N8n Code Javascript

Write, review, or debug JavaScript in an n8n Code node. Use when a Code node is already in the workflow (editing it, fixing an error, choosing its mode, making it faster), or when a new one is justified: no native node fits (check the job-to-node table in using-n8n-mcp-skills first) and the job is on the closed list — loops or recursion no node expresses, state across runs, parsing no node handles, an allowlisted library, heavy all-items work, or one short node replacing 4+ glue nodes. Covers $input/$json/$node in code, this.helpers, Luxon, SplitInBatches loops, cross-iteration data, pairedIte

6,554 stars 1,077 forksSoftware Development

Install

skills CLI (Claude Code, Cursor, Codex and more)

npx skills add czlonkowski/n8n-skills --skill n8n-code-javascript

Manual install

git clone --depth 1 https://github.com/czlonkowski/n8n-skills.git /tmp/n8n-skills
mkdir -p ~/.claude/skills
cp -r /tmp/n8n-skills/skills/n8n-code-javascript ~/.claude/skills/n8n-code-javascript

Personal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.

From the SKILL.md

# JavaScript Code Node

Expert guidance for writing JavaScript code in n8n Code nodes.

---

## Before you write a Code node

A new Code node has to pass this gate first:

1. **Is there a native node for the job?** Check the job-to-node table in `using-n8n-mcp-skills`: Filter, IF / Switch,
   Summarize, Aggregate, Split Out, Merge, Compare Datasets, Remove Duplicates, Sort + Limit, Date & Time, XML / HTML /
   Extract From File / Convert To File, HTTP Request (pagination, batching) and Crypto cover most reaches for Code.
   Their configs are in `n8n-node-configuration` → NATIVE_NODES.md.
2. **Would a short expression in that node do?** One expression, no function body — the helper methods (`.pluck()`,
   `.sum()`, `.unique()`, `$ifEmpty()`, `.diffTo()`) are in `n8n-expression-syntax` and, on n8n-mcp 2.97.0+, in
   `tools_documentation({topic: "expression_helpers"})`. Several statements inside `{{ }}` count as code, so they belong
   here rather than in an Edit Fields field.
3. **Is the job on the closed list?** Loops or recursion no node expresses, state across runs
   (`$getWorkflowStaticData`), parsing no node handles, an allowlisted library, heavy all-items work (thousands of items,
   stated or measured), or one short Code node (~15 lines) replacing 4+ glue nodes that only reshape data.

If it passes, write the Code node and give it a note, so the next reader (and the review hooks) can see why:

Read the full skill on GitHub

Details

Skill name: n8n-code-javascript
Repository: czlonkowski/n8n-skills
Path: skills/n8n-code-javascript/SKILL.md
License: MIT
Repo updated: 24 October 2026
Listed in: VoltAgent/awesome-agent-skills

FAQ

What does the N8n Code Javascript skill do?

How do I install the N8n Code Javascript skill?

skills CLI (Claude Code, Cursor, Codex and more): npx skills add czlonkowski/n8n-skills --skill n8n-code-javascript. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.

Is N8n Code Javascript popular?

It lives in czlonkowski/n8n-skills, which has 6,554 GitHub stars and 1,077 forks, and is included in 1 curated skill list.

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