# Criteria for deleting contact information

The `criteria` object specifies which contacts or contact groups to delete and from which database. If no database is specified, the information is deleted from the default database.

The `criteria` object has two main properties: `Type` and `Data`. These are described in the following table. Properties enclosed in brackets are optional.

Note: All string values in the object are Unicode.

Table: Criteria object properties
Property | Description | Type | Value
--- | --- | --- | ---
`criteria.Type` | Specifies the type of contact information to delete. | string | Possible values: `"Contact"` `"Group"`
`criteria.Data` | Specifies the contact information to delete. | object | Object with the properties specified below
`[criteria.Data.DBUri]` | Specifies the contacts database from which the information is deleted. If this property is not specified, the default database is used. | string |
`criteria.Data.IdList` | Specifies the unique identifiers of the contacts or contact groups to delete. `Data.IdList[0]` contains the ID of the first entry. | array of strings |