
              "type": [
                "string",
                "null"
              ],
              "description": "Read-only. Timestamp at which the chat message was deleted, or null if not deleted.",
              "format": "date-time"
            },
            "etag": {
              "type": [
                "string",
                "null"
              ],
              "description": "Read-only. Version number of the chat message."
            },
            "eventDetail": {
              "$ref": "#/$defs/microsoft.graph.eventMessageDetail"
            },
            "from": {
              "$ref": "#/$defs/microsoft.graph.chatMessageFromIdentitySet"
            },
            "importance": {
              "$ref": "#/$defs/microsoft.graph.chatMessageImportance"
            },
            "lastEditedDateTime": {
              "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
              "type": [
                "string",
                "null"
              ],
              "description": "Read-only. Timestamp when edits to the chat message were made. Triggers an 'Edited' flag in the Teams UI. If no edits are made the value is null.",
              "format": "date-time"
            },
            "lastModifiedDateTime": {
              "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
              "type": [
                "string",
                "null"
              ],
              "description": "Read-only. Timestamp when the chat message is created (initial setting) or modified, including when a reaction is added or removed.",
              "format": "date-time"
            },
            "locale": {
              "type": "string",
              "description": "Locale of the chat message set by the client. Always set to en-us."
            },
            "mentions": {
              "type": "array",
              "items": {
                "$ref": "#/$defs/microsoft.graph.chatMessageMention"
              },
              "description": "List of entities mentioned in the chat message. Supported entities are: user, bot, team, channel, chat, and tag."
            },
            "messageHistory": {
              "type": "array",
              "items": {
                "$ref": "#/$defs/microsoft.graph.chatMessageHistoryItem"
              },
              "description": "List of activity history of a message item, including modification time and actions, such as reactionAdded, reactionRemoved, or reaction changes, on the message."
            },
            "messageType": {
              "$ref": "#/$defs/microsoft.graph.chatMessageType"
            },
            "policyViolation": {
              "$ref": "#/$defs/microsoft.graph.chatMessagePolicyViolation"
            },
            "reactions": {
              "type": "array",
              "items": {
                "$ref": "#/$defs/microsoft.graph.chatMessageReaction"
              },
              "description": "Reactions for this chat message (for example, Like)."
            },
            "replyToId": {
              "type": [
                "string",
                "null"
              ],
              "description": "Read-only. ID of the parent chat message or root chat message of the thread. (Only applies to chat messages in channels, not chats.)"
            },
            "subject": {
              "type": [
                "string",
                "null"
              ],
              "description": "The subject of the chat message, in plaintext."
            },
            "summary": {
              "type": [
                "string",
                "null"
              ],
              "description": "Summary text of the chat message that could be used for push notifications and summary views or fall back views. Only applies to channel chat messages, not chat messages in a chat."
            },
            "webUrl": {
              "type": [
                "string",
                "null"
              ],
              "description": "Read-only. Link to the message in Microsoft Teams."
            },
            "hostedContents": {
              "type": "array",
              "items": {
                "$ref": "#/$defs/microsoft.graph.chatMessageHostedContent"
              },
              "description": "Content in a message hosted by Microsoft Teams - for example, images or code snippets.",
              "x-ms-navigationProperty": true
            },
            "replies": {
              "type": "array",
              "items": {
                "$ref": "#/$defs/microsoft.graph.chatMessage"
              },
              "description": "Replies for a specified message. Supports $expand for channel messages.",
              "x-ms-navigationProperty": true
            }
          },
          "additionalProperties": {
            "type": "object"
          }
        }
      ]
    },
    "microsoft.graph.chatMessageActions": {
      "title": "chatMessageActions",
      "enum": [
        "reactionAdded",
        "reactionRemoved",
        "actionUndefined",
        "unknownFutureValue"
      ],
      "type": "string",
      "x-ms-enum-flags": {
        "isFlags": true
      }
    },
    "microsoft.graph.chatMessageAttachment": {
      "title": "chatMessageAttachment",
      "type": "object",
      "properties": {
        "content": {
          "type": [
            "string",
            "null"
          ],
          "description": "The content of the attachment. If the attachment is a rich card, set the property to the rich card object. This property and contentUrl are mutually exclusive."
