Run Node.js Code

Execute a Node.js snippet in an isolated sandbox and return the value of result.

When to use

• JSON manipulation — parse, transform, or validate JSON payloads with native JS tooling.
• String processing — use regex, template literals, or Buffer operations.
• Lightweight scripting — run any logic that benefits from the Node.js standard library.

Inputs & outputs

Input modality	Any (named variable bindings via vars)
Output modality	Text / JSON (the value of result after execution)
Max source length	50 000 characters
Max timeout	30 seconds

Parameters

Param	Required	Description
source	yes	Node.js source code (1–50 000 chars). Must assign to result.
timeout_seconds	no	Execution time limit in seconds (1–30). Default: 5

Input

Field	Description
vars	Dictionary of named bindings injected as local variables before execution. Values can be any JSON-serialisable type.

Examples

Simple arithmetic

{
  "type": "code.run_node",
  "input": { "vars": {} },
  "params": { "source": "result = 1 + 1", "timeout_seconds": 5 }
}

Transform an array with input variables

{
  "type": "code.run_node",
  "input": { "vars": { "items": ["foo", "bar", "baz"] } },
  "params": { "source": "result = items.map(s => s.toUpperCase()).join(', ')", "timeout_seconds": 5 }
}

Pricing

Billed per second of sandbox execution time (rounded up to the nearest second). See pricing dashboard for current rates.

Related capabilities

• code.run_python — execute Python code in a sandbox
• web.search — retrieve live data to process with this capability

{
  "source": "result = 1 + 1",
  "timeout_seconds": 5
}