---
createdAt: 2025-08-06
updatedAt: 2026-08-06
title: "Solid Start i18n - Complete guide to translate your app"
description: "No more i18next. The 2026 guide to building a multilingual (i18n) SolidStart app. Server-rendered locale routing, hreflang, sitemap, and AI-assisted translation."
keywords:
- Internationalization
- Documentation
- Intlayer
- SolidStart
- Solid
- i18n
- TypeScript
- Locale Routing
- Sitemap
slugs:
- doc
- environment
- solid-start
applicationTemplate: https://github.com/aymericzip/intlayer-solid-start-template
applicationShowcase: https://intlayer-solid-start-template.vercel.app
history:
- version: 9.1.3
date: 2025-08-06
changes: "Initial history"
author: aymericzip
---
# Translate your SolidStart website using Intlayer | Internationalization (i18n)
## Table of Contents
This guide covers a **server-rendered** SolidStart application: locale detection happens on the request, pages are rendered on the server in the right language, and the ``, `hreflang` and sitemap signals search engines need are emitted server-side.
## Why Intlayer over alternatives?
Compared to main solutions like `@solid-primitives/i18n` or `i18next`, Intlayer is a solution that comes with integrated optimizations such as:
Intlayer is optimized to work perfectly with Solid by offering **component-level content scoping**, **reactive translations**, and all the features needed for scaling internationalization (i18n).
Instead of loading massive JSON files into your pages, load only the necessary content. Intlayer helps **reduce your bundle and page sizes by up to 50%**.
Scoping your application's content **facilitates maintenance** for large-scale applications. You can duplicate or delete a single feature folder without the mental burden of reviewing your entire content codebase. Additionally, Intlayer is **fully typed** to ensure your content's accuracy.
Co-locating content **reduces the context needed** by Large Language Models (LLMs). Intlayer also comes with a suite of tools, such as a **CLI** to test for missing translations,**[LSP](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/lsp.md)**, **[MCP](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/mcp_server.md)**, and **[agent skills](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/agent_skills.md)**, to make the developer experience (DX) even smoother for AI agents.
Use automation to translate in your CI/CD pipeline using the LLM of your choice at the cost of your AI provider. Intlayer also offers a **compiler** to automate content extraction, as well as a [web platform](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/intlayer_CMS.md) to help **translate in the background**.
Connecting massive JSON files to components can lead to performance and reactivity issues. Intlayer optimizes your content loading at build time.
More than just an i18n solution, Intlayer provides an **self-hosted [visual editor](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/intlayer_visual_editor.md)** and a **[full CMS](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/intlayer_CMS.md)** to help you manage your multilingual content in **real-time**, making collaboration with translators, copywriters, and other team members seamless. Content can be stored locally and/or remotely.
---
## Step-by-Step Guide to Set Up Intlayer in a SolidStart Application
Install the necessary packages using npm:
```bash packageManager="npm"
npx intlayer init --interactive
```
```bash packageManager="pnpm"
pnpm dlx intlayer@canary init --interactive
```
```bash packageManager="yarn"
yarn dlx intlayer@canary init --interactive
```
```bash packageManager="bun"
bunx intlayer@canary init --interactive
```
> the `--interactive` flag is optional. Use `intlayer-cli init` if you're an AI agent.
> This command will detect your environment and install the required packages. For example:
```bash packageManager="npm"
npm install intlayer solid-intlayer vite-intlayer
```
```bash packageManager="pnpm"
pnpm add intlayer solid-intlayer vite-intlayer
```
```bash packageManager="yarn"
yarn add intlayer solid-intlayer vite-intlayer
```
```bash packageManager="bun"
bun add intlayer solid-intlayer vite-intlayer
```
- **intlayer**
The core package that provides internationalization tools for configuration management, translation, [content declaration](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/dictionary/content_file.md), transpilation, and [CLI commands](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/cli/index.md).
- **solid-intlayer**
The package that integrates Intlayer with Solid application. It provides context providers and hooks for Solid internationalization.
- **vite-intlayer**
Includes the Vite plugin for integrating Intlayer with the [Vite bundler](https://vite.dev/guide/why.html#why-bundle-for-production), as well as the locale-routing handler that detects the user's preferred locale, manages cookies, and handles URL redirection.
