n8n JavaScript Code Expert FAQs

Question 1

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

Accepted Answer

You can use the built-in `$helpers.httpRequest()` method, which allows you to perform async requests with custom headers and methods directly within your JavaScript logic.

Question 2

How do I access data from a Webhook node in n8n?

Accepted Answer

Webhook data is uniquely nested under the body property. Use `$json.body.your_field` or `$input.first().json.body` to access incoming data correctly.

Question 3

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

Accepted Answer

'Run Once for All Items' executes once for the entire dataset (best for aggregation), while 'Run Once for Each Item' loops and executes the code separately for every input item.

Question 4

Why is my n8n Code node returning an error?

Accepted Answer

The most common cause is the return format. Ensure your code returns an array of objects in the `[{json: {}}]` structure; returning a single object or raw data will cause a failure.

Question 5

Can I use Luxon for date manipulation in n8n?

Accepted Answer

Yes, n8n includes Luxon by default. You can use the `DateTime` object for complex operations like `DateTime.now().toFormat('yyyy-MM-dd')` without importing external libraries.

n8n JavaScript Code Expert

Key Features

Use Cases

n8n JavaScript Code Expert

Key Features

Use Cases