BACKEND_getting_started_cheat_sheet.md

backend_cheatsheet.md

Node.js

• npm i -g nodemon

Auto-generate a package.json (with default ‘yes’ to each of the standard questions) using:

• npm init --yes

Express JS

mkdir NAME_OF_DIRECTORY

• npm i express --save
• touch server.js
• touch app.js

CORS

• npm install cors Near the top of app.js include:
• const cors = require(‘cors’); Insert this config line into your app.js file:
• app.use(cors());

Code for Basic Server

In your app.js file enter this:

const express = require('express');
const app = express();
app.use(express.json());

app.get('/', (request, response) => {
  response.send('NAME OF APP');
});

export default app;

In your server.js file enter this:

import app from ‘./app’;

app.set('port', process.env.PORT || 3000);

app.listen(app.get('port'), () => {
  console.log(`${app.locals.title} is running on http://localhost:${app.get('port')}.`);
});

Incorporating babel

• npm install --save-dev @babel/core @babel/preset-env @babel/node Create a .babelrc file in the root of your directory
• touch .babelrc Inside that file add this:

// .babelrc
{
  "presets": ["@babel/preset-env"]
}

In your package.json file within your “scripts” object replace the “start” with this: "start": "nodemon --exec babel-node server.js"

Express with Knex

• npm i -g knex
• npm i knex --save
• npm i pg --save Create a knex file in your terminal using
• knex init Your ./knexfile.js should look something like this:

module.exports = {

  development: {
    client: 'pg',
    connection: 'postgres://localhost/<NAME OF DATABASE>
    migrations: {
      directory: './db/migrations'
    },
    seeds: {
      directory: './db/seeds/dev'
    },
    useNullAsDefault: true,
  },

  test: {
    client: 'pg',
    connection: 'postgres://localhost/<NAME OF DATABASE>
    migrations: {
      directory: './db/migrations'
    },
    seeds: {
      directory: './db/seeds/test'
    },
    useNullAsDefault: true,
  },

};

Server-Side Testing With A DB (Database)

• npm i jest -g We’ll need to set up our app.js and test file to have access to our database, regardless of whether we’re using the development DB or the test DB. Add the following to your own app.js, as well as app.test.js:

const environment = process.env.NODE_ENV || 'development'
const configuration = require('./knexfile')[environment]
const database = require('knex')(configuration)

Make sure Postgres is installed and running:

• Open your terminal Type in:
• psql
• CREATE DATABASE NAME_OF_DATABASE; (don’t forget the semicolons!)
• Check Postgres/Postico to make sure the database(s) are there.
• CD into your backend directory and in your terminal run:

Add npm install supertest