n8n-nodes-typesafe-jev

An n8n community node for TypeSafe Jev, the TypeSafe System One model for fast, structured decisions.

Jev returns typed decisions rather than generated prose. In a single node execution you can ask several independent questions about the same state and get back calibrated probabilities for classification, routing, verification and scoring.

Unofficial and community-maintained. Not affiliated with, endorsed by, or supported by TypeSafe.

Installation

In n8n, go to Settings → Community Nodes, select Install, and enter:

n8n-nodes-typesafe-jev

Credentials

Create an API key in the TypeSafe console, then add a TypeSafe API credential in n8n and paste the key. Press Test to confirm it works. The credential is checked against the model list endpoint.

Field	Required	Notes
API Key	yes	Stored encrypted by n8n and never written to output data
Base URL	no	Defaults to https://api.typesafe.ai. Change only for a proxy or dedicated deployment.

Node configuration

1. Pick a Model, or leave the default. The dropdown is loaded from your account.
2. Supply State as plain text, a JSON object or a JSON array. Defaults to the whole incoming item ({{ $json }}).
3. Choose Question Builder to define questions field by field, or JSON to supply a schema generated upstream.
4. Give every question a Name. That name is the key its answer appears under.

Question types

Type	You provide	Jev returns
Choice	Two or more labelled options, each with an optional description	choice, confidence, and a probability per label
Yes/No	Optional descriptions of what counts as yes and no	noul, the probability of yes
Score	An ordered rubric of two or more levels, lowest first	expected score, confidence, legend, and probabilities per level

Output

Option	Result
Append to Item (default)	Incoming fields, plus the full response under typesafeJev
Response Only	The full response: model, answers, usage
Answers Only	Just answers

Enable Simplify to reduce each answer to the single value you would branch on: the chosen label, the yes probability, or the expected score. With Answers Only and Simplify together, an item comes out as { "intent": "refund", "urgent": 0.82, "frustration": 1.4 }, ready for a Switch or Filter node.

Under Options you can set the request timeout, rename the output field, and include the TypeSafe request ID for support tickets.

Using it as an AI Agent tool

The node sets usableAsTool, so it can be attached directly to an AI Agent. The agent supplies the state, and Jev answers with a typed decision rather than free text.

JSON mode example

{
  "intent": {
    "type": "choice",
    "instructions": "What is the customer's primary request?",
    "criteria": {
      "refund": "The customer requests money returned.",
      "technical_help": "The customer needs a product or integration fixed.",
      "information": "The customer asks a question or seeks information."
    }
  },
  "urgent": {
    "type": "noul",
    "instructions": "Does the customer explicitly convey time pressure?",
    "criteria": {
      "true": "They ask for immediate, urgent, or time-bound action.",
      "false": "They do not convey time pressure."
    }
  },
  "frustration": {
    "type": "score",
    "instructions": "How frustrated is the customer?",
    "criteria": [
      "Calm or neutral",
      "Concerned but civil",
      "Very angry or strongly negative"
    ]
  }
}

Error handling

The question schema is validated before any request is made. Names must be unique, choices need at least two labels, scores need at least two rubric levels. Schema problems are reported as configuration errors; API failures are reported separately with the HTTP status, the server's message and the TypeSafe request ID.

Turn on Continue On Fail if the workflow should carry on and receive an item with an error field instead. n8n's built-in Retry On Fail handles transient failures.

Compatibility

Requires Node.js 20.15 or newer. The package has no runtime dependencies and declares n8n-workflow as a peer dependency, as n8n's verification guidelines require.

Development

pnpm install
pnpm run lint
pnpm run test
pnpm run build

pnpm run dev starts a local n8n with the node linked. pnpm run release bumps the version, tags and pushes, which triggers the publish workflow. Releases go out from GitHub Actions with npm provenance, never from a local machine.

To check the live API against every assumption this node makes:

TYPESAFE_API_KEY=sk-your-key node scripts/verify-api.mjs

See VERIFICATION.md for the full first-run checklist and examples/ticket-triage.workflow.json for an importable workflow that exercises both input modes.

While running pnpm run dev, n8n loads the node from disk and registers it as CUSTOM.typeSafeJev rather than n8n-nodes-typesafe-jev.typeSafeJev. Import examples/ticket-triage.dev.workflow.json in that mode, regenerated with node scripts/dev-workflow.mjs, otherwise n8n reports Unrecognized node type. Settings, Community Nodes, Install does not apply to a local dev node either; it installs from npm.

Do not run pnpm run lint --fix over nodes/TypeSafeJev/properties.ts. Its fixer reorders fixed-collection entries by rebuilding them, and silently drops displayOptions and typeOptions in the process, which flattens the per-type question form.

License

MIT