> `vite-intlayer` is a server-side concern here, not only a build-time one: it supplies the request handler that SolidStart's Nitro server runs. Keeping it in `dependencies` is the safe default — you can move it to `devDependencies` only if you deploy the built `.output` directory, into which Nitro inlines the handler.
Create a config file to configure the languages of your application:
```typescript fileName="intlayer.config.ts" codeFormat={["typescript", "esm", "commonjs"]}
import { type IntlayerConfig, Locales } from "intlayer";
const config: IntlayerConfig = {
internationalization: {
locales: [
Locales.ENGLISH,
Locales.FRENCH,
Locales.SPANISH,
// Your other locales
],
defaultLocale: Locales.ENGLISH,
},
routing: {
mode: "prefix-no-default",
},
};
export default config;
```
With `prefix-no-default`, the default locale is served from unprefixed URLs:
```plaintext
/ /about → English (default locale)
/fr /fr/about → French
/es /es/about → Spanish
```
> Through this configuration file, you can set up localized URLs, middleware redirection, cookie names, the location and extension of your content declarations, disable Intlayer logs in the console, and more. For a complete list of available parameters, refer to the [configuration documentation](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/configuration.md).
Add the Intlayer plugin to your configuration:
```typescript fileName="vite.config.ts" codeFormat={["typescript", "esm", "commonjs"]}
import { solidStart } from "@solidjs/start/config";
import { nitro } from "nitro/vite";
import { defineConfig } from "vite";
import { intlayer } from "vite-intlayer";
export default defineConfig({
plugins: [solidStart(), nitro(), intlayer()],
});
```
> The `intlayer()` Vite plugin builds your content declaration files, watches them in development mode, and defines the Intlayer environment variables inside the application. It also provides aliases that optimize performance.
### Locale routing comes with the plugin
SolidStart runs on [Nitro](https://nitro.build), and `intlayer()` registers its locale-routing handler directly into Nitro's server pipeline (through the `routing.enableProxy` option, `true` by default). Nothing else to wire: on a built server, every request is inspected before it reaches the router, and
- the locale is read from the URL prefix, then the `INTLAYER_LOCALE` cookie, then the `Accept-Language` header;
- a non-prefixed URL is redirected to its localized counterpart when the resolved locale is not the default one (`/` → `/fr`);
- a redundantly prefixed URL is redirected back to its canonical form (`/en/about` → `/about`);
- the locale cookie is written back on the response.
Create and manage your content declarations to store translations:
```tsx fileName="src/contents/home.content.ts" contentDeclarationFormat={["typescript", "esm", "commonjs"]}
import { type Dictionary, t } from "intlayer";
const homeContent = {
key: "home-page",
content: {
title: t({
en: "Hello world!",
fr: "Bonjour le monde !",
es: "¡Hola mundo!",
}),
metaTitle: "SolidStart + Intlayer",
metaDescription: t({
en: "A SolidStart application internationalized with Intlayer.",
fr: "Une application SolidStart internationalisée avec Intlayer.",
es: "Una aplicación SolidStart internacionalizada con Intlayer.",
}),
documentation: t({
en: "Visit start.solidjs.com to learn how to build SolidStart apps.",
fr: "Visitez start.solidjs.com pour apprendre à créer des applications SolidStart.",
es: "Visita start.solidjs.com para aprender a crear aplicaciones SolidStart.",
}),
},
} satisfies Dictionary;
export default homeContent;
```
```json fileName="src/contents/home.content.json" contentDeclarationFormat="json"
{
"$schema": "https://intlayer.org/schema.json",
"key": "home-page",
"content": {
"title": {
"nodeType": "translation",
"translation": {
"en": "Hello world!",
"fr": "Bonjour le monde !",
"es": "¡Hola mundo!"
}
},
"metaTitle": "SolidStart + Intlayer",
"metaDescription": {
"nodeType": "translation",
"translation": {
"en": "A SolidStart application internationalized with Intlayer.",
"fr": "Une application SolidStart internationalisée avec Intlayer.",
"es": "Una aplicación SolidStart internacionalizada con Intlayer."
