undeviceKnow the device. Bring your own flags.

Device, OS, and browser detection from headers. Dependency-free, typed, and ready for CDN signals.

Get started

Try it live

GitHub

Any runtime

Node.js, browser, or edge. You supply the input; undevice returns the flags.

Your checks

Callbacks, substring arrays, and exclusions. Custom flags with inferred types.

CDN-aware

Cloudflare and CloudFront hints with explicit precedence over User-Agent.

One detector

Configure once. Get a fresh immutable result for every request.

import { isbot
 } from "isbot";
import { undevice
 } from "undevice";

const { detect
 } = undevice
({
  isCrawler
: isbot
,
  isRawClient
: ["curl", "wget"],
});
const device
 = detect
({ userAgent
: navigator
.userAgent
 });

device
.isMobile
;
device
.isDesktop
;
device
.isWindows
;
device
.isChrome
;
device
.isCrawler
;
device
.isRawClient
;