Node ES6 REST Template

The purpose of this template is to kick-start your Node.js projects using ES6. It implements best practices in developing RESTful APIs and Domain-Driven Design. Features include:

Use of the Hexagonal Architecture to arrange the application into logical layers, with well-defined responsibilities.
Use of BDD and Specification-by-Example techniques for documenting application features. Yadda is used for automated testing.
RESTful APIs are implemented using the Express framework.
Persistence is implemented using an in-memory repository layer. This can be substituted with any persistence technology of your choice.
Logging and error handling are implemented using Bunyan.

Requirements

Install Node
- on OSX, install home brew and type brew install node
- on Windows, use the installer available at nodejs.org
Clone this repo
Open a terminal (command line) window
Type npm install -g node-inspector node-gyp gulp bunyan
- node-gyp is required for npm install to succeed
- bunyan is required for displaying the application log in a human readable format

Getting started (Dev Mode)

First make a copy of the sample environment file .env-sample to .env. Make any environment changes only in this copy. The .env file may vary for different environments (development, test, prod etc.) and should not be checked in to the repository.

To run the application in development mode:

$ npm install
$ npm run watch

npm install will install the required node libraries under node_modules. This needs to be run only once.
npm run watch will start the application. It is designed for an efficient development process. As you make changes to the code, the application will restart to reflect the changes immediately. Also, Node.js is started with the --inspect flag so that debugging is turned on.

To verify that the application is working correctly, point your browser to http://localhost:8080/v1/accounts - you should see a response with a list of accounts in JSON format. Since the persistence layer is in memory, the list will be empty.

Running Lint

To run ESLint on the src folder:

$ npm run lint

To run ESLint on the test folder:

$ npm run lint:test

Testing the application

Make sure the server is running.
In another shell, run acceptance tests using the following command

$ npm test

Building for production

When you want to deploy the application into production, run the following command:

$ npm run build
$ npm start

npm run build compiles the ES6 code into the dist directory. This needs to be run only once.
npm start runs the application from the dist directory.

You can also substitute the following command instead of npm start to avoid a dependency on npm:

node dist/index.js | bunyan -o short

Folder Structure

Highest Level Structure

/node_modules
/src
/dist
/test

node_modules: Node.js modules downloaded by npm install (do not check in)
src: contains all the ES6 source files for the RESTful server
dist: contains the compiled version ready for distribution (do not check in)
test: server tests

Source Folder Structure

/src
    /adapters
    /app
    /core

The server folder contains sub-folders that arrange the application into logical layers as suggested by the Hexagonal Architecture (a.k.a. the Onion Architecture):

The adapter layer adapts interactions from the external world to the application layer. This layer contains REST adapters as well as database repositories that allow the application layer to interact with the external world. Note that we are using in-memory persistence in the repositories. These can be easily modified to persist to a relational or NoSQL database.
The application layer coordinates high-level activities such as creation of the domain objects and asking them to perform tasks requested by the external world.
The core layer contains common application facilities such as logging and database initialization.

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