AWS Lambda
Developer Guide

ListFunctions

Returns a list of your Lambda functions. For each function, the response includes the function configuration information. You must use GetFunction to retrieve the code for your function.

This operation requires permission for the lambda:ListFunctions action.

If you are using the versioning feature, you can list all of your functions or only $LATEST versions. For information about the versioning feature, see AWS Lambda Function Versioning and Aliases.

Request Syntax

GET /2015-03-31/functions/?FunctionVersion=FunctionVersion&Marker=Marker&MasterRegion=MasterRegion&MaxItems=MaxItems HTTP/1.1

URI Request Parameters

The request requires the following URI parameters.

FunctionVersion

Set to ALL to list all published versions. If not specified, only the latest unpublished version ARN is returned.

Valid Values: ALL

Marker

Optional string. An opaque pagination token returned from a previous ListFunctions operation. If present, indicates where to continue the listing.

MasterRegion

Specify a region (e.g. us-east-2) to only list functions that were created in that region, or ALL to include functions replicated from any region. If specified, you also must specify the FunctionVersion.

Pattern: ALL|[a-z]{2}(-gov)?-[a-z]+-\d{1}

MaxItems

Optional integer. Specifies the maximum number of AWS Lambda functions to return in response. This parameter value must be greater than 0. The absolute maximum of AWS Lambda functions that can be returned is 50.

Valid Range: Minimum value of 1. Maximum value of 10000.

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 200 Content-type: application/json { "Functions": [ { "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" } } ], "NextMarker": "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.

Functions

A list of Lambda functions.

Type: Array of FunctionConfiguration objects

NextMarker

A string, present if there are more functions.

Type: String

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

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: