n8n-code-javascript

Writing JavaScript in an n8n Code node requires accessing webhook data via $input or $json patterns, applying custom transformations, and returning arrays like [{json: {id, name}}] to ensure correct downstream workflow execution.

The correct return format for n8n Code nodes is an array of objects structured as [{json: {id, name}}]. Using this specific format ensures your custom JavaScript logic passes data seamlessly to subsequent workflow nodes without structural errors.

n8n Code node failures with nested webhook data often stem from incorrect data access syntax or missing null checks. Properly referencing $json and validating webhook payloads before processing prevents these common structural and null reference errors.

Yes, you can use built-in functions in n8n Code nodes. Leverage $helpers.httpRequest() for API integration, $jmespath() for JSON querying, and DateTime (Luxon) for date manipulation to execute complex operations without external dependencies.

The best way to avoid common errors in n8n JavaScript Code nodes is to understand the top 5 pitfalls, including webhook data nesting and expression syntax confusion, by applying correct data access patterns and enforcing strict null checks.