Can I use Luxon for date manipulation in n8n?

Yes, n8n provides the Luxon library globally via the 'DateTime' object, allowing you to easily format dates, perform arithmetic, and generate ISO timestamps.

What is the required return format for an n8n Code node?

The Code node must always return an array of objects where each object contains a 'json' key. For example: return [{ json: { id: 1 } }];

Why does my n8n Code node return 'undefined' for webhook data?

In n8n, webhook data is nested under the .body property. You should access your data using $json.body.fieldName instead of accessing $json directly.

When should I use 'Run Once for All Items' mode?

Use this mode for 95% of use cases, including data aggregation, sorting, filtering, and any operation where you need to compare or combine multiple input items.

How do I make API calls inside an n8n Code node?

You can use the built-in $helpers.httpRequest() function, which supports various HTTP methods, headers, and body payloads directly within your script.

n8n JavaScript Code Expert

Name: n8n JavaScript Code Expert
Author: thanhtoan105

bythanhtoan105

•

Productivity & Workflow

Provides expert guidance and implementation patterns for writing efficient JavaScript within n8n workflow automation Code nodes.

About

This skill empowers developers to master the n8n Code node by providing optimized JavaScript snippets, data access patterns, and robust error prevention strategies. It simplifies complex workflow tasks such as multi-source data aggregation, API interaction via $helpers.httpRequest, and precise date manipulation using the Luxon library. By automating the application of n8n-specific syntax and return format requirements, this skill ensures that custom logic integrates seamlessly within larger automation pipelines, reducing debugging time and performance bottlenecks.

Key Features

Pre-built patterns for data aggregation, filtering, and JSON normalization
Automated validation of return formats to prevent workflow execution failures
Built-in support for Luxon DateTime and JMESPath query syntax
Optimized transformation logic for 'Run Once for All Items' and 'Each Item' modes
Standardized n8n data access patterns including $input.all() and $node references
1 GitHub stars

Use Cases

Aggregating data from multiple API endpoints into a single summarized report
Implementing custom business logic and conditional filtering that exceeds standard node capabilities
Normalizing and restructuring complex webhook payloads for CRM or database entry

About

Key Features

Pre-built patterns for data aggregation, filtering, and JSON normalization
Automated validation of return formats to prevent workflow execution failures
Built-in support for Luxon DateTime and JMESPath query syntax
Optimized transformation logic for 'Run Once for All Items' and 'Each Item' modes
Standardized n8n data access patterns including $input.all() and $node references
1 GitHub stars

Use Cases

Aggregating data from multiple API endpoints into a single summarized report
Implementing custom business logic and conditional filtering that exceeds standard node capabilities
Normalizing and restructuring complex webhook payloads for CRM or database entry