Usage on the Server

In general you can use messages and the languageTag() function on the server without issues.

There are a few things to be aware of:

• Messages are just functions. Make sure they are called somewhere that's evaluated for every request.

Using the Language in Server Actions

Use the initializeLanguage function at the top of your server-action file to make sure the language is available.

// src/app/actions.ts
"use server"
import { initializeLanguage } from "@inlang/paraglide-next"
import { languageTag } from "@/paraglide/runtime"

initializeLanguage() //call it at the top of the file

export async function someAction() {
	languageTag() // "de"
}

export async function someOtherAction() {
	languageTag() // "de"
}

Chaining Middleware

Paraglide-Next comes with middleware. Often you will want to chain that middleware with your own.

Just call Paraglide-Next's middleware inside your own middleware function. Pass it the request and use the returned response.

// src/middleware.ts
import { middleware as paraglide } from "@/lib/i18n"
export function middleware(request: NextRequest) {
	//do something with the request
	const response = paraglide(request)
	// do something with the response
	return response
}

Using the language in Middleware

In some cases you may need to access the language of a request inside the middleware itself. For this the middleware function provides a detectLanguage function.

// src/middleware.ts
import { middleware as paraglideMiddleware } from "@/lib/i18n"
export function middleware(request: NextRequest) {
	const lang = paraglideMiddleware.detectLanguage(request)
	//do something with the language...
	// still use the paraglide middleware
	return paraglideMiddleware(request)
}