docs/workflows/executions/custom-executions-data.md

metadata

description: >-
  Add custom data to your workflow executions using the Code node. You can then
  filter executions by this data.
contentType: howto

Custom executions data

You can set custom data on your workflow using the Code node or the Execution Data node. 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.

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Set and access custom data using the Code node

This section describes how to set and access data using the Code node. Refer to Execution Data node 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

Set a single piece of extra data:

=== "JavaScript" js $execution.customData.set("key", "value"); === "Python" python _execution.customData.set("key", "value");

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

=== "JavaScript" js $execution.customData.setAll({"key1": "value1", "key2": "value2"}) === "Python" python _execution.customData.setAll({"key1": "value1", "key2": "value2"})

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

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

=== "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");
```

=== "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");
```