Where is webhook data located in expressions?

Webhook payloads appear under $json.body rather than directly on $json.

Can this skill help with AI Agent Code Tools?

No, a separate skill exists specifically for the toolCode node used by AI Agents.

Which input methods are recommended?

Use $input.all(), $input.first(), or $input.item depending on the number of items needed.

czlonkowski/n8n-code-javascript

Expert guidance for writing reliable JavaScript inside n8n Code nodes.

SkillsAgent Skills 5.4kOpen source

View on GitHub

Updated 2026-06-16

czlonkowski/n8n-code-javascript GitHub repository

What is czlonkowski/n8n-code-javascript?

The n8n Code JavaScript skill provides targeted instructions for building effective JavaScript logic within n8n automation workflows. It focuses on proper use of input methods, date handling, HTTP requests via helpers, and JMESPath queries while highlighting critical syntax requirements.

It works by activating during Code node editing to supply data access examples, error solutions, and formatting rules that prevent common failures. The skill emphasizes returning data as an array of objects and explains webhook payload locations to avoid repeated mistakes.

It is intended for developers and automation builders who integrate custom JavaScript into n8n workflows and need reliable patterns to reduce debugging time and validation issues.

What you can build with czlonkowski/n8n-code-javascript

Data transformation in Code nodes

Access all or specific input items and return properly formatted JSON arrays for downstream nodes.

HTTP requests with helpers

Use built-in $helpers to make external calls while managing dates and query results inside workflows.

Error troubleshooting

Identify and fix the top error patterns that account for most Code node failures during execution.

Install czlonkowski/n8n-code-javascript

Quick start

# Install directly as a Claude Code plugin
/plugin install czlonkowski/n8n-skills

1Clone the n8n-skills repository from GitHub.
2Load the n8n Code JavaScript skill file into your Claude Code environment.
3Activate the skill when editing any Code node in an n8n workflow.
4Follow the provided patterns for data access and return statements.
5Test the workflow and apply fixes from the documented error catalog.