}
},
"documentation": {
"nodeType": "translation",
"translation": {
"en": "Visit start.solidjs.com to learn how to build SolidStart apps.",
"fr": "Visitez start.solidjs.com pour apprendre à créer des applications SolidStart.",
"es": "Visita start.solidjs.com para aprender a crear aplicaciones SolidStart."
}
}
}
}
```
> ⚠️ **SolidStart-specific gotcha**: every `.ts` / `.tsx` file under `src/routes` becomes a route, and a `.content.ts` file has a default export, so it would be picked up as a page. Keep the content declarations of your **pages** outside the routes directory (`src/contents/` works well). Content of **components** can stay co-located, since `src/components` is not scanned by the file-system router.
> Your content declarations can be defined anywhere in your application as soon as they are included in the `contentDir` directory (by default, `./src`), and match the content declaration file extension (by default, `.content.{json,ts,tsx,js,jsx,mjs,cjs,md,mdx,yaml,yml}`).
>
> For more details, refer to the [content declaration documentation](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/dictionary/content_file.md).
The goal of this step is to give each language its own URL, which is what search engines index.
Move your pages under an **optional dynamic segment**. In SolidStart's file-system router, `[[locale]]` compiles to the `:locale?` path pattern:
```plaintext
src/routes/
[[locale]].tsx ← layout that validates the segment
[[locale]]/
index.tsx → / and /fr and /es
about.tsx → /about and /fr/about and /es/about
[...404].tsx → catch-all for anything else
```
The layout file's only job is to constrain the segment to a configured locale:
```tsx fileName="src/routes/[[locale]].tsx" codeFormat="typescript"
import type { RouteSectionProps } from "@solidjs/router";
import { locales } from "intlayer";
export const route = {
matchFilters: {
locale: locales,
},
};
export default function LocaleLayout(props: RouteSectionProps) {
return <>{props.children};
}
```
`@solidjs/router` expands `:locale?` into two patterns — one with the segment and one without — and tries them by descending specificity. `matchFilters` is what makes the difference between a working setup and a confusing one:
| URL | Without `matchFilters` | With `matchFilters` |
| ----------- | ---------------------------------------------- | --------------------------------------------- |
| `/fr/about` | French about page | French about page |
| `/about` | About page (static segment wins) | About page |
| `/unknown` | **Home page**, silently, with `locale=unknown` | No match → falls through to the catch-all 404 |
> Prefer `[locale]` (required) over `[[locale]]` if you use the `'prefix-all'` routing mode, and drop the segment entirely for `'no-prefix'` or `'search-params'`.
The URL is the single source of truth for the locale: the middleware has already redirected the request to its localized path, so reading the path in the root layout keeps the server render and the client hydration in agreement, and makes every client-side navigation update the locale for free.
```tsx fileName="src/app.tsx" codeFormat="typescript"
import { MetaProvider } from "@solidjs/meta";
import { Router, useLocation } from "@solidjs/router";
import { FileRoutes } from "@solidjs/start/router";
import { defaultLocale, getHTMLTextDir, getLocaleFromPath } from "intlayer";
import { IntlayerProvider } from "solid-intlayer";
import { createEffect, type ParentProps, Suspense } from "solid-js";
import { isServer } from "solid-js/web";
import { Nav } from "~/components/Nav";
import "./app.css";
const RootLayout = (props: ParentProps) => {
const location = useLocation();
const locale = () => getLocaleFromPath(location.pathname) ?? defaultLocale;
// The server renders in entry-server.tsx; client-side navigations
// between locales have to update the attributes themselves.
createEffect(() => {
if (isServer) return;
document.documentElement.lang = locale();
document.documentElement.dir = getHTMLTextDir(locale());
});
return (
{props.children}
);
};
export default function App() {
return (
);
}
```
> `IntlayerProvider` reacts to its `locale` prop, so passing the accessor call `locale()` inside JSX is enough — Solid compiles it to a getter, and the whole tree re-renders in the new language when the URL changes.
