action_run_js · action · Utility · Available · v1.0.0
Execute custom JavaScript in the in-process isolated-vm sandbox (the battle-tested V8 isolation used by Cloudflare Workers): no filesystem, no network, no modules — the escape hatch for any business-logic transformation the specific nodes do not cover.
Fields shown in the editor when configuring the node. Generated directly from the NodeDefconfigFields.
| Field | Type | Required | Default | Description |
|---|---|---|---|---|
codeCodice JavaScript | code | yes | // input = output del nodo precedente
// vars = workflow variables
// ctx = { tenantId, runId, nodeId }
const items = input.items || [];
const total = items.reduce((s, x) => s + (x.amount || 0), 0);
return { total, count: items.length };
| Codice JS. Usa "return <value>" per emettere output (JSON-serializable). Strict mode. No require/import/fetch/process/eval. Per data transformation pattern n8n-compat usa logic_transform (più ergonomico). |
timeoutMsTimeout (ms) | number | no | 5000 | Tempo massimo esecuzione. Min 100, max 30000. Default 5s. |
memoryLimitMbMemory limit (MB) | number | no | 128 | Limite memoria isolated-vm. Min 16, max 512. Default 128MB. |
JSON snippet of the node as it appears in the workflow. Values are derived fromdefaultValue and from required parameters.
{
"id": "node-action_run_js-1",
"defId": "action_run_js",
"label": "Run JavaScript",
"config": {
"code": "// input = output del nodo precedente\n// vars = workflow variables\n// ctx = { tenantId, runId, nodeId }\n\nconst items = input.items || [];\nconst total = items.reduce((s, x) => s + (x.amount || 0), 0);\nreturn { total, count: items.length };\n",
"timeoutMs": 5000,
"memoryLimitMb": 128
}
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