i try to return data in node.js from a APIs , but I'm having problems, because I need an asynchronous function, I couldn't understand for sure the correct use of the promise, I've tried everything and I couldn't put the result in the return, only in the console.log, somebody help me?
const express = require('express')
const MFA = require('mangadex-full-api')
module.exports = {
async indexManga(req, res) {
const mangalist = MFA.login('DarksGol', 'R@ul1605', './md_cache/').then(async () => {
manga = []
await MFA.Manga.search('Kiss').then(results => {
results.forEach((elem, i) => {
let obj = {}
obj.status = elem.status
obj.title = elem.title
manga.push(obj)
})
}).catch(console.error)
return manga
}).catch(console.error)
console.log(await mangalist)
return mangalist
}
}
no error occurred, only infinite loading on request
const express = require('express')
const routes = express.Router()
const searchManga = require('../src/controllers/searchManga')
routes.get('/searchManga', searchManga.indexManga)
module.exports = routes
I don't see why this would cause "infinite loading on request", but you could greatly simplify the code to just
const express = require('express');
const MFA = require('mangadex-full-api');
module.exports = {
async indexManga(req, res) {
await MFA.login('DarksGol', 'R@ul1605', './md_cache/')
const mangaList = [];
const results = await MFA.Manga.search('Kiss');
results.forEach(elem => {
mangaList.push({
status: elem.status,
title: elem.title,
});
});
return mangalist;
},
};
Looks like indexManga is an endpoint. Each endpoint function must end the request-response cycle by sending a response ( res.send(), res.json(), res.end(), etc). If indexManga s an endpoint, the solution would be:
...
//return mangalist
res.send(mangalist)
or
//return mangalist
res.json({ status: "success", message: "logged in successfully" })
If it is a meddleware:
async indexManga(req, res, next) {
...
//return mangalist
return next()
}
EDIT: you are using async/await with .then() improperly in some places.
Try this way:
module.exports = {
indexManga(req, res) {
MFA.login('DarksGol', 'R@ul1605', './md_cache/').then(() => {
manga = []
MFA.Manga.search('Kiss').then(results => {
results.forEach((elem, i) => {
let obj = {}
obj.status = elem.status
obj.title = elem.title
manga.push(obj)
})
res.json({ status: "success", data: manga })
}).catch((err) => {
res.json({ status: "fail", error: err })
})
}).catch((err) => {
res.json({ status: "fail", error: err })
})
}
}