Skip to content

How to generate a local SSL certificate

New Course Coming Soon:

Get Really Good at Git

Note: I ran these commands on macOS. Linux should work in the same way. I don’t guarantee for Windows.

In the project root folder, run:

openssl req -x509 -newkey rsa:2048 -keyout keytmp.pem -out cert.pem -days 365

Now run:

openssl rsa -in keytmp.pem -out key.pem

You should now have the files cert.pem and key.pem in the folder.

With Express/Node.js, you can load the certificate and key using this code:

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

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

  key: fs.readFileSync('key.pem'),
  cert: fs.readFileSync('cert.pem')
}, app).listen(3000, () => {

If you’re using create-react-app, change the start script in the package.json file to:

"start": "export HTTPS=true&&SSL_CRT_FILE=cert.pem&&SSL_KEY_FILE=key.pem react-scripts start",

Look at your framework/library documentation on the instructions on how to pass the certificate and key to the app.

Are you intimidated by Git? Can’t figure out merge vs rebase? Are you afraid of screwing up something any time you have to do something in Git? Do you rely on ChatGPT or random people’s answer on StackOverflow to fix your problems? Your coworkers are tired of explaining Git to you all the time? Git is something we all need to use, but few of us really master it. I created this course to improve your Git (and GitHub) knowledge at a radical level. A course that helps you feel less frustrated with Git. Launching May 21, 2024. Join the waiting list!

Here is how can I help you: