AWS Lambda
Developer Guide


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.


Optional string. If not specified, only the unqualified functions ARNs (Amazon Resource Names) will be returned.

Valid value:

ALL: Will return all versions, including $LATEST which will have fully qualified ARNs (Amazon Resource Names).

Valid Values: ALL


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


Optional string. If not specified, will return only regular function versions (i.e., non-replicated versions).

Valid values are:

The region from which the functions are replicated. For example, if you specify us-east-1, only functions replicated from that region will be returned.

ALL: Will return all functions from any region. If specified, you also must specify a valid FunctionVersion parameter.

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


Optional integer. Specifies the maximum number of AWS Lambda functions to return in response. This parameter value must be greater than 0.

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", "MasterArn": "string", "MemorySize": number, "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.


A list of Lambda functions.

Type: Array of FunctionConfiguration objects


A string, present if there are more functions.

Type: String



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. You will also get this exception if you have selected a deprecated runtime, such as Node v0.10.42.

HTTP Status Code: 400


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: