> ## Documentation Index
> Fetch the complete documentation index at: https://docs.collabase.ch/llms.txt
> Use this file to discover all available pages before exploring further.

# Code

> Run custom JavaScript logic as a step in your automation.

# Code

Execute arbitrary JavaScript inside an automation step. Use it when built-in connectors and Transform nodes are not expressive enough for a transformation or calculation.

## Authentication

**Auth type:** None

## How it works

The Code node runs in an isolated sandbox via the Collabase code-runner microservice. Write a function that receives the step's `inputs` and returns an object — the returned keys become the node's output variables.

```javascript theme={"dark"}
// Example: calculate a due date 7 days from now
const dueDate = new Date(inputs.startDate);
dueDate.setDate(dueDate.getDate() + 7);
return {
  dueDate: dueDate.toISOString(),
  dueDateFormatted: dueDate.toLocaleDateString("de-CH")
};
```

## Fields

| Field              | Description                                                                                                                         |
| ------------------ | ----------------------------------------------------------------------------------------------------------------------------------- |
| **Code**           | JavaScript function body. `inputs` is available as a pre-bound object containing all mapped input variables. Return a plain object. |
| **Input mappings** | Variables from previous nodes mapped to `inputs` keys                                                                               |
| **Timeout**        | Maximum execution time in milliseconds (default: 5000)                                                                              |

<Warning>
  The Code node does not have access to Node.js built-ins like `fs`, `http`, or `require`. Network access is blocked inside the sandbox. For external HTTP calls, use the **HTTP** connector instead.
</Warning>

<Tip>
  For complex multi-step transformations that need external libraries, use the **Python** node (AI Microservices) or the **HTTP** connector to call a dedicated function endpoint.
</Tip>