AWS Lambda
Developer Guide


Returns the specified alias information such as the alias ARN, description, and function version it is pointing to. For more information, see Introduction to AWS Lambda Aliases.

This requires permission for the lambda:GetAlias action.

Request Syntax

GET /2015-03-31/functions/FunctionName/aliases/Name HTTP/1.1

URI Request Parameters

The request requires the following URI parameters.


Function name for which the alias is created. An alias is a subresource that exists only in the context of an existing Lambda function so you must specify the function name. Note that the length constraint applies only to the ARN. If you specify only the function name, it is limited to 64 characters in length.

Length Constraints: Minimum length of 1. Maximum length of 140.

Pattern: (arn:aws:lambda:)?([a-z]{2}-[a-z]+-\d{1}:)?(\d{12}:)?(function:)?([a-zA-Z0-9-_]+)(:(\$LATEST|[a-zA-Z0-9-_]+))?


Name of the alias for which you want to retrieve information.

Length Constraints: Minimum length of 1. Maximum length of 128.

Pattern: (?!^[0-9]+$)([a-zA-Z0-9-_]+)

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 200 Content-type: application/json { "AliasArn": "string", "Description": "string", "FunctionVersion": "string", "Name": "string", "RevisionId": "string", "RoutingConfig": { "AdditionalVersionWeights": { "string" : number } } }

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.


Lambda function ARN that is qualified using the alias name as the suffix. For example, if you create an alias called BETA that points to a helloworld function version, the ARN is arn:aws:lambda:aws-regions:acct-id:function:helloworld:BETA.

Type: String

Pattern: arn:aws:lambda:[a-z]{2}-[a-z]+-\d{1}:\d{12}:function:[a-zA-Z0-9-_]+(:(\$LATEST|[a-zA-Z0-9-_]+))?


Alias description.

Type: String

Length Constraints: Minimum length of 0. Maximum length of 256.


Function version to which the alias points.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 1024.

Pattern: (\$LATEST|[0-9]+)


Alias name.

Type: String

Length Constraints: Minimum length of 1. Maximum length of 128.

Pattern: (?!^[0-9]+$)([a-zA-Z0-9-_]+)


Represents the latest updated revision of the function or alias.

Type: String


Specifies an additional function versions the alias points to, allowing you to dictate what percentage of traffic will invoke each version. For more information, see Traffic Shifting Using Aliases.

Type: AliasRoutingConfiguration object



One of the parameters in the request is invalid. For example, if you provided an IAM role for AWS Lambda to assume in the CreateFunction or the UpdateFunctionConfiguration API, that AWS Lambda is unable to assume you will get this exception.

HTTP Status Code: 400


The resource (for example, a Lambda function or access policy statement) specified in the request does not exist.

HTTP Status Code: 404


The AWS Lambda service encountered an internal error.

HTTP Status Code: 500


HTTP Status Code: 429

See Also

For more information about using this API in one of the language-specific AWS SDKs, see the following: