# SnsEventSourceProps

Properties forwarded to the Lambda Subscription.

Extends: SnsEventSourceProps
Extends: LambdaSubscriptionProps
Used as props by: SnsEventSource

- Source: [`aws-lambda-event-sources/lib/sns.ts`](https://github.com/aws/aws-cdk/blob/v2.277.0/packages/aws-cdk-lib/aws-lambda-event-sources/lib/sns.ts#L8)

## Example

```ts
import * as sns from 'aws-cdk-lib/aws-sns';
import { SnsEventSource } from 'aws-cdk-lib/aws-lambda-event-sources';

declare const topic: sns.Topic;
const deadLetterQueue = new sqs.Queue(this, 'deadLetterQueue');

declare const fn: lambda.Function;
fn.addEventSource(new SnsEventSource(topic, {
  filterPolicy: { },
  deadLetterQueue: deadLetterQueue,
}));
```

## Properties

- `deadLetterQueue`: [IQueue](/cdk/api/v2/docs/aws-cdk-lib.aws_sqs.IQueue.html) — Queue to be used as dead letter queue.

  **Default:** No dead letter queue enabled.

  If not passed no dead letter queue is enabled.

- `filterPolicy`: { [key: string]: [SubscriptionFilter](/cdk/api/v2/docs/aws-cdk-lib.aws_sns.SubscriptionFilter.html) } — The filter policy.

  **Default:** all messages are delivered

- `filterPolicyWithMessageBody`: { [key: string]: [FilterOrPolicy](/cdk/api/v2/docs/aws-cdk-lib.aws_sns.FilterOrPolicy.html) } — The filter policy that is applied on the message body.

  **Default:** all messages are delivered

  To apply a filter policy to the message attributes, use `filterPolicy`. A maximum of one of `filterPolicyWithMessageBody` and `filterPolicy` may be used.