> For the complete documentation index, see [llms.txt](https://docs.n8n.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.n8n.io/build/understand-workflows/understand-executions/customize-executions-data.md).

# Customize executions data

Add custom data to your workflow executions using the Code node. You can then filter executions by this data.

You can set custom data on your workflow using the Code node or the [Execution Data node](/integrations/builtin/core-nodes/n8n-nodes-base.executiondata.md). n8n records this with each execution. You can then use this data when filtering the executions list, or fetch it in your workflows using the Code node.

{% hint style="info" %}
**Feature availability**

Custom executions data is available on:

* Cloud: Pro, Enterprise
* Self-Hosted: Enterprise, registered Community
  {% endhint %}

## Set and access custom data using the Code node <a href="#set-and-access-custom-data-using-the-code-node" id="set-and-access-custom-data-using-the-code-node"></a>

This section describes how to set and access data using the Code node. Refer to [Execution Data node](/integrations/builtin/core-nodes/n8n-nodes-base.executiondata.md) for information on using the Execution Data node to set data. You can't retrieve custom data using the Execution Data node.

### Set custom executions data <a href="#set-custom-executions-data" id="set-custom-executions-data"></a>

Set a single piece of extra data:

{% tabs %}
{% tab title="JavaScript" %}

```js
$execution.customData.set("key", "value");
```

{% endtab %}

{% tab title="Python" %}

```python
_execution.customData.set("key", "value");
```

{% endtab %}
{% endtabs %}

Set all extra data. This overwrites the whole custom data object for this execution:

{% tabs %}
{% tab title="JavaScript" %}

```js
$execution.customData.setAll({"key1": "value1", "key2": "value2"})
```

{% endtab %}

{% tab title="Python" %}

```python
_execution.customData.setAll({"key1": "value1", "key2": "value2"})
```

{% endtab %}
{% endtabs %}

There are limitations:

* They must be strings
* `key` has a maximum length of 50 characters
* `value` has a maximum length of 255 characters
* n8n supports a maximum of 10 items of custom data

### Access the custom data object during execution <a href="#access-the-custom-data-object-during-execution" id="access-the-custom-data-object-during-execution"></a>

You can retrieve the custom data object, or a specific value in it, during an execution:

{% tabs %}
{% tab title="JavaScript" %}

```js
// Access the current state of the object during the execution
const customData = $execution.customData.getAll();

// Access a specific value set during this execution
const customData = $execution.customData.get("key");
```

{% endtab %}

{% tab title="Python" %}

```python
# Access the current state of the object during the execution
customData = _execution.customData.getAll();

# Access a specific value set during this execution
customData = _execution.customData.get("key");
```

{% endtab %}
{% endtabs %}

## Related resources

* [Understand executions](/build/understand-workflows/understand-executions.md)
* [Manual, partial, and production executions](/build/understand-workflows/understand-executions/types-of-executions.md)
* [View all executions](/build/understand-workflows/understand-executions/view-all-executions.md)
* [View executions for a single workflow](/build/understand-workflows/understand-executions/view-executions-for-a-single-workflow.md)
* [Debug and re-run past executions](/build/understand-workflows/understand-executions/debug-executions.md)
* [Stream real-time responses](/build/understand-workflows/understand-executions/stream-real-time-responses.md)
* [Dirty nodes](/build/understand-workflows/understand-executions/understand-dirty-nodes.md)