Servers

1. Add a vercel.json file

{
	"version": 2,
	"name": "YOUR_APP_NAME",
	"builds": [{
		"src": "./server.js",
		"use": "@vercel/node"
	}],
	"routes": [{
		"src": "/(.*)",
		"dest": "/server.js"
	}]
}

2. Export your application

// server.js
var express = require('express');
var app = express();
// routers
// middleware
// start server
// finally ...
module.exports = app;

3. Continue with this tutorial: Deploy Node.js application to Vercel

1. Create a new file for the secret information.

// secure.js
let key = 12345;

2. Import the file (before your other code!)

<!-- index.html -->
<script src="secure.js"></script>
<script>console.log(key)</script>  

3. Create a .gitignore file in the root of your project. Add the name of the secret file on a new line.

# .gitignore
passwords.js

4. Commit the .gitignore file and then git will not track the file containing your secret information.

*Your file will only run on your computer

1. Create a .env in the project root and add secure information

USER="admin"
PASS="123456"

2. Create a .gitignore file in your project root. Add the .env.

node_modules
.DS_Store
.env

3. Install dotenv

npm install dotenv

4. Import the dotenv module, which loads variables from .env file.

// import package
require('dotenv').config()
// vars are now available
console.log(process.env.USER)