# PutFileSystemPolicy


Creates or replaces the IAM resource policy for an S3 File System to control access permissions.

## Request Syntax


```
PUT /file-systems/fileSystemId/policy HTTP/1.1
Content-type: application/json

{
   "policy": "string"
}
```

## URI Request Parameters


The request uses the following URI parameters.

 ** [fileSystemId](#API_S3Files_PutFileSystemPolicy_RequestSyntax) **   <a name="AmazonS3-S3Files_PutFileSystemPolicy-request-uri-fileSystemId"></a>
The ID or Amazon Resource Name (ARN) of the S3 File System to apply the resource policy to.  
Length Constraints: Minimum length of 0. Maximum length of 128.  
Pattern: `(arn:aws[-a-z]*:s3files:[0-9a-z-:]+:file-system/fs-[0-9a-f]{17,40}|fs-[0-9a-f]{17,40})`   
Required: Yes

## Request Body


The request accepts the following data in JSON format.

 ** [policy](#API_S3Files_PutFileSystemPolicy_RequestSyntax) **   <a name="AmazonS3-S3Files_PutFileSystemPolicy-request-policy"></a>
The JSON-formatted resource policy to apply to the file system. The policy defines the permissions for accessing the file system. The policy must be a valid JSON document that follows IAM policy syntax.  
Type: String  
Required: Yes

## Response Syntax


```
HTTP/1.1 200
```

## Response Elements


If the action is successful, the service sends back an HTTP 200 response with an empty HTTP body.

## Errors


 ** InternalServerException **   
An internal server error occurred. Retry your request.    
 ** errorCode **   
The error code associated with the exception.
HTTP Status Code: 500

 ** ResourceNotFoundException **   
The specified resource was not found. Verify that the resource exists and that you have permission to access it.    
 ** errorCode **   
The error code associated with the exception.
HTTP Status Code: 404

 ** ThrottlingException **   
The request was throttled. Retry your request using exponential backoff.    
 ** errorCode **   
The error code associated with the exception.
HTTP Status Code: 429

 ** ValidationException **   
The input parameters are not valid. Check the parameter values and try again.    
 ** errorCode **   
The error code associated with the exception.
HTTP Status Code: 400

## See Also


For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/s3files-2025-05-05/PutFileSystemPolicy) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/s3files-2025-05-05/PutFileSystemPolicy) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/s3files-2025-05-05/PutFileSystemPolicy) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/s3files-2025-05-05/PutFileSystemPolicy) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/s3files-2025-05-05/PutFileSystemPolicy) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/s3files-2025-05-05/PutFileSystemPolicy) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/s3files-2025-05-05/PutFileSystemPolicy) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/s3files-2025-05-05/PutFileSystemPolicy) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/s3files-2025-05-05/PutFileSystemPolicy) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/s3files-2025-05-05/PutFileSystemPolicy)