Programmatically use cloudflared Quick Tunnels

cloudflaredtunnels.js

// Original answer here https://community.cloudflare.com/t/quick-tunnel-from-nodejs/336868/3
const express = require('express');
const { spawn } = require('child_process');
let port = 8080;

// Express
let app = express();
app.get('/', (req, res) => res.send('Hi'));
app.listen(port);

// Cloudflared
const cloudflared = spawn('cloudflared', ['tunnel', '--url', `http://localhost:${port}`]);

cloudflared.stderr.on('data', (data) => {
  let output = data.toString().match(/https:\/\/.*\.trycloudflare\.com/)
	if (output) {
    console.log(`Tunnel up at: ${output[0]}`)
  }
});

cloudflared.on('close', (code) => {
	console.log(`cloudflared exited with code ${code}`);
});