AWS Lambda
Developer Guide

GetFunction

Returns the configuration information of the Lambda function and a presigned URL link to the .zip file you uploaded with CreateFunction so you can download the .zip file. Note that the URL is valid for up to 10 minutes. The configuration information is the same information you provided as parameters when uploading the function.

Use the Qualifier parameter to retrieve a published version of the function. Otherwise, returns the unpublished version ($LATEST). For more information, see AWS Lambda Function Versioning and Aliases.

This operation requires permission for the lambda:GetFunction action.

Request Syntax

GET /2015-03-31/functions/FunctionName?Qualifier=Qualifier HTTP/1.1

URI Request Parameters

The request requires the following URI parameters.

FunctionName

The name of the Lambda function.

Name formats

  • Function name - MyFunction.

  • Function ARN - arn:aws:lambda:us-west-2:123456789012:function:MyFunction.

  • Partial ARN - 123456789012:function:MyFunction.

The length constraint applies only to the full 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 170.

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

Qualifier

Specify a version or alias to get details about a published version of the function.

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

Pattern: (|[a-zA-Z0-9$_-]+)

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 200 Content-type: application/json { "Code": { "Location": "string", "RepositoryType": "string" }, "Concurrency": { "ReservedConcurrentExecutions": number }, "Configuration": { "CodeSha256": "string", "CodeSize": number, "DeadLetterConfig": { "TargetArn": "string" }, "Description": "string", "Environment": { "Error": { "ErrorCode": "string", "Message": "string" }, "Variables": { "string" : "string" } }, "FunctionArn": "string", "FunctionName": "string", "Handler": "string", "KMSKeyArn": "string", "LastModified": "string", "Layers": [ { "Arn": "string", "CodeSize": number } ], "MasterArn": "string", "MemorySize": number, "RevisionId": "string", "Role": "string", "Runtime": "string", "Timeout": number, "TracingConfig": { "Mode": "string" }, "Version": "string", "VpcConfig": { "SecurityGroupIds": [ "string" ], "SubnetIds": [ "string" ], "VpcId": "string" } }, "Tags": { "string" : "string" } }

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.

Code

The function's code.

Type: FunctionCodeLocation object

Concurrency

The concurrent execution limit set for this function. For more information, see Managing Concurrency.

Type: Concurrency object

Configuration

The function's configuration.

Type: FunctionConfiguration object

Tags

Returns the list of tags associated with the function. For more information, see Tagging Lambda Functions in the AWS Lambda Developer Guide.

Type: String to string map

Errors

InvalidParameterValueException

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

ResourceNotFoundException

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

HTTP Status Code: 404

ServiceException

The AWS Lambda service encountered an internal error.

HTTP Status Code: 500

TooManyRequestsException

Request throughput limit exceeded

HTTP Status Code: 429

See Also

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