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    Resource Orchestration Service:Fn::Contains

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    Resource Orchestration Service:Fn::Contains

    Last Updated:Jun 17, 2026

    Fn::Contains returns true if a specified value matches at least one member in a list, and false otherwise.

    Declaration

    • JSON

      {
  "Fn::Contains": [
    [
      value_1,
      value_2,
      ...
    ],
    value
  ]
}

    • YAML

      • Syntax for the full function name: 

        Fn::Contains:
  - - value_1
    - value_2
    - ...
  - value

      • Syntax for the short form: 

        !Contains [[value_1, value_2, ...], value]

    Parameters

    • value_1, value_2, ...: Required. A list of members.

    • value: Required. The value to compare against the members in the list.

    Return value

    true or false.

    Examples

    • !Contains
  - - 1
    - 2
    - 3
  - 3

      In this example, true is returned. 

    • Fn::Contains:
  - - 1
    - 2
    - 3
  - 4

      In this example, false is returned.