Why does my n8n Code node return an error even with valid JavaScript?

n8n requires a specific return structure: an array of objects where each object contains a 'json' key (e.g., return [{json: {data: 'value' }}]). This skill helps you format these correctly.

How do I access data from previous nodes in n8n?

You should use the modern $input.all() to retrieve all items or $input.first() for a single item. This skill provides the correct syntax for various data access patterns.

What is the difference between 'Run Once for All Items' and 'Run Once for Each Item'?

'All Items' executes once for the entire dataset, making it ideal for aggregation and filtering, while 'Each Item' runs separately for every record, which is useful for independent item processing.

Can I make API calls directly inside an n8n Code node?

Yes, you can use the built-in $helpers.httpRequest() function. This skill provides syntax examples for making authenticated requests within your custom code.

How do I handle webhook data in n8n Code nodes?

A common mistake is accessing webhook data directly; it is actually nested under $json.body. This skill includes specific patterns to handle this nesting correctly.

n8n JavaScript Code Expert

Name: n8n JavaScript Code Expert
Author: sromeroubisos

bysromeroubisos

0•

生产力与工作流

Provides expert guidance for writing and optimizing JavaScript within n8n Code nodes using specialized data access patterns and return formats.

The n8n JavaScript Code Expert skill is a specialized resource for developers building complex automations in n8n. It simplifies the nuances of n8n's internal JavaScript environment, helping users master the transition between execution modes, correct data access via $input and $node, and mandatory return structures. By providing templates for common operations—such as multi-source data aggregation, Luxon-based date manipulation, and built-in HTTP helpers—this skill eliminates common pitfalls like webhook nesting errors and missing JSON wrappers, ensuring robust and performant workflow executions.

主要功能

01Standardized templates for $input.all(), $input.first(), and $node syntax.

02Error prevention logic for common webhook and data-nesting mistakes.

03Strict validation for n8n's required array-of-objects return format.

04Guidance on selecting between 'Run Once for All Items' and 'Each Item' modes.

050 GitHub stars

06Integration support for built-in libraries like Luxon (DateTime) and $jmespath.

使用场景

01Aggregating, filtering, and normalizing data from multiple API responses in a single workflow step.

02Formatting and cleaning incoming webhook payloads before sending them to external databases or CRMs.

03Implementing complex business logic and data transformations that exceed the capability of standard n8n nodes.

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add sromeroubisos/grupo-22-scores n8n-code-javascript

For use in Claude.ai and ChatGPT

主要功能

01Standardized templates for $input.all(), $input.first(), and $node syntax.

02Error prevention logic for common webhook and data-nesting mistakes.

03Strict validation for n8n's required array-of-objects return format.

04Guidance on selecting between 'Run Once for All Items' and 'Each Item' modes.

050 GitHub stars

06Integration support for built-in libraries like Luxon (DateTime) and $jmespath.

使用场景

01Aggregating, filtering, and normalizing data from multiple API responses in a single workflow step.

02Formatting and cleaning incoming webhook payloads before sending them to external databases or CRMs.

03Implementing complex business logic and data transformations that exceed the capability of standard n8n nodes.