{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://developers.asana.com/schemas/webhook-event",
  "title": "Asana Webhook Event",
  "description": "An event object representing a change to a resource, delivered asynchronously to the target location of an active webhook subscription.",
  "type": "object",
  "properties": {
    "user": {
      "oneOf": [
        { "$ref": "#/$defs/UserCompact" },
        { "type": "null" }
      ],
      "description": "The user who triggered the event. May be null for system-generated events."
    },
    "resource": {
      "$ref": "#/$defs/AsanaNamedResource",
      "description": "The resource that triggered the event by being modified."
    },
    "type": {
      "type": "string",
      "description": "Deprecated. The type of the resource that generated the event.",
      "examples": ["task"]
    },
    "action": {
      "type": "string",
      "enum": ["changed", "added", "removed", "deleted", "undeleted"],
      "description": "The type of action taken on the resource.",
      "examples": ["changed"]
    },
    "parent": {
      "oneOf": [
        { "$ref": "#/$defs/AsanaNamedResource" },
        { "type": "null" }
      ],
      "description": "For added/removed events, the parent object. Null for other event types."
    },
    "created_at": {
      "type": "string",
      "format": "date-time",
      "description": "The timestamp when the event occurred.",
      "examples": ["2024-01-15T10:30:00.000Z"]
    },
    "change": {
      "type": ["object", "null"],
      "description": "Information about the field-level change. Only present when action is 'changed'.",
      "properties": {
        "field": {
          "type": "string",
          "description": "The name of the field that has changed.",
          "examples": ["assignee"]
        },
        "action": {
          "type": "string",
          "enum": ["changed", "added", "removed"],
          "description": "The type of action taken on the field.",
          "examples": ["changed"]
        },
        "new_value": {
          "type": ["object", "null"],
          "description": "The new value when change.action is 'changed' and value is an Asana resource.",
          "properties": {
            "gid": { "type": "string" },
            "resource_type": { "type": "string" }
          }
        },
        "added_value": {
          "type": ["object", "null"],
          "description": "The added value when change.action is 'added' and value is an Asana resource.",
          "properties": {
            "gid": { "type": "string" },
            "resource_type": { "type": "string" }
          }
        },
        "removed_value": {
          "type": ["object", "null"],
          "description": "The removed value when change.action is 'removed' and value is an Asana resource.",
          "properties": {
            "gid": { "type": "string" },
            "resource_type": { "type": "string" }
          }
        }
      }
    }
  },
  "required": ["resource", "action", "created_at"],
  "$defs": {
    "UserCompact": {
      "type": "object",
      "properties": {
        "gid": { "type": "string" },
        "resource_type": { "type": "string", "const": "user" },
        "name": { "type": "string" }
      }
    },
    "AsanaNamedResource": {
      "type": "object",
      "properties": {
        "gid": { "type": "string" },
        "resource_type": { "type": "string" },
        "name": { "type": "string" }
      }
    }
  }
}