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+---
+title: "Typesafe Internationalization (i18n) in Next.js with next-intl"
+summary: "Comprehensive guide to internationalize your Next.js app with next-intl, typesafety for translation strings, split translations into multiple files and translate outside React components."
+type: Blog
+publishedAt: 2024-09-30
+draft: true
+---
+
+## Goals
+
+Before diving deep lets list down goal of this article:
+- Integrate next-intl in Next.js app (App router)
+- Use next-intl outside of React components
+- Split translations strings into multiple files
+- Introduce typesafety in translations
+- Use next-intl with server components
+
+## Pre-requisites
+
+Make sure you have bootstraped a Next.js app (v 13.x+) with Typescript.
+
+Also make sure you've installed `next-intl`:
+
+```bash
+npm install next-intl
+```
+
+
+## Setting up translation strings
+
+Before starting lets make sure that we have our locales ready. For this example we will use English (en) and Nepali (ne) locales.
+
+Create a folder named `messages` in the root of your project, crate two folders `en` and `ne` inside the `messages` folder.
+
+Normally, next-intl docs recommends you to create single file for each translations, but creating multiple files will help us to manage translations for different components and features.
+and the translations won't be too large in a single file.
+
+Inside each locale folder create a json file with the name of the locale.
+
+In our case we will create two files called `auth.json` and `users.json` inside the `en` and `es` folders.
+
+- `messages/en/auth.json`
+- `messages/en/users.json`
+- `messages/ne/auth.json`
+- `messages/ne/users.json`
+
+The sole purpose of these files is to store the translations for the auth and users modules.
+
+```json
+// messages/en/auth.json
+{
+ "auth": {
+ "login": "Login",
+ "register": "Register"
+ }
+}
+```
+
+```json
+// messages/en/users.json
+{
+ "users": {
+ "title": "Users",
+ "form" : {
+ "name": "Name",
+ "email": "Email"
+ }
+ }
+}
+```
+
+```json
+// messages/ne/auth.json
+{
+ "auth": {
+ "login": "लगइन गर्नुहोस्",
+ "register": "दर्ता गर्नुहोस्"
+ }
+}
+
+```
+
+```json
+// messages/ne/users.json
+{
+ "users": {
+ "title": "प्रयोगकर्ताहरू",
+ "form": {
+ "name": "नाम",
+ "email": "इमेल"
+ }
+ }
+}
+```
+
+
+> 🧠 Pro tip : Use [https://translate.i18next.com/](https://translate.i18next.com/) to translate your messages to different languages.
+
+
+## Configuring routing for next-intl
+
+I highly recommend you to checkout the default [guide provided by next-intl](https://next-intl-docs.vercel.app/docs/getting-started/app-router/with-i18n-routing) before proceeding further.
+
+Here's overall structure of the project:
+
+```bash
+├── messages
+│ ├── en
+│ │ ├── auth.json
+│ │ └── users.json
+│ ├── ne
+│ │ ├── auth.json
+│ │ └── users.json
+├── next.config.js
+├── global.d.ts
+└── src
+ ├── i18n
+ │ ├── routing.ts
+ │ ├── routing.ts
+ │ └── types.ts
+ ├── middleware.ts
+ └── app
+ └── [locale]
+ ├── components
+ │ └── LocaleSwitcher.tsx
+ ├── layout.tsx
+ └── page.tsx
+```
+
+
+Configure the plugin in your `next.config.js` file.
+
+```js
+// next.config.js
+const createNextIntlPlugin = require('next-intl/plugin');
+
+const withNextIntl = createNextIntlPlugin();
+
+/** @type {import('next').NextConfig} */
+const nextConfig = {};
+
+module.exports = withNextIntl(nextConfig);
+```
+
+
+#### Configuring routing
+
+create a folder called `i18n` inside `src` where we put all the configuration related to next-intl and export from there.
+
+First define the routing in `src/i18n/routing.ts` file.
+
+```ts
+import { createSharedPathnamesNavigation } from "next-intl/navigation";
+import { defineRouting } from "next-intl/routing";
+
+export const routing = defineRouting({
+ locales: ["en", "ne"],
+ defaultLocale: "en",
+ pathnames: {},
+});
+
+export type Pathnames = keyof typeof routing.pathnames;
+export type Locale = (typeof routing.locales)[number];
+
+export const { Link, permanentRedirect, redirect, usePathname, useRouter } =
+ createSharedPathnamesNavigation(routing);
+```
+
+The above sample is fairly simple and we have copied it from [docs itself](https://next-intl-docs.vercel.app/docs/getting-started/app-router/with-i18n-routing#i18n-routing).
+
+
+#### Middleware setup
+
+Setup middleware to redirect to the correct locale based on the user's preferences.
