Js Localization Laravel Package

Getting Started

Install the package and let Laravel discover it (5.5+); on older versions register the provider and the JS facade alias manually:

composer require andywer/js-localization
php artisan vendor:publish --provider="Andywer\JsLocalization\JsLocalizationServiceProvider"

Publishing gives you config/js-localization.php (where the generated file goes, typically public/js/localization.js) and a JS stub. First working use case — expose one translation group to the browser:

// app/Providers/AppServiceProvider.php  (boot)
use JS;

public function boot()
{
    JS::put(['messages' => 'messages']);
}

<script src="{{ asset('js/localization.js') }}"></script>
<script>
  console.log(Lang.get('messages.welcome'));
</script>

Look first at the published config for js_path, then verify the file exists at public/js/localization.js after a request and that the web server can write to that directory. That single file is the whole integration surface — everything else is Laravel translations plus a JS Lang helper.

Implementation Patterns

• Export in one place. Put JS::put([...]) in a service provider or a tiny middleware rather than scattered across controllers. Calling it on every request keeps the file current, but pair it with an environment guard (e.g., only in local/staging) if you don't want runtime writes in production.
• Export deliberately, not everything. JS::put() with only the groups the frontend actually renders keeps localization.js small. If your version supports a bulk method (putAll() / passing bare group names), use it only for small apps; otherwise list groups explicitly.
• Consume with Lang.get and Lang.choice. Lang.get('messages.welcome') for strings and Lang.choice('messages.apples', count) for pluralization mirror Laravel's trans()/trans_choice() closely enough for UI copy, but test placeholder and plural syntax rather than assuming parity.
• Prefer data over server-rendered JS. Keep the exported file as the single source of strings and read Lang.get() in your bundle/Blade, instead of mixing @lang() and Lang.get() for the same key — drift is otherwise inevitable.
• Cache-bust the asset. Browsers and CDNs happily serve yesterday's localization.js. Append a version query (?v={{ filemtime(public_path('js/localization.js')) }}), run it through Mix/Vite, or generate at deploy time.
• Deploy-time generation. For immutable/read-only environments, call the same export logic from a custom artisan command (php artisan app:export-lang) during deploy instead of writing on boot. The package writes a file; treat it as a build artifact when you can.
• SPA alternative. If file-writing is awkward, wrap the same translation lookup in a route/controller returning JSON and have the frontend hydrate Lang from it. The package's value is then mainly the Lang helper contract.

Gotchas and Tips

• Runtime writes need a writable public/. Heroku, read-only Docker images, Lambda and similar environments will fail or silently no-op. Ensure public/js is writable in dev and switch to deploy-time generation in production.
• It's a global, single-locale file. Generation captures whichever locale is active when JS::put() runs. Apps that switch locale per user/session need either per-locale output files or to regenerate on each request with the correct locale applied first.
• Overwrite races. Concurrent requests rewriting the same file can produce partial content or last-writer-wins behavior for different group sets. Stick to a stable superset of groups, and avoid varying exports per page.
• Only flat string groups survive. Nested arrays and complex trans() structures won't round-trip cleanly. Validate plural ranges and :placeholder replacement against Laravel instead of trusting them blindly.
• Lang undefined? Almost always a missing <script> include, an empty generated file, or JS::put() never being called. Check public/js/localization.js directly before debugging the JS.
• Facade alias still matters. Auto-discovery registers the provider, but code calling JS:: needs the alias (or a fully-qualified import) on older Laravel versions.
• Republishing overwrites customizations. If you customize the published JS stub, keep it under version control and re-apply after vendor:publish.
• Mind what you export. Validation messages and internal error strings end up in a public static file; don't export groups containing sensitive operational detail.
• Maturity signal. With 143 stars and no dependents, treat this as aging glue code: pin the version, and be ready to replace it with a small JSON endpoint plus a ~30-line Lang helper if you need multi-locale output, caching headers, or modern build integration.