        },
        "contentType": {
          "type": [
            "string",
            "null"
          ],
          "description": "The media type of the content attachment. The possible values are: reference: The attachment is a link to another file. Populate the contentURL with the link to the object.forwardedMessageReference: The attachment is a reference to a forwarded message. Populate the content with the original message context.Any contentType that is supported by the Bot Framework's Attachment object.application/vnd.microsoft.card.codesnippet: A code snippet. application/vnd.microsoft.card.announcement: An announcement header."
        },
        "contentUrl": {
          "type": [
            "string",
            "null"
          ],
          "description": "The URL for the content of the attachment."
        },
        "id": {
          "type": [
            "string",
            "null"
          ],
          "description": "Read-only. The unique ID of the attachment."
        },
        "name": {
          "type": [
            "string",
            "null"
          ],
          "description": "The name of the attachment."
        },
        "teamsAppId": {
          "type": [
            "string",
            "null"
          ],
          "description": "The ID of the Teams app that is associated with the attachment. The property is used to attribute a Teams message card to the specified app."
        },
        "thumbnailUrl": {
          "type": [
            "string",
            "null"
          ],
          "description": "The URL to a thumbnail image that the channel can use if it supports using an alternative, smaller form of content or contentUrl. For example, if you set contentType to application/word and set contentUrl to the location of the Word document, you might include a thumbnail image that represents the document. The channel could display the thumbnail image instead of the document. When the user selects the image, the channel would open the document."
        }
      },
      "additionalProperties": {
        "type": "object"
      }
    },
    "microsoft.graph.chatMessageFromIdentitySet": {
      "allOf": [
        {
          "$ref": "#/$defs/microsoft.graph.identitySet"
        },
        {
          "title": "chatMessageFromIdentitySet",
          "type": "object",
          "additionalProperties": {
            "type": "object"
          }
        }
      ]
    },
    "microsoft.graph.chatMessageHistoryItem": {
      "title": "chatMessageHistoryItem",
      "type": "object",
      "properties": {
        "actions": {
          "$ref": "#/$defs/microsoft.graph.chatMessageActions"
        },
        "modifiedDateTime": {
          "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
          "type": "string",
          "description": "The date and time when the message was modified.",
          "format": "date-time"
        },
        "reaction": {
          "$ref": "#/$defs/microsoft.graph.chatMessageReaction"
        }
      },
      "additionalProperties": {
        "type": "object"
      }
    },
    "microsoft.graph.chatMessageHostedContent": {
      "allOf": [
        {
          "$ref": "#/$defs/microsoft.graph.teamworkHostedContent"
        },
        {
          "title": "chatMessageHostedContent",
          "type": "object",
          "additionalProperties": {
            "type": "object"
          }
        }
      ]
    },
    "microsoft.graph.chatMessageImportance": {
      "title": "chatMessageImportance",
      "enum": [
        "normal",
        "high",
        "urgent",
        "unknownFutureValue"
      ],
      "type": "string"
    },
    "microsoft.graph.chatMessageMention": {
      "title": "chatMessageMention",
      "type": "object",
      "properties": {
        "id": {
          "maximum": 2147483647,
          "minimum": -2147483648,
          "type": [
            "number",
            "null"
          ],
          "description": "Index of an entity being mentioned in the specified chatMessage. Matches the {index} value in the corresponding <at id='{index}'> tag in the message body.",
          "format": "int32"
        },
        "mentioned": {
          "$ref": "#/$defs/microsoft.graph.chatMessageMentionedIdentitySet"
        },
        "mentionText": {
          "type": [
            "string",
            "null"
          ],
          "description": "String used to represent the mention. For example, a user's display name, a team name."