The `` element is rendered by `entry-server.tsx`, outside the `Router`. Read the locale from the request URL instead:
```tsx fileName="src/entry-server.tsx" codeFormat="typescript"
// @refresh reload
import { createHandler, StartServer } from "@solidjs/start/server";
import { defaultLocale, getHTMLTextDir, getLocaleFromPath } from "intlayer";
import { getRequestEvent } from "solid-js/web";
export default createHandler(() => (
{
const url = getRequestEvent()?.request.url ?? "/";
const locale = getLocaleFromPath(url) ?? defaultLocale;
return (
{assets}
{children}
{scripts}
);
}}
/>
));
```
Crawlers now receive the right language on the first byte:
```html
```
Access your content dictionaries throughout your application:
```tsx fileName="src/routes/[[locale]]/index.tsx" codeFormat="typescript"
import { Meta, Title } from "@solidjs/meta";
import { useIntlayer } from "solid-intlayer";
import Counter from "~/components/Counter";
export default function Home() {
const content = useIntlayer("home-page");
return (
{content.metaTitle.value}
{content.title}
{content.documentation}
);
}
```
> In Solid, `useIntlayer` returns reactive content (e.g., `content`). You can access its properties directly.
> If you want to use your content in a `string` attribute, such as `alt`, `title`, `href`, `aria-label`, etc., you can use the value of the function, like:
>
> ```html
>
>
>
> ```
> To learn more about the `useIntlayer` hook, refer to the [documentation](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/packages/solid-intlayer/useIntlayer.md).
Content nodes are not limited to plain translations. A pluralized counter, for example:
```typescript fileName="src/components/Counter.content.ts" codeFormat="typescript"
import { type Dictionary, plural, t } from "intlayer";
const counterContent = {
key: "counter",
content: {
clicks: plural({
one: t({
en: "{{count}} click",
fr: "{{count}} clic",
es: "{{count}} clic",
}),
other: t({
en: "{{count}} clicks",
fr: "{{count}} clics",
es: "{{count}} clics",
}),
}),
},
} satisfies Dictionary;
export default counterContent;
```
```tsx fileName="src/components/Counter.tsx" codeFormat="typescript"
import { useIntlayer } from "solid-intlayer";
import { createSignal } from "solid-js";
export default function Counter() {
const [count, setCount] = createSignal(0);
const content = useIntlayer("counter");
return (
);
}
```
`plural()` selects the category through `Intl.PluralRules` for the active locale, so languages with more than two plural forms work without any extra code.
Create a custom `Link` component that automatically prefixes internal URLs with the current language:
```tsx fileName="src/components/LocalizedLink.tsx" codeFormat="typescript"
import { A, type AnchorProps } from "@solidjs/router";
import { getLocalizedUrl } from "intlayer";
import { useLocale } from "solid-intlayer";
import type { ParentComponent } from "solid-js";
export const LocalizedLink: ParentComponent = (props) => {
const { locale } = useLocale();
const isExternal = () => /^[a-z][a-z0-9+.-]*:/i.test(props.href);
const localizedHref = () =>
isExternal() ? props.href : getLocalizedUrl(props.href, locale());
return ;
};
```
```tsx fileName="src/components/Nav.tsx" codeFormat="typescript"
import { useIntlayer } from "solid-intlayer";
import type { Component } from "solid-js";
import { LocaleSwitcher } from "./LocaleSwitcher";
import { LocalizedLink } from "./LocalizedLink";
export const Nav: Component = () => {
const content = useIntlayer("nav");
return (
);
};
```
Writing `href="/about"` once now produces `/about`, `/fr/about` or `/es/about` depending on the active locale — no manual prefixing anywhere in your pages.
