n8n

n8n - Workflow Automation Tool

n8n is a free node based "Open Source" (with Commons Clause) Workflow Automation Tool. It can be self-hosted, easily extended, and so also used with internal tools.

Is still in beta so can not guarantee that everything works perfectly. Also is there currently not much documentation. That will hopefully change soon.

Demo

A short demo (< 3 min) which shows how to create a simple workflow which automatically sends a new Slack notification every time a Github repository received or lost a star:

https://www.youtube.com/watch?v=ePdcf0yaz1c

Give n8n a spin

To simply spin up n8n to have a look and give it spin you can simply run:

npx n8n

It will then download everything which is needed and start n8n.

You can then access n8n by opening: http://localhost:5678

Installation

To fully install n8n globally execute:

npm install n8n -g

Start

After the installation n8n can be started by simply typing in:

n8n
# or
n8n start

Start with tunnel

To be able to use webhooks which all triggers of external services like Github rely on n8n has to be reachable from the web. To make that easy n8n has a special tunnel service which redirects requests from our servers to your local n8n instance.

To use it simply start n8n with --tunnel

n8n start --tunnel

Start with MongoDB as Database

By default n8n uses SQLite to save credentials, past executions and workflows. To use MongoDB instead you can either overwrite the default configuration on startup like this:

n8n start \
  --NODE_CONFIG='{\"database\":{\"type\":\"mongodb\", \"mongodbConfig\":{\"url\":\"mongodb://MONGO_USER:MONGO_PASSWORD@MONGO_SERVER:MONGO_PORT/MONGO_DATABASE\"}}}'"

Or you can provide a custom configuration file by copying the default configuration file (config/defaults.ts). Make sure the file is also called default.ts and then set the path of the parent directory as environment variable NODE_CONFIG_DIR.

For example like this:

export NODE_CONFIG_DIR=/directory-containing-config-file

Change in the config file the value under database.type from sqlite to mongodb and adjust the Mongo connection URL database.mongodbConfig accordingly.

n8n will then read your custom configuration and use MongoDB instead.

Execute Workflow from CLI

Workflows can not just be started by triggers, webhooks or manually via the Editor it is also possible to execute them directly via the CLI.

Execute a saved workflow by its ID:

n8n execute --id <ID>

Execute a workflow from a workflow file:

n8n execute --file <WORKFLOW_FILE>

Create Custom Nodes

It is very easy to create own nodes for n8n. More information about that can be found in the documentation of "n8n-node-dev" which is a small CLI which helps with n8n-node-development.

To n8n-node-dev

License

Apache 2.0 with Commons Clause

Development

When developing n8n can be started with npm run start:dev. It will then automatically restart n8n every time a file changes.