> 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

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 %}