Render the switcher as **real anchors** rather than a `
`hreflang` annotations tell search engines that `/about`, `/fr/about` and `/es/about` are the same page in different languages. `getMultilingualUrls` derives them from the canonical (locale-free) path, following your routing mode, so nothing is hard-coded:
```tsx fileName="src/components/AlternateLinks.tsx" codeFormat="typescript"
import {
defaultLocale,
getMultilingualUrls,
getPathWithoutLocale,
} from "intlayer";
import { type Component, For } from "solid-js";
export type AlternateLinksProps = {
/** Absolute URL of the page being rendered. */
url: string;
};
export const AlternateLinks: Component = (props) => {
const multilingualUrls = () => {
const { origin, pathname } = new URL(props.url);
return Object.entries(
getMultilingualUrls(`${origin}${getPathWithoutLocale(pathname)}`)
);
};
const canonicalUrl = () =>
new URL(props.url).origin + new URL(props.url).pathname;
return (
<>
{([locale, localizedUrl]) => (
)}
locale === defaultLocale)?.[1]
}
hreflang="x-default"
rel="alternate"
/>
);
};
```
Render it in the document head, where the request URL is available:
```tsx fileName="src/entry-server.tsx" codeFormat="typescript"
import { AlternateLinks } from "~/components/AlternateLinks";
// … inside , next to the other meta tags:
;
```
`GET /fr/about` then serves:
```html
```
> **Note on `@solidjs/meta`**: at the time of writing, `` and `<Meta>` from `@solidjs/meta` are applied on the client after hydration but are **not** emitted into the server-rendered `<head>` in SolidStart v2. Until that is fixed upstream, render the tags that crawlers must see without JavaScript — `canonical`, `hreflang`, and if needed `title` / `description` — directly in `entry-server.tsx`, as shown above.
</Step>
<Step number={12} title="Manage not found pages" isOptional={true}>
A splat route at the root of `src/routes` catches every path the locale segment did not match — including invalid locale prefixes rejected by `matchFilters`. Because the locale still comes from the URL through the root layout, the 404 page is displayed in the visitor's language:
```tsx fileName="src/routes/[...404].tsx" codeFormat="typescript"
import { Title } from "@solidjs/meta";
import { HttpStatusCode } from "@solidjs/start";
import { useIntlayer } from "solid-intlayer";
import { LocalizedLink } from "~/components/LocalizedLink";
export default function NotFound() {
const content = useIntlayer("not-found-page");
return (
<main>
<Title>{content.metaTitle.value}
{content.title}
{content.backHome}
);
}
```
| Request | Result |
| ----------------- | --------------------------------------- |
| `/xx` | `404` — `xx` is not a configured locale |
| `/nonexistent` | `404` in the default locale |
| `/fr/nonexistent` | `404` in French (`Page introuvable`) |
Intlayer's sitemap generator expands every path into one entry per locale and wires the `xhtml:link` alternates between them, so the route only has to list the canonical, locale-free paths.
> Unlike basic generators that only emit flat URLs, Intlayer wires bidirectional links between every localized variant of each page, which helps search engines relate localized URLs and serve the right one to the right audience.
SolidStart turns a file exporting an HTTP method into an API route, and strips the `.ts` extension from the path — so `src/routes/sitemap.xml.ts` is served at `/sitemap.xml`:
```typescript fileName="src/routes/sitemap.xml.ts" codeFormat={["typescript", "esm", "commonjs"]}
import type { APIEvent } from "@solidjs/start/server";
import { generateSitemap } from "intlayer";
const SITE_URL = process.env.SITE_URL ?? "http://localhost:3000";
export const GET = (_event: APIEvent) => {
const sitemap = generateSitemap(
[
{ path: "/", changefreq: "daily", priority: 1.0 },
{ path: "/about", changefreq: "monthly", priority: 0.8 },
],
{ siteUrl: SITE_URL }
);
return new Response(sitemap, {
headers: { "Content-Type": "application/xml" },
});
};
```
```xml fileName="output of GET /sitemap.xml"
https://example.com/aboutmonthly0.8
```
> API routes do not support optional parameters, so keep this file at the root of `src/routes`, outside the `[[locale]]` segment. The sitemap already contains every locale.
You can build a `robots.txt` the same way with `getMultilingualUrls`, so that `Disallow` entries cover every localized spelling of a sensitive path:
```typescript fileName="src/routes/robots.txt.ts" codeFormat={["typescript", "esm", "commonjs"]}
import { getMultilingualUrls } from "intlayer";
const SITE_URL = process.env.SITE_URL ?? "http://localhost:3000";
const disallowedPaths = ["/admin", "/private"].flatMap((path) =>
Object.values(getMultilingualUrls(path))
);
export const GET = () =>
new Response(
[
"User-agent: *",
"Allow: /",
...disallowedPaths.map((path) => `Disallow: ${path}`),
"",
`Sitemap: ${SITE_URL}/sitemap.xml`,
].join("\n"),
{ headers: { "Content-Type": "text/plain" } }
);
```
You may want to access the current locale from inside a server function or an API route.
