Overwrite request language using cookie or query parameter. Use with detect-language.

$ npm install --save overwrite-language

var locale = {
  supportedLanguages: ['de', 'fr', 'pl', 'en-GB', 'en-US'],
  defaultLanguage: 'en'
};

app.use(require('overwrite-language')(locale));

Cookie and query parameter name is hl

To set language to German (and to set cookie):

http://example.com?hl=de

Sending empty hl value removes the cookie:

http://example.com?hl

Overwritten language is set in req.lang

MIT © Damian Krzeminski