n8n-nodes-doppelganger

Official n8n community node that lets you run Doppelganger tasks directly through your workflow using the local or remote Doppelganger API.

Highlights

• Single Execute Task operation that posts to POST /tasks/:id/api with optional variables.
• Credential-based authentication, so each workflow can point at a different Doppelganger server or API key.
• Task dropdown is populated dynamically by calling /api/tasks/list, keeping the node synchronized with what the server exposes.

Requirements

• n8n (cloud or self-hosted) with community nodes enabled.
• Doppelganger server reachable from wherever n8n is running (default http://localhost:11345).
• Valid API key created via Doppelganger Settings.

Documentation

• For a full walkthrough of the n8n integration, see the official Doppelganger docs: https://doppelgangerdev.com/docs/n8n-integration.

Installation

Classic (recommended)

1. In n8n, go to Settings -> Community Nodes.
2. Enter n8n-nodes-doppelganger.
3. Install the package and restart n8n if prompted.

Manual (from source)

npm install
npm run build

This compiles the TypeScript sources under src/ to dist/, copies the bundled assets, and makes the package usable as a community node.

Configuration

Credentials

The node uses the Doppelganger API credential type, which captures:

• Base URL - defaults to http://localhost:11345. Trim trailing slashes.
• API Key - stored securely and sent in the x-api-key header on every request.

When you connect the credential, the node can reach the /api/tasks/list endpoint to populate the Task dropdown.

Node fields

• Operation - currently only Execute Task.
• Task - choose a task ID from the loaded list; the list is sorted by name and falls back to the raw ID when no name exists.
• Variables - optional fixed collection of key/value pairs that are sent in the request body under variables. Leave blank to trigger the task with its default inputs.

Usage

1. Add the Doppelganger node to your workflow and attach it to the steps that should trigger a task.
2. Select your Doppelganger API credential.
3. Pick the task to run from the dropdown; it calls /api/tasks/list automatically via the credential.
4. Optionally define Variables to override or inject runtime data, either by hardcoding strings or by using expressions that reference previous nodes.

Each execution performs:

POST {baseUrl}/tasks/:taskId/api
Headers:
  x-api-key: {api key}
Body:
  {
    "variables": {
      "<name>": "<value>",
      ...
    }
  }

The node returns the JSON response from Doppelganger as the output data for downstream nodes.

Troubleshooting

• Tasks list is empty - confirm the credential's Base URL/API key, ensure n8n can reach the Doppelganger server, and that /api/tasks/list returns a payload.
• Task run fails with HTTP error - review the Doppelganger logs for task-specific errors and confirm that the task ID exists.
• Variables are ignored - make sure each entry in the Variables collection has a non-empty Name; values can be empty strings but names are required.

Development

• npm run build compiles TypeScript sources and copies icons into dist/.
• After building, publish the package to npm (if desired) or load the folder as a local community node archive.

Contributing

1. Fork this repo, implement fixes or nodes in src/, and push a topic branch.
2. Run npm run build to regenerate dist/ before submitting a pull request.
3. Describe how to reproduce or test your changes in the PR description.

License

Apache License 2.0 - see LICENSE.