In a prefix-based setup like this one, **the URL is authoritative**: `getLocaleFromPath` reads the prefix from the request URL. `getLocale` is the fallback for requests that carry no locale prefix — it inspects the `INTLAYER_LOCALE` cookie, then the `x-intlayer-locale` header, then negotiates `Accept-Language`.
```tsx fileName="src/routes/[[locale]]/index.tsx" codeFormat="typescript"
import { createAsync } from "@solidjs/router";
import { getCookie, getIntlayer, getLocale, getLocaleFromPath } from "intlayer";
import { getRequestEvent } from "solid-js/web";
const loadLocalizedData = async () => {
"use server";
const request = getRequestEvent()?.request;
const locale =
getLocaleFromPath(request?.url) ??
(await getLocale({
// Get the cookie from the request (default: 'INTLAYER_LOCALE')
getCookie: (name) =>
getCookie(name, request?.headers.get("cookie") ?? ""),
// Get the header from the request (default: 'x-intlayer-locale'),
// falling back to Accept-Language negotiation
getHeader: (name) => request?.headers.get(name) ?? undefined,
}));
// Retrieve some content outside of a component using getIntlayer()
const content = getIntlayer("home-page", locale);
return { locale, title: String(content.title) };
};
export default function Page() {
const data = createAsync(() => loadLocalizedData());
return
{data()?.title}
;
}
```
> Do not rely on `getLocale` alone here: the locale cookie is only written once a visitor actively switches language, so a first visit to `/fr/...` would resolve to the default locale.
If you have an existing codebase, transforming thousands of files can be time-consuming.
To ease this process, Intlayer proposes a [compiler](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/compiler.md) / [extractor](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/cli/extract.md) to transform your components and extract the content.
To set it up, you can add a `compiler` section in your `intlayer.config.ts` file:
```typescript fileName="intlayer.config.ts" codeFormat={["typescript", "esm", "commonjs"]}
import { type IntlayerConfig } from "intlayer";
const config: IntlayerConfig = {
// ... Rest of your config
compiler: {
/**
* Indicates if the compiler should be enabled.
*/
enabled: true,
/**
* Defines the output files path
*/
output: ({ fileName, extension }) => `./${fileName}${extension}`,
/**
* Indicates if the components should be saved after being transformed.
*
* - If `true`, the compiler will rewrite the component file in the disk. So the transformation will be permanent, and the compiler will skip the transformation for the next process. That way, the compiler can transform the app, and then it can be removed.
*
* - If `false`, the compiler will inject the `useIntlayer()` function call into the code in the build output only, and keep the base codebase intact. The transformation will be done only in memory.
*/
saveComponents: false,
/**
* Dictionary key prefix
*/
dictionaryKeyPrefix: "",
},
};
export default config;
```
Run the extractor to transform your components and extract the content
```bash packageManager="npm"
npx intlayer extract
```
```bash packageManager="pnpm"
pnpm intlayer extract
```
```bash packageManager="yarn"
yarn intlayer extract
```
```bash packageManager="bun"
bun x intlayer extract
```
> Move the generated content files of your pages out of `src/routes` afterwards, for the reason explained in step 5.
> Since v9, the `intlayerCompiler` is included in the `intlayer` plugin. So you don't need to add it manually.
Update your `vite.config.ts` to include the `intlayerCompiler` plugin:
```ts fileName="vite.config.ts"
import { solidStart } from "@solidjs/start/config";
import { nitro } from "nitro/vite";
import { defineConfig } from "vite";
import { intlayer, intlayerCompiler } from "vite-intlayer";
export default defineConfig({
plugins: [
solidStart({ middleware: "src/middleware.ts" }),
nitro(),
intlayer(),
intlayerCompiler(), // Adds the compiler plugin
],
});
```
```bash packageManager="npm"
npm run build # Or npm run dev
```
```bash packageManager="pnpm"
pnpm run build # Or pnpm run dev
```
```bash packageManager="yarn"
yarn build # Or yarn dev
```
```bash packageManager="bun"
bun run build # Or bun run dev
```
Intlayer uses module augmentation to get the benefits of TypeScript and make your codebase stronger.
