npm install dotenv
.env
HIDE = 123456789
.gitignore
.env
const express = require('express');
const app = express();
require('dotenv').config();
const Hide = process.env.HIDE;
app.get('/',(req,res)=>{
res.send('hello!')
})
app.listen(3000, ()=> {
console.log(`server listen ... ${Hide}`)
})
console.log 결과값은
server listen ... 123456789