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August 9, 2019 11:12
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Internationalization and localization example using express + i18n and nunjucks
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| // usual requirements | |
| const express = require('express'); | |
| const cookieParser = require('cookie-parser'); | |
| const i18n = require('i18n'); | |
| const nunjucks = require('nunjucks'); | |
| const app = module.exports = express(); | |
| i18n.configure({ | |
| // setup some locales - other locales default to en silently | |
| locales: ['en', 'fr', 'de', 'ru'], | |
| queryParameter: "lang", | |
| // sets a custom cookie name to parse locale settings from | |
| cookie: 'lang_cookie_name', | |
| // where to store json files - defaults to './locales' | |
| directory: __dirname + '/locales' | |
| }); | |
| // set default express engine and extension | |
| app.engine('html', nunjucks.render); | |
| app.set('view engine', 'njk'); | |
| // you will need to use cookieParser to expose cookies to req.cookies | |
| app.use(cookieParser()); | |
| // i18n init parses req for language headers, cookies, etc. | |
| app.use(i18n.init); | |
| // configure nunjucks environment | |
| const env = nunjucks.configure('views', { | |
| express: app //integrate nunjucks into express | |
| }); | |
| env.addGlobal("__", i18n.__); | |
| env.addFilter("t", i18n.__); | |
| // serving homepage | |
| app.get('/', function (req, res) { | |
| const templateData = { | |
| date: new Date() | |
| }; | |
| res.render('home', {templateData}); | |
| }); | |
| // starting server | |
| app.listen(3000); |
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| // Put into separate json files inside ./locales folder | |
| // locales/de.json | |
| { | |
| "home.title": "Dies ist die Homepage", | |
| "home.p": "Bitte wählen Sie Ihre Sprache", | |
| "lng.english": "Englisch", | |
| "lng.french": "Französisch", | |
| "lng.german": "Deutsche", | |
| "lng.rus": "Russisch" | |
| } | |
| // locales/en.json | |
| { | |
| "home.title": "This is home page", | |
| "home.p": "Select the language", | |
| "lng.english": "English", | |
| "lng.french": "French", | |
| "lng.german": "German", | |
| "lng.rus": "Russian", | |
| "server.date": "<small>Server time: {{ date }}</small>" | |
| } | |
| // locales/fr.json | |
| { | |
| "home.title": "C'est la page d'accueil", | |
| "home.p": "Choisissez la langue", | |
| "lng.english": "Anglaise", | |
| "lng.french": "Française", | |
| "lng.german": "Allemande", | |
| "lng.rus": "Russe" | |
| } | |
| // locales/ru.json | |
| { | |
| "home.title": "Это домашняя страница", | |
| "home.p": "Выберите язык", | |
| "lng.english": "Английский", | |
| "lng.french": "Французский", | |
| "lng.german": "Немецкий", | |
| "lng.rus": "Русский" | |
| } |
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| { | |
| "name": "express-i18n-nunjucks-gist", | |
| "description": "Example gist for how to setup the express 4, i18n and nunjucks", | |
| "version": "1.0.0", | |
| "scripts": { | |
| "start": "node express_i18n_nunjucks.js" | |
| }, | |
| "engines": { | |
| "node": ">=10.15" | |
| }, | |
| "engineStrict": true, | |
| "dependencies": { | |
| "cookie-parser": "^1.4.4", | |
| "express": "^4.17.1", | |
| "i18n": "^0.8.3", | |
| "nunjucks": "^3.2.0" | |
| }, | |
| "devDependencies": {} | |
| } |
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| <!-- Put into the ./views folder --> | |
| <!-- views/home.njk --> | |
| {% extends "layout.njk" %} | |
| {% block title %}{{ __('home.title') }}{% endblock %} | |
| {% block content %} | |
| <h1>{{ __('home.title') }}</h1> | |
| <p>{{ __('home.p') }}</p> | |
| <p>{{ 'server.date' | t(templateData) | safe }}</p> | |
| <a href="?lang=en">{{ 'lng.english' | t }}</a> | |
| <a href="?lang=fr">{{ __('lng.french') }}</a> | |
| <a href="?lang=de">{{ __('lng.german') }}</a> | |
| <a href="?lang=ru">{{ __('lng.rus') }}</a> | |
| {% endblock %} | |
| <!-- views/layout.njk --> | |
| <html> | |
| <head> | |
| <title>{% block title %}{% endblock %}</title> | |
| <meta charset="utf8"/> | |
| <meta name="viewport" content="width=device-width"/> | |
| </head> | |
| <body>{% block content %} {% endblock %}</body> | |
| </html> |
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