The Wolfram Language nodejs server allows you to use the Wolfram Language in a webbrowser by making a web socket connection to a remote machine.
Generate a key and a self-signed certificate (this is needed to make a secure web socket connection):
openssl genrsa 1024 > key.pem
openssl req -x509 -new -key key.pem > cert.pem
The key.pem and cert.pem files need to be in the same directory as the websocket-server.js file.
Start the server:
node websocket-server.js
Open a web browser and open this page:
https://[yourmachinename]:7777/websocket-client.html