This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html).

# AWS::Bedrock::Flow FlowNodeInput
<a name="aws-properties-bedrock-flow-flownodeinput"></a>

Contains configurations for an input in an Amazon Bedrock Flows node.

## Syntax
<a name="aws-properties-bedrock-flow-flownodeinput-syntax"></a>

To declare this entity in your CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-bedrock-flow-flownodeinput-syntax.json"></a>

```
{
  "[Category](#cfn-bedrock-flow-flownodeinput-category)" : String,
  "[Expression](#cfn-bedrock-flow-flownodeinput-expression)" : String,
  "[Name](#cfn-bedrock-flow-flownodeinput-name)" : String,
  "[Type](#cfn-bedrock-flow-flownodeinput-type)" : String
}
```

### YAML
<a name="aws-properties-bedrock-flow-flownodeinput-syntax.yaml"></a>

```
  [Category](#cfn-bedrock-flow-flownodeinput-category): String
  [Expression](#cfn-bedrock-flow-flownodeinput-expression): String
  [Name](#cfn-bedrock-flow-flownodeinput-name): String
  [Type](#cfn-bedrock-flow-flownodeinput-type): String
```

## Properties
<a name="aws-properties-bedrock-flow-flownodeinput-properties"></a>

`Category`  <a name="cfn-bedrock-flow-flownodeinput-category"></a>
Specifies how input data flows between iterations in a DoWhile loop.  
+ `LoopCondition` - Controls whether the loop continues by evaluating condition expressions against the input data. Use this category to define the condition that determines if the loop should continue. 
+ `ReturnValueToLoopStart` - Defines data to pass back to the start of the loop's next iteration. Use this category for variables that you want to update for each loop iteration.
+ `ExitLoop` - Defines the value that's available once the loop ends. Use this category to expose loop results to nodes outside the loop.
*Required*: No  
*Type*: String  
*Allowed values*: `LoopCondition | ReturnValueToLoopStart | ExitLoop`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Expression`  <a name="cfn-bedrock-flow-flownodeinput-expression"></a>
An expression that formats the input for the node. For an explanation of how to create expressions, see [Expressions in Prompt flows in Amazon Bedrock](https://docs.aws.amazon.com/bedrock/latest/userguide/flows-expressions.html).  
*Required*: Yes  
*Type*: String  
*Minimum*: `1`  
*Maximum*: `64`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Name`  <a name="cfn-bedrock-flow-flownodeinput-name"></a>
Specifies a name for the input that you can reference.  
*Required*: Yes  
*Type*: String  
*Pattern*: `^[a-zA-Z]([_]?[0-9a-zA-Z]){1,50}$`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Type`  <a name="cfn-bedrock-flow-flownodeinput-type"></a>
Specifies the data type of the input. If the input doesn't match this type at runtime, a validation error will be thrown.  
*Required*: Yes  
*Type*: String  
*Allowed values*: `String | Number | Boolean | Object | Array`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)