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::AppFlow::Flow S3SourceProperties
<a name="aws-properties-appflow-flow-s3sourceproperties"></a>

 The properties that are applied when Amazon S3 is being used as the flow source. 

## Syntax
<a name="aws-properties-appflow-flow-s3sourceproperties-syntax"></a>

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

### JSON
<a name="aws-properties-appflow-flow-s3sourceproperties-syntax.json"></a>

```
{
  "[BucketName](#cfn-appflow-flow-s3sourceproperties-bucketname)" : String,
  "[BucketPrefix](#cfn-appflow-flow-s3sourceproperties-bucketprefix)" : String,
  "[S3InputFormatConfig](#cfn-appflow-flow-s3sourceproperties-s3inputformatconfig)" : S3InputFormatConfig
}
```

### YAML
<a name="aws-properties-appflow-flow-s3sourceproperties-syntax.yaml"></a>

```
  [BucketName](#cfn-appflow-flow-s3sourceproperties-bucketname): String
  [BucketPrefix](#cfn-appflow-flow-s3sourceproperties-bucketprefix): String
  [S3InputFormatConfig](#cfn-appflow-flow-s3sourceproperties-s3inputformatconfig): 
    S3InputFormatConfig
```

## Properties
<a name="aws-properties-appflow-flow-s3sourceproperties-properties"></a>

`BucketName`  <a name="cfn-appflow-flow-s3sourceproperties-bucketname"></a>
 The Amazon S3 bucket name where the source files are stored.   
*Required*: Yes  
*Type*: String  
*Pattern*: `\S+`  
*Minimum*: `3`  
*Maximum*: `63`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`BucketPrefix`  <a name="cfn-appflow-flow-s3sourceproperties-bucketprefix"></a>
 The object key for the Amazon S3 bucket in which the source files are stored.   
*Required*: Yes  
*Type*: String  
*Maximum*: `512`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`S3InputFormatConfig`  <a name="cfn-appflow-flow-s3sourceproperties-s3inputformatconfig"></a>
 When you use Amazon S3 as the source, the configuration format that you provide the flow input data.   
*Required*: No  
*Type*: [S3InputFormatConfig](aws-properties-appflow-flow-s3inputformatconfig.md)  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

## See also
<a name="aws-properties-appflow-flow-s3sourceproperties--seealso"></a>
+ [S3SourceProperties](https://docs.aws.amazon.com/appflow/1.0/APIReference/API_S3SourceProperties.html) in the *Amazon AppFlow API Reference*.