# N8n Code Javascript

> Write JavaScript code in n8n Code nodes. Use when writing JavaScript in n8n, using $input/$json/$node syntax, making HTTP requests with $helpers, working with dates using DateTime, troubleshooting Code node errors, or choosing between Code node modes.

- Skill: `francostino/n8n-code-javascript` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add francostino/n8n-code-javascript`
- Raw SKILL.md: https://api.skillmd.com/api/skills/francostino/n8n-code-javascript/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: FrancoStino (https://skillmd.com/u/francostino)
- Updated: 2026-09-08
- Page: https://skillmd.com/skills/francostino/n8n-code-javascript

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# JavaScript Code Node

Expert guidance for writing JavaScript code in n8n Code nodes.

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## Detailed Guide

Read [the detailed guide](references/detailed-guide.md) before executing this skill. It retains the complete procedure and reference material. Treat its safety, prerequisites, and validation requirements as mandatory. For focused work, load the relevant sections; for end-to-end work, read the guide completely.

## When to Use Code Node

Use Code node when:
- ✅ Complex transformations requiring multiple steps
- ✅ Custom calculations or business logic
- ✅ Recursive operations
- ✅ API response parsing with complex structure
- ✅ Multi-step conditionals
- ✅ Data aggregation across items

Consider other nodes when:
- ❌ Simple field mapping → Use **Set** node
- ❌ Basic filtering → Use **Filter** node
- ❌ Simple conditionals → Use **IF** or **Switch** node
- ❌ HTTP requests only → Use **HTTP Request** node

**Code node excels at**: Complex logic that would require chaining many simple nodes

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## Limitations
- Use this skill only when the task clearly matches the scope described above.
- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.