n8n-nodes-builder

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n8n-nodes-builder

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Quick and easy way to get into n8n nodes development.

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# n8n-nodes-builder

## Introduction

This repository aims to provide a simple way to get into developing nodes for n8n.

I am making it because the documentation on building custom nodes is
currently [outdated](https://github.com/n8n-io/n8n-nodes-starter/issues/62), and left
many [wondering how to get started](https://community.n8n.io/t/n8n-nodes-starter-example-switched-to-pnpm-does-not-match-tutorial/59031).

It is outdated because :

- It uses `npm` whereas `pnpm` is [now](https://github.com/n8n-io/n8n/pull/4429) the recommended package manager for
  n8n.
- It uses `npm link` to link nodes but making it work with `pnpm`
  is [undocumented](https://community.n8n.io/t/issues-creating-custom-nodes/81250/4) and people seems to
  rather [use docker](https://community.n8n.io/t/need-help-with-testing-custom-node-in-dev-container/57520/5) to make it
  work flawlessly.

Let's add that n8n itself is [using devcontainers](https://github.com/n8n-io/n8n/tree/master/.devcontainer) to help
maintainers make contributions easier, so why not use it to develop custom nodes as well?

And this is exactly what this repository is all about.

## Overview

```text
.
├── .devcontainers/
│   ├── .env.example                        # Environment variables template file
│   ├── Dockerfile                          # Dev container Dockerfile
│   ├── devcontainer.json                   # Dev container configuration
│   ├── docker-compose.devcontainer.yaml    # Devcontainer specific docker-compose
│   ├── docker-compose.yaml                 # Main docker-compose configuration
│   ├── init.sh                             # Init script to clone repos
│   └── link_custom_nodes.sh                # Script to link custom nodes to n8n 
├── .vscode/
│   └── launch.json                         # VSCode launch configuration
├── custom-nodes/
│   ├── custom-node-1/
│   │   ├── dist/                           # Custom node 1 build folder
│   │   └── ...
│   └── custom-node-2/
│       ├── dist/                           # Custom node 2 build folder
│       └── ...
├── n8n/                                    # n8n source code             
│   └── ...
├── .gitignore
├── LICENSE
└── README.md
```

## How to use

1. Clone this repository and navigate to the root folder.
2. **[Optional (done during the dev container creation process)]** Clone
   the [n8n repository](https://github.com/n8n-io/n8n) at the workspace root and
   the [n8n-nodes-starter repository](https://github.com/n8n-io/n8n-nodes-starter) in the `custom-nodes` folder. You
   could also execute the `.devcontainer/init.sh` script to do it for you.
3. Create a `.env` file in the `.devcontainers` folder. You can use `.env.example` as a template.
    - Used for
      docker-compose [variable interpolation](https://docs.docker.com/compose/how-tos/environment-variables/variable-interpolation/#interpolation-syntax)
    - Used as [`.env` file for the n8n container](https://docs.docker.com/reference/compose-file/services/#env_file)
4. Use `F1` or `Ctrl+Shift+P` and select `Dev Containers: Reopen in Container` in VSCode. The first start it long (5m on
   my end) because it builds up n8n from source, but subsequent starts are a matter of seconds.
5. Go to your custom node folder and run `pnpm install` to install dependencies.
6. Still inside your custom node folder, run `pnpm build` to build your custom node.
7. **[Optional (done as preLaunchTask inside `launch.json`)]** You can also run `pnpm dev` in a terminal to watch for
   changes and rebuild automatically.
8. Then press `F5` to start the n8n server in debug mode using `Start n8n` launch config. It will run `pnpm dev` in the
   custom nodes folder and start the n8n server in debug mode.
9. Add breakpoint to your custom node Typescript or n8n source code and start debugging !

## Inspirations

- [How to setup a dev environment for node building](https://community.n8n.io/t/how-to-setup-a-dev-environment-for-node-building/77150)
- [Need help with testing custom node in dev container](https://community.n8n.io/t/need-help-with-testing-custom-node-in-dev-container/57520)
- [Developing Custom Nodes for n8n with Docker](https://dev.to/hubschrauber/developing-custom-nodes-for-n8n-with-docker-3poj)

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