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astro-toolbar-ua

v0.1.2

Published

Astro dev toolbar app for switching user agent strings — test platform detection and browser-specific behavior without leaving the browser.

Vulnerabilities

Powered byPowered by Snyk
  • 0High
  • 0Medium
  • 0Low

Links

Git

Maintainers

guillevcguillevc

Keywords

astro-integrationwithastroastrodev-toolbartoolbaruser-agentuabrowser-testing

Readme

astro-toolbar-ua

npm version license

Switch user agent strings from the Astro dev toolbar. Test platform detection and browser-specific behavior without leaving your browser.

astro-toolbar-ua panel showing preset UA options for Desktop, Mobile, and Browsers

Install

npx astro add astro-toolbar-ua
pnpm astro add astro-toolbar-ua
yarn astro add astro-toolbar-ua

Or install manually:

npm install -D astro-toolbar-ua
// astro.config.mjs
import { defineConfig } from "astro/config";
import toolbarUA from "astro-toolbar-ua";

export default defineConfig({
  integrations: [toolbarUA()],
});

Usage

Open the UA Switch panel in the Astro dev toolbar. Pick a preset or paste a custom UA string. The page reloads with the new user agent applied.

A notification dot appears on the toolbar icon when a UA override is active.

Presets

| Category | Presets | | ------------ | --------------------- | | Desktop | macOS, Windows, Linux | | Mobile | iOS, Android | | Browsers | Safari, Firefox, Edge |

You can also enter any custom UA string directly.

How it works

  1. A synchronous <head> script reads a localStorage key and overrides navigator.userAgent via Object.defineProperty — before any page scripts run
  2. The toolbar UI writes the selected UA string to localStorage and reloads the page
  3. Only runs during astro dev — production builds are not affected

Limitations

  • Only overrides client-side navigator.userAgent. Does not modify server-side request headers.
  • Object.defineProperty on navigator.userAgent works in Chromium and Firefox. Safari may not support it in all versions.

License

MIT