These examples live on my glitch.com account as well. They can all be found using the formula:
https://tigoe.example-name.me
or
https://glitch.com/~example-name
tigoe-express-basics shows some express.js basics.
tigoe-request-headers shows how to read client request headers in express.js.
tigoe-http-requests an app for testing different kinds of HTTP requests.
tigoe-mqtt-client shows how to make an mqtt client in node.js and in client-side JavaScript.
tigoe-websocket-server shows how to make a WebSocket server in node.js and client in client-side JavaScript.
tigoe-node-fetch-client This is both a server and a client. It shows how to make requests to a RESTful API using fetch(), simplify the result, and serve it via HTTP. It assumes you're using a microcontroller-based client or have some other reason for needing the results of an API to be simplified.