userAgent

The userAgent helper extends the Web Request API with additional properties and methods to interact with the user agent object from the request.

import { NextRequest, NextResponse, userAgent } from 'next/server'
 
export function middleware(request: NextRequest) {
  const url = request.nextUrl
  const { device } = userAgent(request)
  const viewport = device.type === 'mobile' ? 'mobile' : 'desktop'
  url.searchParams.set('viewport', viewport)
  return NextResponse.rewrite(url)
}

isBot

A boolean indicating whether the request comes from a known bot.

browser

An object containing information about the browser used in the request.

• name: A string representing the browser's name, or undefined if not identifiable.
• version: A string representing the browser's version, or undefined.

device

An object containing information about the device used in the request.

• model: A string representing the model of the device, or undefined.
• type: A string representing the type of the device, such as console, mobile, tablet, smarttv, wearable, embedded, or undefined.
• vendor: A string representing the vendor of the device, or undefined.

engine

An object containing information about the browser's engine.

• name: A string representing the engine's name. Possible values include: Amaya, Blink, EdgeHTML, Flow, Gecko, Goanna, iCab, KHTML, Links, Lynx, NetFront, NetSurf, Presto, Tasman, Trident, w3m, WebKit or undefined.
• version: A string representing the engine's version, or undefined.

os

An object containing information about the operating system.

• name: A string representing the name of the OS, or undefined.
• version: A string representing the version of the OS, or undefined.

cpu

An object containing information about the CPU architecture.

• architecture: A string representing the architecture of the CPU. Possible values include: 68k, amd64, arm, arm64, armhf, avr, ia32, ia64, irix, irix64, mips, mips64, pa-risc, ppc, sparc, sparc64 or undefined