# Commands

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The **Commands** tab of a Module, provides a direct way to invoke specific functionality on a module without requiring a re-deployment.

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Think of the Commands Tab as an **interactive API testing console** built into the Nexus interface - allowing you to send JSON payloads to the module and receive immediate responses.

<figure><img src="/files/mhJvIXgzPntpg3lp348h" alt=""><figcaption><p>Showing the Commands page/tab for the FileTranferModule</p></figcaption></figure>

{% hint style="info" %}
The **Commands** tab is only available for modules that support the **Nexus SDK**
{% endhint %}

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### Key UI Elements

* **Command Drop-down** - Lists all available commands for the selected module
* **Refresh** – Updates the list of commands in case new ones are exposed
* **Show Schema** – Displays the JSON Schema defining the exact structure of the required payload
* **Payload Field** – A text editor where you insert the JSON payload that will be sent to the module
* **Send Payload** – Executes the selected command with the provided payload
* **Response Panel** – Displays the response returned by the module

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### How It Works

When a module is developed with the Nexus SDK, its developer can **expose one or more commands**.\
These commands become available in the **Commands** tab for that module.

From here, you can:

1. Select a command from the **Command** drop-down menu.
2. (Optional) Click **Show Schema** to see the JSON Schema for the expected payload format.

<figure><img src="/files/VSV5WZcan07Nuqf92xyk" alt=""><figcaption><p>Showing Json Schema for the ListBlobs Command of the FileTransferModule</p></figcaption></figure>

3. Enter/Fill out the JSON payload in the **Payload** section

<figure><img src="/files/ZBc0kgTBHig3b2Qyv7lv" alt=""><figcaption><p>Enter the expected Json payload based on the Schema</p></figcaption></figure>

4. Click **Send Payload** to execute the command on the module
5. View the **Response** in the right-hand panel

<figure><img src="/files/1vfP0u2A6CzUZymNUWiX" alt=""><figcaption><p>Showing the Response from sending the Payload to the Command</p></figcaption></figure>

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### Use Cases

The Commands tab is particularly useful for:

* **Debugging and Troubleshooting** – Test module behavior with different inputs to identify and resolve issues quickly.
* **Rapid Iteration** – Try different configurations or trigger specific actions without a full redeployment.
* **Operational Tasks** – Manually invoke data synchronization, file listing, or other module-specific functions.

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### Important Notes

* Only modules developed with the **Nexus SDK** will expose commands in this tab
* Payloads must strictly follow the JSON Schema format provided by **Show Schema**
* Incorrect payload formatting can result in command execution errors
* Changes made through commands are **runtime actions** - they do not permanently alter the module configuration unless the module is designed to store state


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