Using `userAgent` in Next.js App Router — Device, Browser, OS & Bot Detection

📰 Dev.to · MO Slah

Learn to detect devices, browsers, and OS in Next.js using userAgent for server-side parsing and redirection

intermediate Published 3 Apr 2026

Action Steps

Install the `user-agent` package using npm or yarn
Import the `UserAgent` class in your Next.js page or component
Parse the `userAgent` string using the `UserAgent` class to extract device, browser, and OS information
Use the extracted information to implement server-side redirects or conditional rendering
Test and verify the functionality using different devices and browsers

Who Needs to Know This

Frontend developers and engineers working with Next.js can benefit from this technique to enhance user experience and security

Key Insight

💡 Use the `userAgent` package to simplify server-side user-agent parsing in Next.js

Key Takeaways

Learn to detect devices, browsers, and OS in Next.js using userAgent for server-side parsing and redirection

Server-side user-agent parsing without the manual string gymnastics. Ever needed to redirect...