n8n-code-javascript

Overview

The n8n Code JavaScript skill provides expert guidance for writing JavaScript code within n8n Code nodes. It covers essential patterns like data access with $input/$json/$node syntax, HTTP requests with $helpers, date handling with DateTime (Luxon), and the critical requirement of returning data in the correct [{json: {...}}] format.

Key Features

• Mode Selection Guide - Clear decision framework for choosing between "Run Once for All Items" (recommended for 95% of cases) and "Run Once for Each Item" modes
• Essential Data Access Patterns - Instructions for using $input.all(), $input.first(), and $input.item for different execution modes
• Built-in Helpers - Coverage of $helpers.httpRequest(), DateTime (Luxon), and $jmespath() utilities available in Code nodes
• Critical Gotchas - Warnings about common pitfalls including webhook data being under $json.body and the mandatory [{json: {...}}] return format
• Practical Templates - Ready-to-use code templates for aggregation, filtering, batch processing, and per-item transformations

Who is this for?

This skill is for n8n workflow builders who need to write custom JavaScript logic within Code nodes. It is particularly helpful for developers transitioning from other automation platforms to n8n who need to understand the specific syntax and data access patterns unique to n8n's Code node environment.