---
title: "Post to SNS Topic"
slug: "post-to-sns-topic"
updated: 2025-09-02T20:07:52Z
published: 2025-09-02T20:07:52Z
canonical: "documentation.decisions.com/post-to-sns-topic"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://documentation.decisions.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Post to SNS Topic

| Step Details |
| --- |
| **Introduced in Version** | 3.0.0 |
| **Last Modified in Version** | 8.9.0 |
| **Location** | Integration > Amazon AWS > SMS |

The **Post to SNS Topic** step is used to take an inputted string of text and output it to SNS and is then posted.

### Prerequisites

- This step requires the [Amazon AWS Module](https://documentation.decisions.com/docs/aws) to be [installed](https://documentation.decisions.com/docs/installing-modules-decisions) before it will be available in the toolbox, and an active [AWS account](https://signin.aws.amazon.com/signin?redirect_uri=https%3A%2F%2Fconsole.aws.amazon.com%2Fconsole%2Fhome%3FhashArgs%3D%2523%26isauthcode%3Dtrue%26nc2%3Dh_ct%26src%3Dheader-signin%26state%3DhashArgsFromTB_eu-north-1_c1412528899e4833&client_id=arn%3Aaws%3Asignin%3A%3A%3Aconsole%2Fcanvas&forceMobileApp=0&code_challenge=HQku5BPrRUboP5p1wGr4Ai_nBIQNSqsR2eHJNCBfxhQ&code_challenge_method=SHA-256). The [Amazon WebServices Settings](https://documentation.decisions.com/docs/setting-up-amazon-webservices-integration) must also be configured.
- A [dependency](https://documentation.decisions.com/docs/project-dependencies) must be created after installing the module in order for the Step to be used.

---

## Properties

#### Settings

| Property | Description | Data Type |
| --- | --- | --- |
| Topic Name | Name defined in SNS to be selected from a dropdown to define the topic. | String |

#### Inputs

| Property | Description | Data Type |
| --- | --- | --- |
| Message Text | The body of the message to be posted to SNS. | String |

#### Outputs

| Property | Description | Data Type |
| --- | --- | --- |
| Message ID | Outputs completed step information. | String |

![](https://cdn.document360.io/6ef8bcc1-6489-4486-9ad1-83acff7e5df0/Images/Documentation/2025-08-13_14h54_37.png)

---

## Common Errors

### Topic Cannot Be Empty

If the topic has not been inputted, the step will cause an error. To correct this, input a topic into it's designated section under Settings.

#### Exception Message:

```csharp
DecisionsFramework.BusinessRuleException: [BusinessRule] You have to pick a Topic, it cannot be empty at Decisions.AWS.SNS.SnsUtilities.PublishToTopic(String messageText, SnsTopic actualTopic, String messageGroupId, String messageDeduplicationId)
 at Decisions.AWS.SNS.PostSnsMessage.Run(StepStartData data)
 at DecisionsFramework.Design.Flow.FlowStep.RunStepInternal(String flowTrackingID, String stepTrackingID, KeyValuePairDataStructure[] stepRunDataValues, AbstractFlowTrackingData trackingData)
 at DecisionsFramework.Design.Flow.FlowStep.Start(String flowTrackingID, String stepTrackingID, FlowStateData data, AbstractFlowTrackingData trackingData, RunningStepData currentStepData)
```

---