Use https certificate on localhost with Express

.gitignore

node_modules/

README.md

Use https certificate on localhost with Express

Note: tested on Ubuntu

Install utilities

sudo apt install libnss3-tools
wget https://github.com/FiloSottile/mkcert/releases/download/v1.4.3/mkcert-v1.4.3-linux-amd64
chmod +x mkcert-v1.4.3-linux-amd64 
sudo mv mkcert-v1.4.3-linux-amd64 /usr/local/bin/mkcert

Create certificate for your app

# If you do not want to install certifictaes to your browsers
# mkcert -install localhost
# If you want to make trusted certificates to your browsers
# If you have a firefox master password, you should enter it
# when you see "Enter Password or Pin for "NSS Certificate DB""
mkcert -install localhost

Install an run the app

npm i
node app.js

Then, go to https://localhost:3001/

app.js

const express = require('express');
const https = require('https');
const fs = require('fs');

const key = fs.readFileSync('./localhost-key.pem');
const cert = fs.readFileSync('./localhost.pem');

const app = express();
const server = https.createServer({key: key, cert: cert }, app);

app.get('/', (req, res) => {
    res.send('this is an secure server');
});

server.listen(3001, () => {
  console.log('listening on 3001');
});

package.json

{
  "name": "my-secure-app",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "express": "^4.17.3"
  }
}