development.md

Development Guide

This is based on a starter kit with the following characteristics:

• Local Port Number: 3001
• Language: NodeJS (with NPM)
• App server: Express JS
• Authentication: PassportJS (http://www.passportjs.org/) - username + password with Cookies (no JWT)
• API framework: Roll our own REST API (no need for automated docs)
• Database: Postgres
• ORM: Sequelize (https://sequelize.org/)
• DB migration: https://sequelize.org/master/manual/migrations.html
• Testing:
  • Unit Tests: Jest (https://jestjs.io/)
• Linter: ESLint (https://eslint.org)

Steps in preparing this starter kit

1. We use the Express Generator to prepare the skeleton:

   npx express-generator --no-view --git

   Move the generated files into an src folder.

2. Add CORS middleware

   npm install --save cors

   Add these lines to 'app.js'

   const cors = require('cors')
   
   app.use(cors())

3. Prepare the JavaScript linter

   We installed ESLint with the StandardJS coding style.

   1. npx eslint --init

   2. Select "Use a popular style guide."

   3. Select "Standard."

   4. Select 'JSON' as the config file format.

   5. If prompted, confirm the installation of the necessary dependencies.

   Update package.json with the jslint and jsfmt scripts

   "scripts": {
     "jsfmt": "eslint \"src/**/*.js\" --fix",
     "jslint": "eslint \"src/**/*.js\""
   }

4. Add the Jest testing framework:

   npm install --save-dev jest eslint-plugin-jest

   Add the ESLint configurations into .eslintrc.js (refer to https://github.com/jest-community/eslint-plugin-jest#readme)

5. Add nodemon for dev server

   npm install --save-dev nodemon

   Update package.json accordingly to add a dev server.

   "scripts": {
     "start": "NODE_ENV=production node ./bin/www",
     "dev": "NODE_ENV=development PORT=3001 DEBUG=app:* nodemon --ignore '*.test.js' --watch src bin/www"
   }

6. Debugging

   Use Debug to add your debugging messages to the terminal.

   const debug = require('debug')('app:users')
   
   debug('Hello World!')

7. Add DotEnv for injecting environment variables through a .env file.

   npm install --save dotenv
   

   Copy the env.sample file to .env and update the variables in .env:

   cp env.sample .env
   

   You will then be able to view the env variables via process.env.VAR_NAME. As a convention, environment variables are all caps and underscore case.

8. Add other dependencies:

   npm install --save passport passport-local sequelize pg pg-hstore

Managing Postgres Database

We are using Postgres as the database for this app.

GUI tools

For MacOS

• Postgres.App - The easiest way to get started with PostgreSQL on the Mac
• Postico - A Modern PostgreSQL Client for the Mac

For Windows

• Postgres - Official installer for Postgres on Windows
• pgAdmin - pgAdmin is the most popular and feature rich Open Source administration and development platform for PostgreSQL

ORM

We are using Sequelize as our database ORM (Object Relational Mapping) library. You can use the CLI tool to run database migrations and to generate the models.

Create Databases

NODE_ENV=development ./node_modules/.bin/sequelize db:create
NODE_ENV=test ./node_modules/.bin/sequelize db:create

Migration

NODE_ENV=development ./node_modules/.bin/sequelize db:migrate
NODE_ENV=test ./node_modules/.bin/sequelize db:migrate

How we created the User model

./node_modules/.bin/sequelize model:generate --name User --attributes firstName:string,lastName:string,email:string,passwordHash:string

Seeding Database

./node_modules/.bin/sequelize db:seed:all

More info

Checkout the Sequelize v5 documentation for more info: https://sequelize.org/master/