Intlayer supports two ways to declare multilingual content:

• Single file with all translations
• One file per locale (per-locale format)

This flexibility enables:

• Easy migration from other i18n tools
• Support for automated translation workflows
• Clear organisation of translations into separate, locale-specific files

Single File with Multiple Translations

This format is ideal for:

• Quick iteration in code.
• Seamless integration with the CMS.

This is the recommended approach for most use cases. It centralises translations, making it easy to iterate and integrate with the CMS.

import { t, type Dictionary } from "intlayer";const helloWorldContent = {  key: "hello-world",  content: {    multilingualContent: t({      "en-GB": "Title of my component",      en: "Title of my component",      es: "Título de mi componente",    }),  },} satisfies Dictionary;export default helloWorldContent;

Recommended: This format is best when using Intlayer's visual editor or managing translations directly in the code.

Per-Locale Format

This format is useful when:

• You want to version or override translations independently.
• You're integrating machine or human translation workflows.

You can also split translations into individual locale files by specifying the locale field:

import { t, Locales, type Dictionary } from "intlayer";const helloWorldContent = {  key: "hello-world",  locale: Locales.ENGLISH, // Important  content: { multilingualContent: "Title of my component" },} satisfies Dictionary;export default helloWorldContent;

import { t, Locales, type Dictionary } from "intlayer";const helloWorldContent = {  key: "hello-world",  locale: Locales.SPANISH, // Important  content: { multilingualContent: "Título de mi componente" },};

Important: Make sure the locale field is defined. It tells Intlayer which language the file represents.

Note: In both cases, the content declaration file must follow the naming pattern *.content.{ts,tsx,js,jsx,mjs,cjs,json} to be recognised by Intlayer. The .[locale] suffix is optional and used only as a naming convention.

Mixing Formats

You can mix both approaches for the same content key. For example:

Declare default or base content statically (e.g., index.content.ts)

Add or override locale-specific content in index.content.json, index.fr.content.ts, etc.

This is especially useful when:

• You want to declare your base content statically in your codebase and fill automatically with translations in the CMS.

.└── Components    └── MyComponent        ├── index.content.ts        ├── index.content.json        └── index.ts

Example

Here a multilingual content declaration file:

import { t, type Dictionary } from "intlayer";const helloWorldContent = {  key: "hello-world",  locale: Locales.ENGLISH,  content: {    multilingualContent: "Title of my component",    projectName: "My project",  },} satisfies Dictionary;export default helloWorldContent;

{  "$schema": "/schema.json",  "key": "hello-world",  "content": {    "multilingualContent": {      "nodeType": "translation",      "translation": {        "en-GB": "Title of my component",        "fr": "Titre de mon composant",        "es": "Título de mi componente"      }    }  }}

Intlayer merges multilingual and per-locale files automatically.

import { getIntlayer, Locales } from "intlayer";const intlayer = getIntlayer("hello-world"); // Default locale is ENGLISH, so it will return the ENGLISH contentconsole.log(JSON.stringify(intlayer, null, 2));// Result:// {//  "multilingualContent": "Title of my component",//  "projectName": "My project"// }const intlayer = getIntlayer("hello-world", Locales.SPANISH);console.log(JSON.stringify(intlayer, null, 2));// Result:// {//  "multilingualContent": "Título de mi componente",//  "projectName": "My project"// }const intlayer = getIntlayer("hello-world", Locales.FRENCH);console.log(JSON.stringify(intlayer, null, 2));// Result:// {//  "multilingualContent": "Titre de mon composant",//  "projectName": "My project"// }

Automatic Translation Generation

Use the intlayer CLI to auto-fill missing translations based on your preferred services.