Pro Next js Tip: Detect Device, Browser & OS on Server Side Render using User Agent
Автор: Code Review
Загружено: 2025-05-25
Просмотров: 66
Want to know if your users are on mobile or desktop — before your page even hits the browser?
In this video, you’ll learn how to detect the user’s device type, browser, and operating system in Next.js using the User-Agent string, all from the server side — with zero delay or hydration flicker.
We’ll start by breaking down what the User-Agent is, how it’s formed, and why it’s sent with every HTTP request. You’ll learn how to extract it from both getServerSideProps and custom route handlers — including /app/api or /pages/api endpoints — and how to parse it cleanly for real-world use.
Why does this matter?
Because Tailwind handles styling, but sometimes your JavaScript logic — like click events or form submissions — needs to know exactly what kind of device the user is on. And in server-rendered apps like Next.js, relying on window.navigator alone leads to problems like undefined states or flickering layouts after hydration.
We’ll cover:
✅ What the User-Agent string is and how it’s structured
✅ How to detect mobile vs desktop using regex or parsers
✅ Using it inside getServerSideProps for first-render props
✅ Parsing User-Agent info in route handlers (API routes)
✅ Using device type in JavaScript logic, not just styling
✅ Avoiding common SSR pitfalls in Next.js apps
🎯 Whether you’re building responsive layouts, tailoring logic to mobile users, or optimizing performance — this is a must-know technique for serious Next.js developers.
🔗 Resources
📦 UAParser: ua-parser-js for advanced UA parsing
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Chapters:
00:00 Intro
01:53 What is User-Agent
03:09 Initial state problem definition
05:20 How to pass and parse User-Agent to client?
15:12 Testing the solution
15:35 How to retrieve & parse User-Agent in route handler?
16:16 Outro
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