+
+```ts
+// middleware.ts
+import createMiddleware from "next-intl/middleware";
+import { routing } from "./i18n/routing";
+
+export default createMiddleware(routing);
+
+export const config = {
+ matcher: [
+ // Enable a redirect to a matching locale at the root
+ "/",
+
+ // Set a cookie to remember the previous locale for
+ // all requests that have a locale prefix
+ "/(ne|en)/:path*",
+
+ // Enable redirects that add missing locales
+ // (e.g. `/pathnames` -> `/en/pathnames`)
+ "/((?!_next|_vercel|.*\\..*).*)",
+ ],
+};
+
+```
+
+#### Setup Server components configuration
+Create request-scoped configuration object to provide messages and other options based on user locale's to Server components.
+
+```ts
+// src/i18n/request.ts (make sure path is same as next-intl reads this path by default)
+import { notFound } from "next/navigation";
+import { getRequestConfig } from "next-intl/server";
+import { routing } from "./routing";
+
+export default getRequestConfig(async ({ locale }) => {
+ // Validate that the incoming `locale` parameter is valid
+ if (!routing.locales.includes(locale as any)) notFound();
+
+ return {
+ messages: {
+ ...(await import(`../../messages/${locale}/users.json`)),
+ ...(await import(`../../messages/${locale}/auth.json`)),
+ },
+ };
+});
+
+```
+
+
+#### Layout and Pages setup
+
+Setup layout with provider to provide translations to the components.
+
+```tsx
+// src/app/[locale]/layout.tsx
+
+import {NextIntlClientProvider} from 'next-intl';
+import {getMessages} from 'next-intl/server';
+
+export default async function LocaleLayout({
+ children,
+ params: {locale}
+}: {
+ children: React.ReactNode;
+ params: {locale: string};
+}) {
+ // Providing all messages to the client
+ // side is the easiest way to get started
+ const messages = await getMessages();
+
+ return (
+
+
+
+ {children}
+
+
+
+ );
+}
+```
+
+Create a page component to render the layout.
+
+```tsx
+"use client";
+
+import {useTranslations} from 'next-intl';
+
+export default function HomePage() {
+ const i18n = useTranslations();
+
+ return (
+
+
{i18n('users.title')}
+
{i18n('auth.login')}
+
+ );
+}
+```
+
+#### Locale switcher component
+Also somewhere in the app makre sure to put the `LocaleSwitcher` component.
+Here's brief code on how to create `LocaleSwitcher` component. I've used [shadcn ui](https://ui.shadcn.com/) for components.
+
+```tsx
+// src/app/[locale]/components/LocaleSwitcher.tsx
+"use client";
+
+import { Button } from "@/components/ui/button";
+import {
+ DropdownMenu,
+ DropdownMenuContent,
+ DropdownMenuRadioGroup,
+ DropdownMenuRadioItem,
+ DropdownMenuTrigger,
+} from "@components/ui/dropdown-menu";
+import { ChevronDown, Languages } from "lucide-react";
+import React, { useTransition } from "react";
+import { useSearchParams } from "next/navigation";
+import { Locale, usePathname, useRouter } from "../i18n/routing";
+import { ChevronDown, Languages } from "lucide-react";
+
+const locales = [
+ { value: "en", label: "English" },
+ { value: "ne", label: "Nepali" },
+];
+
+export function LocaleSwitcherDropdown() {
+ const router = useRouter();
+ const [isPending, startTransition] = useTransition();
+ const pathname = usePathname();
+ const searchParams = useSearchParams();
+ const locale = useLocale();
+
+
+ function onChange(value: string) {
+ const nextLocale = value as Locale;
+
+ startTransition(() => {
+ router.replace(`${pathname}?${new URLSearchParams(searchParams)}`, {
+ locale: nextLocale,
+ });
+ router.refresh();
+ });
+ }
+
+ return (
+
+
+
+
+
+
+ {locales.map((val) => (
+
+ {val.label}
+
+ ))}
+
+
+
+ );
+}
+```
+
+
+## Typesafety in translations
+
+By default next-intl doesn't provide typesafety in translations, that means there is high chance of typo errors in translations.
+
+eg : `i18n('users.abc')` instead of `i18n('users.title')` or we might access the translations which are not defined in the translations file.
+
+To overcome this we can create a global type definition file `global.d.ts` and define the types for translations.
+
+
+In root of the project create a file called `global.d.ts` and define the types for translations.
+
+```ts
+// global.d.ts
+
+type UsersMessages = typeof import("./messages/en/users.json");
+type AuthMessages = typeof import("./messages/en/auth.json");
+
+// Importing other language files ..
+
+// Create a new type by combining all message types
+type Messages = UsersMessages & AuthMessages;
+
+declare interface IntlMessages extends Messages {}
+```
+
+
+Only catch is that you need to have same translation structure for both `en` and `ne` locales since we take `en` as base for typesafety.
+
+
+Now if you try to access the translations which are not defined in the translations file, you will get typesafety error.
+
+
+
+
+
+Also if you are using server components and using `getTranslations` method, its equally typesafe.
+
+
+```ts
+import {getTranslations} from 'next-intl/server';
+
+export default async function HomePage() {
+ const i18n = await getTranslations();
+
+ return (
+
+
{i18n('users.title')}
+
{i18n('auth.login')}
+
+ )
+}
+```
+
+
+### Using translations outside of React components
+
+Till now we have seen how to use translations inside React components, but what if we want to use translations outside of React components.
+
+Infact there's blog on [How (not) to use translations outside of React components](https://next-intl-docs.vercel.app/blog/translations-outside-of-react-components) which recommends
+not to use translations outside of React components.
+
+But sometimes things like array of objects, or in some utility functions we might need translations. Putting this inside the components
+might not be a good idea since the components might be too larger.
+
+In that case it will be better if we can pass the translations instance as a parameter to the function and the function can use the translations.
+
+
+Before that let's create a utility type which will help to access the translations outside of React components in type-safe way.
+
+Create a file called `types.ts` inside the `i18n` folder.
+
+```ts
+// src/i18n/types.ts
+
+import { useTranslations } from "next-intl";
+
+import { ReactElement, ReactNode } from "react";
+import {
+ Formats,
+ MessageKeys,
+ NamespaceKeys,
+ NestedKeyOf,
+ NestedValueOf,
+ RichTranslationValues,
+ TranslationValues,
+} from "next-intl";
+
+export interface TFunction<
+ NestedKey extends NamespaceKeys<
+ IntlMessages,
+ NestedKeyOf
+ > = never,
+> {
+ <
+ TargetKey extends MessageKeys<
+ NestedValueOf<
+ {
+ "!": IntlMessages;
+ },
+ [NestedKey] extends [never] ? "!" : `!.${NestedKey}`
+ >,
+ NestedKeyOf<
+ NestedValueOf<
+ {
+ "!": IntlMessages;
+ },
+ [NestedKey] extends [never] ? "!" : `!.${NestedKey}`
+ >
+ >
+ >,
+ >(
+ key: TargetKey,
+ values?: TranslationValues,
+ formats?: Partial,
+ ): string;
+ rich<
+ TargetKey extends MessageKeys<
+ NestedValueOf<
+ {
+ "!": IntlMessages;
+ },
+ [NestedKey] extends [never] ? "!" : `!.${NestedKey}`
+ >,
+ NestedKeyOf<
+ NestedValueOf<
+ {
+ "!": IntlMessages;
+ },
+ [NestedKey] extends [never] ? "!" : `!.${NestedKey}`
+ >
+ >
+ >,
+ >(
+ key: TargetKey,
+ values?: RichTranslationValues,
+ formats?: Partial,
+ ): string | ReactElement | ReactNode;
+ raw<
+ TargetKey extends MessageKeys<
+ NestedValueOf<
+ {
+ "!": IntlMessages;
+ },
+ [NestedKey] extends [never] ? "!" : `!.${NestedKey}`
+ >,
+ NestedKeyOf<
+ NestedValueOf<
+ {
+ "!": IntlMessages;
+ },
+ [NestedKey] extends [never] ? "!" : `!.${NestedKey}`
+ >
+ >
+ >,
+ >(key: TargetKey): any;
+}
+
+```
+
+> 😵💫 The above type is bit confusing, you can just copy and paste 🤪, Thanks to [fitimbytyqi](https://github.com/amannn/next-intl/issues/500#issuecomment-2358249892) for providing snippet
+
+
+Now let's access the instance of translations outside of React components.
+
+```tsx
+// src/[locale]/page.tsx
+
+"use client";
+import { useTranslations } from "next-intl";
+import { TFunction } from "../i18n/types";
+
+const getNavItems = (i18n: TFunction) => [
+ { label: i18n("auth.login"), href: "/login" },
+ { label: i18n("auth.register"), href: "/signup" },
+];
+
+export default function HomePage() {
+ const i18n = useTranslations();
+
+ return (
+
+ );
+}
+
+```
+
+
+We pass the translations instance to the `getNavItems` function and the function can use the translations. The i18n instance is type-safe and we can't access the translations which are not defined in the translations file.
+
+
+
+
+## Wrapping up
+
+Next-intl is a great library to internationalize your Next.js app. It supports most seamless way of applying internationalization to Next.js app with support for server components.
+Although there are some limitations like translations outside of React components, low typesafety in translations, but we can overcome these limitations by using some workarounds as mentioned in this article.
+
+If you have any questions or feedback, feel free to reach out to me on [X.com](https://x.com/adarsha_ach) / [Linkedin](https://www.linkedin.com/in/adarshaacharya/) or comment below.