Ensure your TypeScript configuration includes the autogenerated types:
```json5 fileName="tsconfig.json"
{
compilerOptions: {
// ... your existing configurations
},
include: [
"src",
"*.ts",
".intlayer/**/*.ts", // Include the auto-generated types
],
}
```
Dictionary keys and content paths are now checked at compile time:
```tsx
useIntlayer("home-page"); // ✅
useIntlayer("hom-page"); // ❌ Argument of type '"hom-page"' is not assignable to parameter of type 'keyof __DictionaryRegistry'
```
---
## Verifying your setup
Build and start the server, then check that these requests behave as expected:
```bash
npm run build
node .output/server/index.mjs
```
| Request | Expected response |
| ---------------------------------------- | ------------------------------------- |
| `GET /` | `200` — English |
| `GET /` with `Accept-Language: fr` | `302` → `/fr` |
| `GET /` with cookie `INTLAYER_LOCALE=es` | `302` → `/es` |
| `GET /fr` | `200` — French, `` |
| `GET /fr/about` | `200` — French about page |
| `GET /en/about` | `302` → `/about` (canonical redirect) |
| `GET /xx` | `404` |
| `GET /fr/nonexistent` | `404` in French |
| `GET /sitemap.xml` | `200` — multilingual XML sitemap |
The rows that render a page behave identically under `vite dev`. The three redirect rows only apply to a built server unless you register the handler as a middleware yourself — see step 3.
> Run the dev server on Node (`vite dev`) rather than on Bun (`bun --bun vite dev`): SolidStart's SSR currently fails under the Bun runtime with `Expected a Response object, but received 'NodeResponse'`. This is unrelated to Intlayer — it reproduces on the plain template — and only affects the dev server, not `vite build`.
---
## Git Configuration
It is recommended to ignore the files generated by Intlayer. This allows you to avoid committing them to your Git repository.
To do this, you can add the following instructions to your `.gitignore` file:
```plaintext fileName=".gitignore"
# Ignore the files generated by Intlayer
.intlayer
```
---
## VS Code Extension
To improve your development experience with Intlayer, you can install the official **Intlayer VS Code Extension**.
[Install from the VS Code Marketplace](https://marketplace.visualstudio.com/items?itemName=intlayer.intlayer-vs-code-extension)
This extension provides:
- **Autocompletion** for translation keys.
- **Real-time error detection** for missing translations.
- **Inline previews** of translated content.
- **Quick actions** to easily create and update translations.
---
## Go Further
To go further, you can implement the [visual editor](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/intlayer_visual_editor.md) or externalize your content using the [CMS](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/intlayer_CMS.md).
---
## Documentation References
- [Intlayer Documentation](https://intlayer.org)
- [SolidStart Documentation](https://start.solidjs.com)
- [useIntlayer hook](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/packages/solid-intlayer/useIntlayer.md)
- [useLocale hook](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/packages/solid-intlayer/useLocale.md)
- [Content Declaration](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/dictionary/content_file.md)
- [Configuration](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/configuration.md)
> })
> })
> ```
> To learn more about the `useIntlayer` hook, refer to the [documentation](https://github.com/aymericzip/intlayer/blob/main/docs/docs/en/packages/solid-intlayer/useIntlayer.md).
Content nodes are not limited to plain translations. A pluralized counter, for example:
```typescript fileName="src/components/Counter.content.ts" codeFormat="typescript"
import { type Dictionary, plural, t } from "intlayer";
const counterContent = {
key: "counter",
content: {
clicks: plural({
one: t({
en: "{{count}} click",
fr: "{{count}} clic",
es: "{{count}} clic",
}),
other: t({
en: "{{count}} clicks",
fr: "{{count}} clics",
es: "{{count}} clics",
}),
}),
},
} satisfies Dictionary;
export default counterContent;
```
```tsx fileName="src/components/Counter.tsx" codeFormat="typescript"
import { useIntlayer } from "solid-intlayer";
import { createSignal } from "solid-js";
export default function Counter() {
const [count, setCount] = createSignal(0);
const content = useIntlayer("counter");
return (
);
}
```
`plural()` selects the category through `Intl.PluralRules` for the active locale, so languages with more than two plural forms work without any extra code.