If you’re building a website or web app that needs to detect users connecting through a VPN—whether... Tagged with webdev, javascript, tutorial, programming.

Dev.to is a community platform for developers, offering resources, discussions, and networking opportunities to empower individuals in their coding journey. Developers can learn new programming languages, frameworks, and tools, engage in discussions on best practices, and share their experiences with fellow developers to enhance their skills and grow their professional network.

Learn how to detect VPN users on your website or web app using the IPLocate API. The post provides examples for both client-side detection using Javascript and server-side detection with Express.js. It details fetching IP data and checking specific fields such as 'is_vpn' to determine if a user is connected through a VPN. Additional filtering options like 'is_proxy' and 'is_tor' are also discussed.

How to detect VPN users on your website/app

Example: Detect VPN client-side with Javascript

Example: Detect VPN server-side with Express.js

Is there a use-case for this that isn’t nefarious?

Great. Now, I will make a program that stops my whole app from working on-purpose unless they turn it off.

Need information about how iplocate identify such detail any detailed information ?

it works out only if the user is using well known VPN servers
if he is using a private server it could be bypassed.

So is there any no built-in JavaScript library to do that?