        }
      },
      "additionalProperties": {
        "type": "object"
      }
    },
    "microsoft.graph.chatMessageMentionedIdentitySet": {
      "allOf": [
        {
          "$ref": "#/$defs/microsoft.graph.identitySet"
        },
        {
          "title": "chatMessageMentionedIdentitySet",
          "type": "object",
          "properties": {
            "conversation": {
              "$ref": "#/$defs/microsoft.graph.teamworkConversationIdentity"
            }
          },
          "additionalProperties": {
            "type": "object"
          }
        }
      ]
    },
    "microsoft.graph.chatMessagePolicyViolation": {
      "title": "chatMessagePolicyViolation",
      "type": "object",
      "properties": {
        "dlpAction": {
          "$ref": "#/$defs/microsoft.graph.chatMessagePolicyViolationDlpActionTypes"
        },
        "justificationText": {
          "type": [
            "string",
            "null"
          ],
          "description": "Justification text provided by the sender of the message when overriding a policy violation."
        },
        "policyTip": {
          "$ref": "#/$defs/microsoft.graph.chatMessagePolicyViolationPolicyTip"
        },
        "userAction": {
          "$ref": "#/$defs/microsoft.graph.chatMessagePolicyViolationUserActionTypes"
        },
        "verdictDetails": {
          "$ref": "#/$defs/microsoft.graph.chatMessagePolicyViolationVerdictDetailsTypes"
        }
      },
      "additionalProperties": {
        "type": "object"
      }
    },
    "microsoft.graph.chatMessagePolicyViolationDlpActionTypes": {
      "title": "chatMessagePolicyViolationDlpActionTypes",
      "enum": [
        "none",
        "notifySender",
        "blockAccess",
        "blockAccessExternal"
      ],
      "type": "string",
      "x-ms-enum-flags": {
        "isFlags": true
      }
    },
    "microsoft.graph.chatMessagePolicyViolationPolicyTip": {
      "title": "chatMessagePolicyViolationPolicyTip",
      "type": "object",
      "properties": {
        "complianceUrl": {
          "type": [
            "string",
            "null"
          ],
          "description": "The URL a user can visit to read about the data loss prevention policies for the organization. (ie, policies about what users shouldn't say in chats)"
        },
        "generalText": {
          "type": [
            "string",
            "null"
          ],
          "description": "Explanatory text shown to the sender of the message."
        },
        "matchedConditionDescriptions": {
          "type": "array",
          "items": {
            "type": [
              "string",
              "null"
            ]
          },
          "description": "The list of improper data in the message that was detected by the data loss prevention app. Each DLP app defines its own conditions, examples include 'Credit Card Number' and 'Social Security Number'."
        }
      },
      "additionalProperties": {
        "type": "object"
      }
    },
    "microsoft.graph.chatMessagePolicyViolationUserActionTypes": {
      "title": "chatMessagePolicyViolationUserActionTypes",
      "enum": [
        "none",
        "override",
        "reportFalsePositive"
      ],
      "type": "string",
      "x-ms-enum-flags": {
        "isFlags": true
      }
    },
    "microsoft.graph.chatMessagePolicyViolationVerdictDetailsTypes": {
      "title": "chatMessagePolicyViolationVerdictDetailsTypes",
      "enum": [
        "none",
        "allowFalsePositiveOverride",
        "allowOverrideWithoutJustification",
        "allowOverrideWithJustification"
      ],
      "type": "string",
      "x-ms-enum-flags": {
        "isFlags": true
      }
    },
    "microsoft.graph.chatMessageReaction": {
      "title": "chatMessageReaction",
      "type": "object",
      "properties": {
        "createdDateTime": {
          "pattern": "^[0-9]{4,}-(0[1-9]|1[012])-(0[1-9]|[12][0-9]|3[01])T([01][0-9]|2[0-3]):[0-5][0-9]:[0-5][0-9]([.][0-9]{1,12})?(Z|[+-][0-9][0-9]:[0-9][0-9])$",
          "type": "string",
          "description": "The timestamp type represents date and time information using ISO 8601 format and is always in UTC. For example, midnight UTC on Jan 1, 2014 is 2014-01-01T00:00:00Z.",
          "format": "date-time"
        },
        "displayName": {
          "type": [
            "string",
            "null"
          ],
          "description": "The name of the reaction."
        },
        "reactionContentUrl": {
          "type": [
            "string",
            "null"
          ],
          "description": "The hosted content URL for the custom reaction type."
        },
        "reactionType": {
          "type": "string",
          "description": "The reaction type. Supported values include Unicode characters, custom, and some backward-compatible reaction types, such as like, angry, sad, laugh, heart, and surprised."
        },
        "user": {
          "$ref": "#/$defs/microsoft.graph.chatMessageReactionIdentitySet"
        }
      },
      "additionalProperties": {
        "type": "object"
      }
    },
    "microsoft.graph.chatMessageReactionIdentitySet": {
      "allOf": [
        {
          "$ref": "#/$defs/microsoft.graph.identitySet"
        },
        {
          "title": "chatMessageReactionIdentitySet",
          "type": "object",
          "additionalProperties": {
            "type": "object"
          }
        }
      ]
    },
    "microsoft.graph.chatMessageType": {
      "title": "chatMessageType",
      "enum": [
        "message",
        "chatEvent",
        "typing",
        "unknownFutureValue",
        "systemEventMessage"
      ],
      "type": "string"
    },
    "microsoft.graph.entity": {
      "title": "entity",
      "type": "object",
      "properties": {
        "id": {
          "type": "string",
          "description": "The unique identifier for an entity. Read-only."
        }
      },
      "additionalProperties": {
        "type": "object"
      }
    },
    "microsoft.graph.eventMessageDetail": {
      "title": "eventMessageDetail",
      "type": "object",
      "additionalProperties": {
        "type": "object"
      }
    },
    "microsoft.graph.identity": {
      "title": "identity",
      "type": "object",
      "properties": {
        "displayName": {
          "type": [
            "string",
            "null"
          ],
          "description": "The display name of the identity.For drive items, the display name might not always be available or up to date. For example, if a user changes their display name the API might show the new value in a future response, but the items associated with the user don't show up as changed when using delta."
        },
        "id": {
          "type": [
            "string",
            "null"
          ],
          "description": "Unique identifier for the identity or actor. For example, in the access reviews decisions API, this property might record the id of the principal, that is, the group, user, or application that's subject to review."
        }
      },
      "additionalProperties": {
        "type": "object"
      }
    },
    "microsoft.graph.identitySet": {
      "title": "identitySet",
      "type": "object",
      "properties": {
        "application": {
          "$ref": "#/$defs/microsoft.graph.identity"
        },
        "device": {
          "$ref": "#/$defs/microsoft.graph.identity"
        },
        "user": {
          "$ref": "#/$defs/microsoft.graph.identity"
        }
      },
      "additionalProperties": {
        "type": "object"
      }
    },
    "microsoft.graph.itemBody": {
      "title": "itemBody",
      "type": "object",
      "properties": {
        "content": {
          "type": [
            "string",
            "null"
          ],
          "description": "The content of the item."
        },
        "contentType": {
          "$ref": "#/$defs/microsoft.graph.bodyType"
        }
      },
      "additionalProperties": {
        "type": "object"
      }
    },
    "microsoft.graph.teamworkConversationIdentity": {
      "allOf": [
        {
          "$ref": "#/$defs/microsoft.graph.identity"
        },
        {
          "title": "teamworkConversationIdentity",
          "type": "object",
          "properties": {
            "conversationIdentityType": {
              "$ref": "#/$defs/microsoft.graph.teamworkConversationIdentityType"
            }
          },
          "additionalProperties": {
            "type": "object"
          }
        }
      ]
    },
    "microsoft.graph.teamworkConversationIdentityType": {
      "title": "teamworkConversationIdentityType",
      "enum": [
        "team",
        "channel",
        "chat",
        "unknownFutureValue"
      ],
      "type": "string"
    },
    "microsoft.graph.teamworkHostedContent": {
      "allOf": [
        {
          "$ref": "#/$defs/microsoft.graph.entity"
        },
        {
          "title": "teamworkHostedContent",
          "type": "object",
          "properties": {
            "contentBytes": {
              "type": [
                "string",
                "null"
              ],
              "description": "Write only. Bytes for the hosted content (such as images).",
              "format": "base64url"
            },
            "contentType": {
              "type": [
                "string",
                "null"
              ],
              "description": "Write only. Content type. such as image/png, image/jpg."
            }
          },
          "additionalProperties": {
            "type": "object"
          }
        }
      ]
    }
  }
}