When you're building a web app on your local machine, sometimes you need to share it with someone online — maybe a teammate, client, or even for testing on your mobile device. But localhost only works on your computer. That’s where tunneling tools come in! They create a secure public URL that maps to your local server. Below are three popular options: 1.

When you're building a web app on your local machine, sometimes you need to share it with someone online — maybe a teammate, client, or even for testing on your mobile device. But localhost only works on your computer.
That’s where tunneling tools come in! They create a secure public URL that maps to your local server. Below are three popular options: