Amazon States Language - Amazon Step Functions
Services or capabilities described in Amazon Web Services documentation might vary by Region. To see the differences applicable to the China Regions, see Getting Started with Amazon Web Services in China.

Amazon States Language

The Amazon States Language is a JSON-based, structured language used to define your state machine, a collection of states, that can do work (Task states), determine which states to transition to next (Choice states), stop an execution with an error (Fail states), and so on.

For more information, see the Amazon States Language Specification and Statelint, a tool that validates Amazon States Language code.

To create a state machine on the Step Functions console using Amazon States Language, see Getting Started.


If you define your state machines outside the Step Functions' console, such as in an editor of your choice, you must save your state machine definitions with the extension .asl.json.

Example Amazon States Language Specification

{ "Comment": "An example of the Amazon States Language using a choice state.", "StartAt": "FirstState", "States": { "FirstState": { "Type": "Task", "Resource": "arn:aws-cn:lambda:us-east-1:123456789012:function:FUNCTION_NAME", "Next": "ChoiceState" }, "ChoiceState": { "Type" : "Choice", "Choices": [ { "Variable": "$.foo", "NumericEquals": 1, "Next": "FirstMatchState" }, { "Variable": "$.foo", "NumericEquals": 2, "Next": "SecondMatchState" } ], "Default": "DefaultState" }, "FirstMatchState": { "Type" : "Task", "Resource": "arn:aws-cn:lambda:us-east-1:123456789012:function:OnFirstMatch", "Next": "NextState" }, "SecondMatchState": { "Type" : "Task", "Resource": "arn:aws-cn:lambda:us-east-1:123456789012:function:OnSecondMatch", "Next": "NextState" }, "DefaultState": { "Type": "Fail", "Error": "DefaultStateError", "Cause": "No Matches!" }, "NextState": { "Type": "Task", "Resource": "arn:aws-cn:lambda:us-east-1:123456789012:function:FUNCTION_NAME", "End": true } } }