Creation:2026-01-21Last update:2026-01-21

    fastify-intlayer Package

    The fastify-intlayer package provides a plugin for Fastify applications to handle internationalisation. It detects the user's locale and decorates the request object.

    Installation

    npm install fastify-intlayer

    Exports

    Plugin

    Import:

    import "fastify-intlayer";
    Function Description Related documentation
    intlayer Fastify plugin that integrates Intlayer into your Fastify application. Handles locale detection from storage (cookies, headers), decorates the request object with intlayer data containing t, getIntlayer, and getDictionary, and sets up CLS namespace for programmatic access during the request lifecycle. intlayer

    Functions

    Import:

    import "fastify-intlayer";
    Function Description Related Doc
    t Global translation function that retrieves content for the current locale in Fastify. Utilises CLS (Async Local Storage) and must be used within a request context managed by the intlayer plugin. Can also be accessed via req.intlayer.t. translation
    getIntlayer Retrieves a dictionary by its key from the generated declaration and returns its content for the specified locale. Optimised version of getDictionary. Uses CLS to access request context. Can also be accessed via req.intlayer.getIntlayer. -
    getDictionary Processes dictionary objects and returns content for the specified locale. Processes t() translations, enumerations, Markdown, HTML, etc. Uses CLS to access the request context. It can also be accessed via req.intlayer.getDictionary. -
    Why Intlayer ?