02 Express

Express

Add Express, Cors and Dotenv

yarn add express cors dotenv
yarn add @types/express @types/cors

Create .env.example and .env

code ./.env.example

PORT=4000

cp ./.env.example ./.env

Create routes for articles

mkdir ./src/routes
code ./src/routes/articles.ts

import { Router } from 'express';
import { articlesController } from '../controllers/articles';

export const articlesRoutes = (router: Router) => {
  const { findAll, findOne, create, update, remove } = articlesController();

  router.get('/articles', findAll);
  router.get('/articles/:id', findOne);
  router.post('/articles', create);
  router.put('/articles/:id', update);
  router.delete('/articles/:id', remove);

  return router;
};

Create generic controller

mkdir ./src/controllers
code ./src/controllers/records.ts

import { Request, Response } from 'express';

export const recordsController = () => {
  const findAll = async (req: Request, res: Response) => {
    // return all records
    res.send('all records will be returned');
  };

  const findOne = async (req: Request, res: Response) => {
    // return one record by id
  };

  const create = async (req: Request, res: Response) => {
    // create a new record
  };

  const update = async (req: Request, res: Response) => {
    // update a record by a given id
  };

  const remove = async (req: Request, res: Response) => {
    // delete a record by a given id
  };

  return { findAll, findOne, create, update, remove };
};

Create controler for Articles

code ./src/controllers/articles.ts

import { recordsController } from './records';

export const articlesController = () => {
  return recordsController();
}

Initialize Express

code ./src/app.ts

import express from 'express';
import cors from 'cors';
import { articlesRoutes } from './routes/articles';

export const app = async (port: number) => {

  // create and setup express app
  const app = express();
  app.use(express.json());
  app.use(cors());
  app.set('trust proxy', 1); // required for Heroku

  const router = express.Router();
  app.use(articlesRoutes(router));

  // start express server
  app.listen(port);
};

Application root file

code ./src/index.ts

import { config as configDotenv } from 'dotenv';
import { app } from './app';

configDotenv();

const port = parseInt(process.env.PORT);

const run = async () => {
  await app(port);
};

run();

Validate Express

yarn dev

curl http://localhost:4000/articles
# all records will be returned

Commit

git add .
git commit -m "Express"

Next step: TypeORM