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SOLVED: Pass data through middleware or router in Express

Maquessime Chevallier:

I am developping a web service and I the server to manage the content negociation in term of language (Accept-Language). I don't know really how we do in Express. But I have done some code :

router.all('/*', (req, res, next) => {
var enFrancais = true
var languagesAsked = req.headers["accept-language"]
languagesAsked = languagesAsked.split(',')
var languages = []
for (var languagesAsked of languagesAsked) {
try {
languages.push({language: languagesAsked.split(";")[0],
pref: languagesAsked.split(";")[1].split("=")[1]})
} catch(err) {
languages.push({ language: languagesAsked, pref: "1"})
_.sortBy(languages, "pref")
if(!languages[0].language.startsWith('fr')) {
enFrancais = false
next() //next(enFrancais) don't works. => ERR 500

router.get('/', (req, res, next) => {
var APIconfiguration = {
version: "0.1",
baseUrl: "/api",
date: new Date(),
responseLanguage: enFrancais

The first router return true if the Accept-Language header of the HTTP header says "I prefer French" or falseif not.

I want in each call of the service that this router (or middleware if it has to be one) manage this HTTP header (to not write this code twice.)

Can I pass the data from the first part to the second part properly ?

Thanks for reading.

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SOLVED: Pass data through middleware or router in Express


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