n8nio/runners image includes JavaScript runner, Python runner and Task runner launcher that connects to a Task Broker running on the main n8n instance when running in external mode. This image is to be launched as a sidecar container to the main n8n container.

Task runners are used to execute user-provided code in the Code Node, isolated from the n8n instance.

Testing locally

1) Make a production build of n8n

pnpm run build:n8n

2) Build the task runners image

docker buildx build \
  -f docker/images/runners/Dockerfile \
  -t n8nio/runners \
  .

3) Start n8n on your host machine with Task Broker enabled

N8N_RUNNERS_ENABLED=true \
N8N_RUNNERS_MODE=external \
N8N_RUNNERS_AUTH_TOKEN=test \
N8N_LOG_LEVEL=debug \
pnpm start

4) Start the task runner container

docker run --rm -it \
-e N8N_RUNNERS_AUTH_TOKEN=test \
-e N8N_RUNNERS_LAUNCHER_LOG_LEVEL=debug \
-e N8N_RUNNERS_TASK_BROKER_URI=http://host.docker.internal:5679 \
-p 5680:5680 \
n8nio/runners

Adding extra dependencies (custom image)

To make additional packages available on the Code node you can bake extra packages into your custom runners image at build time.

JavaScript — edit docker/images/runners/package.json (package.json manifest used to install runtime-only deps into the JS runner)
Python (Native) — edit docker/images/runners/extras.txt (requirements.txt-style list installed into the Python runner venv)

Important: for security, any external libraries must be explicitly allowed for Code node use. Update n8n-task-runners.json to allowlist what you add.

1) JavaScript packages

Edit the runtime extras manifest docker/images/runners/package.json:

{
  "name": "task-runner-runtime-extras",
  "description": "Runtime-only deps for the JS task-runner image, installed at image build.",
  "private": true,
  "dependencies": {
    "moment": "2.30.1"
  }
}

Add any packages you want under "dependencies" (pin them for reproducibility), e.g.:

"dependencies": {
  "moment": "2.30.1",
  "uuid": "9.0.0"
}

2) Python packages

Edit the requirements file docker/images/runners/extras.txt:

# Runtime-only extras for the Python task runner (installed at image build)
numpy==2.3.2
# add more, one per line, e.g.:
# pandas==2.2.2

Tip: pin versions (e.g., ==2.3.2) for deterministic builds.

3) Allowlist packages for the Code node

Open docker/images/runners/n8n-task-runners.json and add your packages to the env overrides:

{
  "task-runners": [
    {
      "runner-type": "javascript",
      "env-overrides": {
        "NODE_FUNCTION_ALLOW_BUILTIN": "crypto",
        "NODE_FUNCTION_ALLOW_EXTERNAL": "moment,uuid",   // <-- add JS packages here
      }
    },
    {
      "runner-type": "python",
      "env-overrides": {
        "PYTHONPATH": "/opt/runners/task-runner-python",
        "N8N_RUNNERS_STDLIB_ALLOW": "json",
        "N8N_RUNNERS_EXTERNAL_ALLOW": "numpy,pandas"     // <-- add Python packages here
      }
    }
  ]
}

NODE_FUNCTION_ALLOW_BUILTIN — comma-separated list of allowed node builtin modules.
NODE_FUNCTION_ALLOW_EXTERNAL — comma-separated list of allowed JS packages.
N8N_RUNNERS_STDLIB_ALLOW — comma-separated list of allowed Python standard library packages.
N8N_RUNNERS_EXTERNAL_ALLOW — comma-separated list of allowed Python packages.

4) Build your custom image

From the repo root:

docker buildx build \
  -f docker/images/runners/Dockerfile \
  -t n8nio/runners:custom \
  .

5) Run it

Same as before, but use your custom image's tag:

docker run --rm -it \
  -e N8N_RUNNERS_AUTH_TOKEN=test \
  -e N8N_RUNNERS_LAUNCHER_LOG_LEVEL=debug \
  -e N8N_RUNNERS_TASK_BROKER_URI=http://host.docker.internal:5679 \
  -p 5680:5680 \
  n8nio/runners:custom

README.md

n8n - Task runners (n8nio/runners) - (PREVIEW)