Is there a built-in library for date manipulation?

Yes, the Luxon library is available via the 'DateTime' object, allowing for easy date formatting, arithmetic, and timezone management.

How do I access webhook data correctly in n8n?

Webhook data is typically nested under the 'body' property. Use $json.body or $input.first().json.body instead of accessing $json directly.

What is the mandatory return format for n8n Code nodes?

You must always return an array of objects where each object contains a 'json' property, for example: return [{json: {data: 'value'}}].

Should I use 'Run Once for All Items' or 'Run Once for Each Item' mode?

Use 'Run Once for All Items' for 95% of use cases, including aggregation, filtering, and batch processing. Use 'Each Item' only when logic is strictly independent per item.

Can I make external HTTP requests inside the Code node?

Yes, n8n provides the $helpers.httpRequest() function specifically for making asynchronous API calls directly from your JavaScript code.

n8n JavaScript Code Node

Name: n8n JavaScript Code Node
Author: sromeroubisos

bysromeroubisos

0•

Productivity & Workflow

Provides expert guidance and implementation patterns for writing robust JavaScript within n8n Code nodes.

This skill empowers developers to master n8n's Code node by providing clear instructions on data access patterns, return format requirements, and built-in helper functions. It addresses common pitfalls like incorrect webhook data nesting and return structures, ensuring automation workflows run reliably. Whether you are performing complex data transformations, making custom API calls via $helpers.httpRequest, or managing dates with Luxon, this skill offers the specific syntax and best practices needed to build production-grade n8n automations.

Key Features

01Common error prevention patterns for webhooks and expression syntax

020 GitHub stars

03Standardized data access patterns using $input.all, $input.first, and $input.item

04Mode selection guidance for 'All Items' versus 'Each Item' execution

05Built-in support for $helpers.httpRequest and Luxon (DateTime) operations

06Strict return format validation to prevent workflow execution failures

Use Cases

01Normalizing and transforming data from disparate API sources into a unified format

02Aggregating large datasets from webhooks for custom reporting and statistics

03Implementing complex conditional logic and data filtering not possible with standard nodes

Key Features

01Common error prevention patterns for webhooks and expression syntax

020 GitHub stars

03Standardized data access patterns using $input.all, $input.first, and $input.item

04Mode selection guidance for 'All Items' versus 'Each Item' execution

05Built-in support for $helpers.httpRequest and Luxon (DateTime) operations

06Strict return format validation to prevent workflow execution failures

Use Cases

01Normalizing and transforming data from disparate API sources into a unified format

02Aggregating large datasets from webhooks for custom reporting and statistics

03Implementing complex conditional logic and data filtering not possible with standard nodes