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Fn::Base64

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The intrinsic function `Fn::Base64` returns the Base64 representation of the input string. This function is typically used to pass encoded data to Amazon EC2 instances by way of the `UserData` property.

Declaration

JSON

{ "Fn::Base64" : valueToEncode }

YAML

Syntax for the full function name:

Fn::Base64: valueToEncode

Syntax for the short form:

!Base64 valueToEncode

• Note*

If you use the short form and immediately include another function in the `valueToEncode` parameter, use the full function name for at least one of the functions. For example, the following syntax is invalid:

!Base64 !Sub string
!Base64 !Ref logical_ID

Instead, use the full function name for at least one of the functions, as shown in the following examples:

!Base64
  "Fn::Sub": string

Fn::Base64:
  !Sub string

Parameters

valueToEncode

The string value you want to convert to Base64.

Return value:

The original string, in Base64 representation.

Example

JSON

{ "Fn::Base64" : "AWS CloudFormation" }

YAML

Fn::Base64: AWS CloudFormation

Supported functions

You can use any function that returns a string inside the `Fn::Base64` function.

See also

• Intrinsic Function Reference

Intrinsic Function Reference