Node.js web frameworks like express or Fastify and also for Deno

Node.js web frameworks like express or Fastify and also for Deno

This is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno.i18next-http-middleware is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno.

Introduction

This is a middleware to be used with Node.js web frameworks like express or Fastify and also for Deno.

It's based on the deprecated i18next-express-middleware and can be used as a drop-in replacement. It's not bound to a specific http framework anymore.

Getting started

# npm package
$ npm install i18next-http-middleware

wire up i18next to request object

var i18next = require('i18next')
var middleware = require('i18next-http-middleware')
var express = require('express')

i18next.use(middleware.LanguageDetector).init({
  preload: ['en', 'de', 'it'],
  ...otherOptions
})

var app = express()
app.use(
  middleware.handle(i18next, {
    ignoreRoutes: ['/foo'] // or function(req, res, options, i18next) { /* return true to ignore */ }
  })
)

// in your request handler
app.get('myRoute', (req, res) => {
  var lng = req.language // 'de-CH'
  var lngs = req.languages // ['de-CH', 'de', 'en']
  req.i18n.changeLanguage('en') // will not load that!!! assert it was preloaded

  var exists = req.i18n.exists('myKey')
  var translation = req.t('myKey')
})

// in your views, eg. in pug (ex. jade)
div = t('myKey')

Fastify usage

var i18next = require('i18next')
var middleware = require('i18next-http-middleware')
var fastify = require('fastify')

i18next.use(middleware.LanguageDetector).init({
  preload: ['en', 'de', 'it'],
  ...otherOptions
})

var app = fastify()
app.register(i18nextMiddleware.plugin, {
  i18next,
  ignoreRoutes: ['/foo'] // or function(req, res, options, i18next) { /* return true to ignore */ }
})
// or
// app.addHook('preHandler', i18nextMiddleware.handle(i18next, {
//   ignoreRoutes: ['/foo'] // or function(req, res, options, i18next) { /* return true to ignore */ }
// }))

// in your request handler
app.get('myRoute', (request, reply) => {
  var lng = request.language // 'de-CH'
  var lngs = v.languages // ['de-CH', 'de', 'en']
  request.i18n.changeLanguage('en') // will not load that!!! assert it was preloaded

  var exists = request.i18n.exists('myKey')
  var translation = request.t('myKey')
})

Demo usage

abc

import i18next from 'https://deno.land/x/i18next/index.js'
import Backend from 'https://cdn.jsdelivr.net/gh/i18next/i18next-fs-backend/index.js'
import i18nextMiddleware from 'https://deno.land/x/i18next_http_middleware/index.js'
import { Application } from 'https://deno.land/x/abc/mod.ts'
import { config } from "https://deno.land/x/dotenv/dotenv.ts";

i18next
  .use(Backend)
  .use(i18nextMiddleware.LanguageDetector)
  .init({
    // debug: true,
    backend: {
      // eslint-disable-next-line no-path-concat
      loadPath: 'locales/{{lng}}/{{ns}}.json',
      // eslint-disable-next-line no-path-concat
      addPath: 'locales/{{lng}}/{{ns}}.missing.json'
    },
    fallbackLng: 'en',
    preload: ['en', 'de']
  })

const port = config.PORT || 8080
const app = new Application()
const handle = i18nextMiddleware.handle(i18next)
app.use((next) =>
  (c) => {
    handle(c.request, c.response, () => {})
    return next(c)
  }
)
app.get('/', (c) => c.request.t('home.title'))
await app.start({ port })

ServestJS

import i18next from 'https://deno.land/x/i18next/index.js'
import Backend from 'https://cdn.jsdelivr.net/gh/i18next/i18next-fs-backend/index.js'
import i18nextMiddleware from 'https://deno.land/x/i18next_http_middleware/index.js'
import { createApp } from 'https://servestjs.org/@v1.0.0-rc2/mod.ts'
import { config } from "https://deno.land/x/dotenv/dotenv.ts";

i18next
  .use(Backend)
  .use(i18nextMiddleware.LanguageDetector)
  .init({
    // debug: true,
    backend: {
      // eslint-disable-next-line no-path-concat
      loadPath: 'locales/{{lng}}/{{ns}}.json',
      // eslint-disable-next-line no-path-concat
      addPath: 'locales/{{lng}}/{{ns}}.missing.json'
    },
    fallbackLng: 'en',
    preload: ['en', 'de']
  })

const port = config.PORT || 8080
const app = createApp()
app.use(i18nextMiddleware.handle(i18next))
app.get('/', async (req) => {
  await req.respond({
    status: 200,
    headers: new Headers({
      'content-type': 'text/plain',
    }),
    body: req.t('home.title')
  })
})
await app.listen({ port })

add routes

// missing keys make sure the body is parsed (i.e. with [body-parser](https://github.com/expressjs/body-parser#bodyparserjsonoptions))
app.post('/locales/add/:lng/:ns', middleware.missingKeyHandler(i18next))

