Node.JS學習筆記(10)_環境變數配置

npm install dotenv --save

在專案所在根目錄下產生.env檔案
用nano編輯器編寫以下環境變數

HOST=localhost

PORT=3000

const http = require('http');

require('dotenv').config();

// Read the host address and the port from the environment

const hostname = process.env.HOST;

const port = process.env.PORT;

// Return JSON regardless of HTTP method or route our web app is reached by

const server = http.createServer((req, res) => {

    res.statusCode = 200;

    res.setHeader('Content-Type', 'application/json');

    res.end(`{"message": "Hello World"}`);

});

// Start a TCP server listening for connections on the given port and host

server.listen(port, hostname, () => {

    console.log(`Server running at http://${hostname}:${port}/`);

});