n8n-code-python

Access webhook data in an n8n Python Code node by using _input.all() or _input.first() to retrieve items, then safely extract fields from _json using dictionary .get() methods to prevent missing key errors.

External Python libraries are not available in n8n Code nodes. You must write Python scripts using only the standard library, avoiding third-party imports to ensure workflows execute without module dependency errors.

Python code in n8n fails when it does not return a list of items in the correct n8n format. Ensure your script outputs a list of dictionaries matching the expected JSON structure for successful workflow execution.

All Items mode processes the entire batch of input items at once in your Python code, while Each Item mode executes the script individually for every item, affecting how _input and _json data are accessed.

Prevent KeyError exceptions in n8n Python Code nodes by using safe dictionary access with the .get() method instead of direct key indexing, ensuring missing fields return None rather than crashing the workflow.

Write Python scripts in n8n to transform webhook payloads by accessing the _input data, applying standard library functions for validation and transformation, and returning a properly formatted list of items.