// multiload backend route
app.get('/locales/resources.json', middleware.getResourcesHandler(i18next))

add localized routes

You can add your routes directly to the express app

var express = require('express'),
  app = express(),
  i18next = require('i18next'),
  FilesystemBackend = require('i18next-fs-backend'),
  i18nextMiddleware = require('i18next-http-middleware'),
  port = 3000

i18next
  .use(i18nextMiddleware.LanguageDetector)
  .use(FilesystemBackend)
  .init({ preload: ['en', 'de', 'it'], ...otherOptions }, () => {
    i18nextMiddleware.addRoute(
      i18next,
      '/:lng/key-to-translate',
      ['en', 'de', 'it'],
      app,
      'get',
      (req, res) => {
        //endpoint function
      }
    )
  })
app.use(i18nextMiddleware.handle(i18next))
app.listen(port, () => {
  console.log('Server listening on port', port)
})

or to an express router

var express = require('express'),
  app = express(),
  i18next = require('i18next'),
  FilesystemBackend = require('i18next-fs-backend'),
  i18nextMiddleware = require('i18next-http-middleware'),
  router = require('express').Router(),
  port = 3000

i18next
  .use(i18nextMiddleware.LanguageDetector)
  .use(FilesystemBackend)
  .init({ preload: ['en', 'de', 'it'], ...otherOptions }, () => {
    i18nextMiddleware.addRoute(
      i18next,
      '/:lng/key-to-translate',
      ['en', 'de', 'it'],
      router,
      'get',
      (req, res) => {
        //endpoint function
      }
    )
    app.use('/', router)
  })
app.use(i18nextMiddleware.handle(i18next))
app.listen(port, () => {
  console.log('Server listening on port', port)
})

custom http server

Define your own functions to handle your custom request or response

middleware.handle(i18next, {
  getPath: (req) => req.path,
  getUrl: (req) => req.url,
  setUrl: (req, url) => req.url = url,
  getQuery: (req) => req.query,
  getParams: (req) => req.params,
  getBody: (req) => req.body,
  setHeader: (res, name, value) => res.setHeader(name, value),
  setContentType: (res, type) => res.contentType(type),
  setStatus: (res, code) => res.status(code),
  send: (res, body) => res.send(body)
})

language detection

Detects user language from current request. Comes with support for:

  • path
  • cookie
  • header
  • querystring
  • session

Wiring up:

var i18next = require('i18next')
var middleware = require('i18next-http-middleware')

i18next.use(middleware.LanguageDetector).init(i18nextOptions)

As with all modules you can either pass the constructor function (class) to the i18next.use or a concrete instance.

Detector Options

{
  // order and from where user language should be detected
  order: [/*'path', 'session', */ 'querystring', 'cookie', 'header'],

  // keys or params to lookup language from
  lookupQuerystring: 'lng',
  lookupCookie: 'i18next',
  lookupHeader: 'accept-language',
  lookupHeaderRegex: /(([a-z]{2})-?([A-Z]{2})?)\s*;?\s*(q=([0-9.]+))?/gi,
  lookupSession: 'lng',
  lookupPath: 'lng',
  lookupFromPathIndex: 0,

  // cache user language
  caches: false, // ['cookie']

  // optional expire and domain for set cookie
  cookieExpirationDate: new Date(),
  cookieDomain: 'myDomain',
  cookiePath: '/my/path',
  cookieSecure: true, // if need secure cookie
  cookieSameSite: 'strict' // 'strict', 'lax' or 'none'
}

Options can be passed in:

preferred - by setting options.detection in i18next.init:

var i18next = require('i18next')
var middleware = require('i18next-http-middleware')

i18next.use(middleware.LanguageDetector).init({
  detection: options
})

on construction:

var middleware = require('i18next-http-middleware')
var lngDetector = new middleware.LanguageDetector(null, options)

via calling init:

var middleware = require('i18next-http-middleware')

var lngDetector = new middleware.LanguageDetector()
lngDetector.init(options)

Adding own detection functionality

interface

module.exports = {
  name: 'myDetectorsName',

  lookup: function(req, res, options) {
    // options -> are passed in options
    return 'en'
  },

  cacheUserLanguage: function(req, res, lng, options) {
    // options -> are passed in options
    // lng -> current language, will be called after init and on changeLanguage

    // store it
  }
}

adding it

var i18next = require('i18next')
var middleware = require('i18next-http-middleware')

var lngDetector = new middleware.LanguageDetector()
lngDetector.addDetector(myDetector)

i18next.use(lngDetector).init({
  detection: options
})

Download Details:

Author: i18next

GitHub: https://github.com/i18next/i18next-http-middleware

nodejs node javascript deno

What is Geek Coin

What is GeekCash, Geek Token

Best Visual Studio Code Themes of 2021

Bootstrap 5 Tutorial - Bootstrap 5 Crash Course for Beginners

Nest.JS Tutorial for Beginners

Hello Vue 3: A First Look at Vue 3 and the Composition API

AEM Querybuilder for JavaScript (Browser, Node, Deno)

Helix Querybuilder .AEM Querybuilder for JavaScript (Browser, Node, Deno)

NKeys for JavaScript - Node.js, Browsers, and Deno

A public-key signature system based on Ed25519 for the NATS ecosystem system for JavaScript. The nkeys.js library works in Deno, Node.js, and the browser!

Javascript module for easily generating mazes,compatible with both Deno and Node

A work-in-progress Javascript maze generator module, compatible with both Deno and Node.

Deno Tutorial for Beginners: Deno vs. Node: Better Than NodeJS?

Deno is released, it’s time to find out if it can prove a worthy competition for Node.js. What is Deno? Why Deno can be considered an alternative to Node? The main differences between Deno and Node. Write a simple Deno app.

What is Deno? The Node.JS Killer? The Deno-minator to Node?

What is Deno? The Node.JS Killer? The Deno-minator to Node? Deno is the new hype and will it be better than node.js? Deno is a secure runtime for JavaScript and TypeScript that is based on the V8 JavaScript engine and the Rust programming language that addresses Node’s shortcomings