n8n-code-python

n8n Python Code nodes fail with ModuleNotFoundError because they only support the standard library, preventing external library imports. You must use standard-library-only Python or switch to JavaScript and dedicated n8n nodes for HTTP and database operations.

To return data from an n8n Python Code node safely, always format your output as a list of items like [{"json": ...}]. Returning the wrong structure is a frequent cause of runtime failures, so strictly enforce this list format for all transformations.

Access webhook JSON payloads in n8n Python Code nodes by referencing the nested _json['body'] dictionary. To prevent KeyError exceptions, safely extract fields from this payload using the .get() method instead of direct key access.

You cannot use external Python libraries for data transformation in n8n because the Python environment is restricted to the standard library. For external-library needs, switch to JavaScript or use dedicated n8n nodes for tasks like HTTP requests.

Read input items in n8n Python Code nodes using mode-aware functions like _input.all() for all items or _input.first() for the first item. In Each Item mode, use _input.item, and reference other nodes with the _node syntax.

The best way to handle empty inputs in n8n Python Code node transformations is to apply safe, production-ready patterns that emphasize .get()-based dictionary access. This prevents IndexError and KeyError exceptions during filtering, parsing, and aggregation tasks.