n8n-code-javascript

Writing JavaScript in n8n Code nodes requires returning an array of objects where each has a json property. You access data using $input patterns like $input.all() or $input.first() to perform complex data transformations directly within your workflow.

Run Once for All Items processes all incoming data in a single execution batch, while Run Once for Each Item executes your JavaScript code individually for every item. Choose the first for batch transformations and the second for isolated item processing.

Webhook data inside an n8n Code node is accessed under the .body property of the incoming item. You must implement safe null checks when parsing this data to ensure your automation code remains production-ready and avoids execution errors.

Yes, you can use Luxon DateTime and $jmespath inside n8n Code nodes. These built-ins allow you to handle complex date formatting and query JSON data structures efficiently without relying on external scripts or additional nodes.

You make HTTP requests inside an n8n Code node by leveraging the $helpers.httpRequest() function. This allows you to perform API interactions, fetch external data, and enrich your workflow results within a single JavaScript execution block.

An n8n Code node returns a validation error when your JavaScript output lacks the correct return structure. You must return an array of objects, ensuring each object specifically contains a json property, to pass data successfully to the next node.