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Node express dotenv與環境變數設定

node 使用版本號16.14.0

安裝dotenv與環境變數設定

dotenv
建立 .env 檔 (不要加入 git)

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npm install dotenv --save

.env 檔，全大寫

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DB_USER=user
DB_PASS=xxxxxxx
DB_HOST=xxxxxxxx.xxxxxxx.mongodb.net
MONGO_PROJECT=xxxxxxx
MONGO_RETRY_WRITES=true

環境變數：在程式剛啟動時，就可以載入require(‘dotenv’).config();

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//express
const express = require('express')
//資料庫
const mongoose = require('mongoose')
//環境變數
require('dotenv').config()
//資料庫連結
const user = process.env.DB_USER;
const password = process.env.DB_PASS;
const host = process.env.DB_HOST;
const project = process.env.MONGO_PROJECT;
const retryWrites = process.env.MONGO_RETRY_WRITES;
const connectionString = `mongodb+srv://${user}:${password}@${host}/${project}?retryWrites=${retryWrites}&w=majority`;

mongoose.set("strictQuery", false)

mongoose.connect(connectionString,{serverSelectionTimeoutMS: 5000})
  .then(() => {
    console.log('連結mongoose');
  })
  .catch((err) => {
    console.log(err.message);
  });

const app = express()

app.use(express.json())
// express 網址編碼 中內置的一種方法，用於將傳入的 Request Object 識別為strings 或 arrays; extended=>廣大的。

app.use(express.urlencoded({ extended: false }))


const api = require('./routes/api')
app.use('/api', api)

const auth = require('./routes/auth')
app.use('/auth', auth)


app.get('/', (req, res) => {
  res.send('Hello Node Api!')
})

const PORT = process.env.PORT || 8080;


app.listen(PORT, () => console.log(`服務器正在監聽端口 ${PORT}`));

module.exports = app;