LinguiJS - Seamless internationalization in Javascript

🌍📖 A readable, automated, and optimized (5 kb) internationalization for JavaScript

Internationalization is the design and development of a product, application or document content that enables easy localization for target audiences that vary in culture, region, or language.

W3C Web Internationalization FAQ

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Key features

Lingui is an easy yet powerful internationalization framework for global projects.

Clean and readable

Keep your code clean and readable, while the library uses battle-tested and powerful ICU MessageFormat under the hood.


Use it everywhere. @lingui/core provides the essential intl functionality which works in any JavaScript project while @lingui/react offers components to leverage React rendering.

Full rich-text support

Use React components inside localized messages without any limitation. Writing rich-text messages is as easy as writing JSX.

Powerful tooling

Manage the whole intl workflow using Lingui CLI. It extracts messages from source code, validates messages coming from translators and checks that all messages are translated before shipping to production.


Integrate Lingui into your existing workflow. It supports message keys as well as auto generated messages. Translations are stored either in JSON or standard PO file, which is supported in almost all translation tools.

Lightweight and optimized

Core library is only 1.9 kB gzipped, React components are additional 3.1 kBs gzipped. That’s less than Redux for a full-featured intl library.

Active community

Join us on Gitter to discuss the latest development. At the moment, Lingui is the most active intl project on GitHub.

Compatible with react-intl

Low-level React API is very similar to react-intl and the message format is the same. It’s easy to migrate existing project.

Quick overview

import * as React from "react"
import { I18n } from "@lingui/react"
import { t, Trans, Plural } from "@lingui/macro"

export default function Lingui({ numUsers, name = "You" }) {
  return (
        {/* Localized messages are simply wrapped in <Trans> */}
        <Trans id="msg.header">Internationalization in React</Trans>

      {/* Element attributes are translated using i18n core object */}
        {({ i18n }) => (
            alt={i18n._(t("image.title")`Logo of Lingui Project`)}

      <p className="lead">
        {/* Variables are passed to messages in the same way as in JSX */}
        <Trans id="msg.lead">
          Hello {name}, LinguiJS is a readable, automated, and optimized (5 kb)
          internationalization for JavaScript.

      {/* Rendering of translation is customizable. Here it renders inside <p> */}
      <Trans render="p" id="">
        {/* Also React Elements inside messages works in the same way as in JSX */}
        Read the <a href="">documentation</a>
        for more info.

        Plurals are managed using ICU plural rules.
        Content of one/other slots is localized using <Trans>.
        Nesting of i18n components is allowed.
        Syntactically valid message in ICU MessageFormat is guaranteed.
            Only <strong>one</strong> user is using this library!
            <strong>{numUsers}</strong> users are using this library!