koa-i18next-middleware/index.js

An i18next middleware for koa2 framework.

const Koa = require('koa')
const i18next = require('i18next')
const app = new Koa()
import LD from 'koa-i18next-detector'

const i18m = require('./src')

i18next.use(LD).init(
  {
    fallbackLng: 'en',
    preload: ['en', 'es'],
    resources: {
      en: {
        translation: {
          key: 'hello world'
        }
      },
      es: {
        translation: {
          key: 'es hello world es'
        }
      }
    },
    detection: {
      order: ['querystring', /*'path', 'cookie',*/ 'header', 'session'],

      lookupQuerystring: 'lng',

      lookupParam: 'lng', // for route like: 'path1/:lng/result'
      lookupFromPathIndex: 0,

      lookupCookie: 'i18next',
      // cookieExpirationDate: new Date(), // default: +1 year
      // cookieDomain: '', // default: current domain.

      lookupSession: 'lng',

      // cache user language
      caches: false // ['cookie']
    }
  },
  (err, t) => {
    // initialized and ready to go!
    const hw = i18next.t('key') // hw = 'hello world'
    console.log(hw)
  }
)

app.use(
  i18m.getHandler(i18next, {
    locals: 'locals',
    ignoreRoutes: ['/no-lng-route']
  })
)

// response
app.use(async (ctx, next) => {
  await next()
  if (ctx.request.lng) {
    ctx.body = ctx.response.locals.t(`key`)
  } else {
    ctx.body = 'No language detected!'
  }
})

app.listen(3000, function() {
  console.log('server listening')
})