# Code Tool - Workflow node | Docs - nodulz

Source: https://nodulz.com/docs/nodes/ai_tool_code

Language: en

Tool that runs JavaScript

## Usage and specifics

Connect this tool to an agent tool port. name and description help the model select it; configure sources, templates and limits before calling. requireApproval, where available, controls operations requiring approval.

Technical type : `ai_tool_code`. Runtime : `nodulz`.

## Credentials and prerequisites

This node defines no dedicated external credential. Remote sources or execution targets may still need their own access credentials.

See the [credentials guide](/docs/credentials) if a remote source or execution target requires access.

## Parameters

Names below are technical keys. Defaults are not a ready-to-run configuration: complete fields required by your operation. Paths containing [] describe list items; some fields depend on the selected mode.

| Parameter | Type | Default | Values / limits |
| --- | --- | --- | --- |
| `name` | `string` | `"code_tool"` | - |
| `description` | `string` | `"Run JavaScript code"` | - |
| `script` | `string` | `"return args;"` | - |
| `parametersJson` | `string` | `""` | - |
| `timeoutMs` | `number` | `5000` | -; ≥ 100 |
| `requireApproval` | `boolean` | `false` | - |

## Initial configuration

Initial catalog configuration example, to adapt before running. Keep secrets in credentials.

```json
{
  "name": "code_tool",
  "description": "Run JavaScript code",
  "script": "return args;",
  "parametersJson": "",
  "timeoutMs": 5000,
  "requireApproval": false
}
```

## Verification

Test with representative data. Check node output in the inspector and logs, then use editor mapping for downstream fields. A trigger test with a simulated payload does not validate external service delivery.

See also : [Expressions and data](/docs/expressions), [Executions](/docs/executions), [Node catalog](/docs/nodes).

## Explore further

- [Features - nodulz](https://nodulz.com/product/overview)
- [Node catalog - nodulz](https://nodulz.com/product/catalog)
- [MCP server - nodulz](https://nodulz.com/product/mcp)
- [Pricing - nodulz](https://nodulz.com/pricing)
- [Use cases and workflow automation - nodulz](https://nodulz.com/use-cases)
- [Choose what your workflows can do. - nodulz](https://nodulz.com/compare)
- [Documentation - nodulz](https://nodulz.com/docs)