n8n-code-python

Guide Python code in n8n Code nodes with correct data access and return structure.

84|23|Updated May 6, 2026

Search Tags:#python #data transformation #error prevention #n8n #code node #standard library #webhook parsing

Ready to run

npx skills add https://github.com/MorrisLu-Taipei/TigerAI-n8n-Skill-Pack --skill n8n-code-python-morrislu-taipei

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: n8n-code-python
Source: https://github.com/MorrisLu-Taipei/TigerAI-n8n-Skill-Pack/tree/main/skills/_vendor/n8n-code-python
Command: npx skills add https://github.com/MorrisLu-Taipei/TigerAI-n8n-Skill-Pack --skill n8n-code-python-morrislu-taipei

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

This Skill prevents failed n8n executions caused by common Python Code-node mistakes by teaching the correct input access patterns, return format, webhook payload structure, and the “no external libraries” constraint.

Core Features & Use Cases

No-external-libraries guardrail: Avoids ModuleNotFoundError by making it clear which standard-library modules are available and when to switch to JavaScript or n8n built-in nodes.
Correct data access in Python Code nodes: Guides users on using _input.all(), _input.first(), _input.item, and _node references (and clarifies webhook data nesting under _json["body"]).
Reliable output formatting & error prevention: Ensures Code nodes always return data in the required [{"json": {...}}] structure and explains how to avoid KeyError, IndexError, and missing-return failures.

Quick Start

Ask the AI: "I’m writing a Python Code node in n8n—how do I safely read webhook data from _json['body'], process multiple items using _input.all(), and return results as [{'json': ...}] without using external libraries?"

Frequently Asked Questions about n8n-code-python

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I prevent ModuleNotFoundError when running Python code in n8n?▼

To prevent ModuleNotFoundError in n8n Python Code nodes, use only standard-library modules. External libraries are not supported, so switch to JavaScript or built-in n8n nodes if you need third-party packages.

How do I access webhook payload data in an n8n Python Code node?▼

Access webhook payload data in n8n Python Code nodes by referencing `_json['body']`. Webhook payloads are nested under the body key, preventing KeyError when extracting incoming request data for processing.

What is the correct return format for Python Code nodes in n8n?▼

The correct return format for n8n Python Code nodes is a list of dictionaries like `[{'json': {...}}]`. Ensuring this exact structure prevents missing-return failures and allows downstream nodes to parse data correctly.

How do I process multiple items in an n8n Python Code node?▼

Process multiple items in n8n Python Code nodes using `_input.all()` to retrieve all input items. Use `_input.first()` or `_input.item` for single-item access, preventing IndexError during data transformation.

Why does my n8n Python Code node fail with a KeyError?▼

n8n Python Code nodes fail with a KeyError when accessing missing dictionary keys. Prevent this by validating data existence and using correct `_input` and `_node` references before extracting values for data parsing.

Can I use pandas for data transformation in an n8n Python Code node?▼

You cannot use pandas in n8n Python Code nodes because external libraries cause ModuleNotFoundError. Use standard-library-only modules for data transformation, or switch to JavaScript or built-in n8n nodes for advanced processing.