Running multiple ngrok tunnels for free

1. ngrok config check - check where you config file is located.

2. If you haven't already, I suggest you claim you a free ngrok subdomain. You can do it in the ngrok dashboard. While it is not required to run multiple tunnels, it is a nice to have. Otherwise you will get random URLs for each tunnel.

3. Edit the config file and add the following lines:

tunnels:
  first:
    addr: 3000
    proto: http
    domain: your-subdomain.ngrok.io
  second:
    addr: 3001
    proto: http

4. Run ngrok start --all to start all tunnels or ngrok start first second to start specific tunnels.

Calling ngrok start first second will:

• Tunnel the first app from port 3000 to your-subdomain.ngrok.io.

• Tunnel the second app from port 3001 to a random ngrok URL.

And that's it 🎬.