목표
백엔드로 koa프레임워크를, 데이터베이스를 mongoDB를 적용한 개발 환경 설정하기
1. 프로젝트 생성하기
(1) 패키지 정보 생성
npm init --y
(2) ESLint & Prettier 설정
npm i -D eslint eslint-config-prettier
// .eslintrc.js
module.exports = {
"env": {
"node": true,
"commonjs": true,
"es2021": true
},
"extends": ["eslint:recommended", "prettier"],
"parserOptions": {
"ecmaVersion": 12
},
"rules": {
"indent": [
"error",
2
],
"semi": [
2
],
"no-trailing-spaces": 0,
"keyword-spacing": 0,
"no-unused-vars": 1,
"no-multiple-empty-lines": 0,
"space-before-function-paren": 0,
"eol-last": 0
}
};
//.prettierrc
{
"singleQuote": true,
"semi": true,
"useTabs": false,
"tabWidth": 2,
"trailingComma": "all",
"printWidth": 80
}
(3) Koa 프레임워크 적용하기.
express 프레임워크와 대체적으로 비슷한 구조를 보임
req,res 대신에
ctx사용한다
npm i koa koa-router koa-bodyparser
src/index.js
require('dotenv').config();
const Koa = require('koa');
const Router = require('koa-router');
const app = new Koa();
const router = new Router();
const api = require('./api');
const bodyParser = require('koa-bodyparser');
const port = process.env.PORT || 4000;
app.use(bodyParser());
router.use('/api', api.routes());
app.use(router.routes()).use(router.allowedMethods());
app.listen(port, () => {
console.log('koa server is listening to port ' + port);
});
// api/index.js
const Router = require('koa-router');
const api = new Router();
api.get('/books', (ctx, next) => {
ctx.body = 'GET ' + ctx.request.path;
});
module.exports = api;
(4) MongoDB 서버 설치
-
brew가 이미 설치 되어있어야함.
brew tap mongodb/brew
brew install mongodb-community@4.2
sudo mkdir -p /Users/[username]/data/db
(5) Mongoose 설치 및 적용
-
Mongoose 는 MongoDB 기반 ODM (Object Data Modelling) 라이브러리이며, 스키마형태로 데이터를 관리할 수 있게 도와주는 역할
npm i dotenv mongoose
//.env.sample
PORT =
SOCKET_PORT =
DB_ID =
DB_PW =
DB_HOST =
DB_DATABASE =
// init/dbconnect.ts
import mongoose from 'mongoose';
const { DB_ID, DB_PW, DB_HOST, DB_DATABASE } = process.env;
const MONGO_URI = `mongodb://${DB_ID}:${DB_PW}@${DB_HOST}/${DB_DATABASE}`;
const connectDB = () => {
// mongodb 연결
return mongoose
.connect(MONGO_URI, {
useCreateIndex: true,
useUnifiedTopology: true,
useNewUrlParser: true,
useFindAndModify: false,
})
.then(() => {
console.log('Successfully connected to mongodb');
})
.catch((e) => {
console.error(e);
});
};
export default connectDB;
