Return from module is undefined - node.js

Question

Hi I made a module and when I try to return the song name it is just undefined, the console.log just before it works though so I'm a little confused. The line after console.log(`"${songName}" by ${artistsList}`) is where the issue is, I try to return "${songName}" by ${artistsList} but the return is just undefined so I am a little stuck on why
Code: (This is the spotify.js module)
I call it with const Spotify = require("./spotify.js"), everything works up until I need to just return the song name using the Spotify.request() function
const axios = require("axios");
module.exports = {
token: "",
ref: "",
refresh: function () {
axios({
method: "post", //you can set what request you want to be
url: "https://accounts.spotify.com/api/token",
data:
`grant_type=refresh_token&refresh_token=${this.ref}`,
headers: {
Authorization:
"Basic ",
"Content-Type": "application/x-www-form-urlencoded"
}
}).then(response => {
this.token = response.data.access_token
console.log(`Successfully refreshed token ${module.exports.token}`);
});
},
analyseSong: function (data) {
console.log(data)
const x = data;
//console.log(x)
if (x.is_playing) {
const songNameMatch = x.item.name.split("(");
var songName = x.item.name;
try {
const letter = songNameMatch[1].charAt(0);
letter.toLowerCase() == "f" ||
songNameMatch[1].toLowerCase().match(/^with/)
? (songName = songNameMatch[0].trim())
: false;
} catch (err) {
false;
}
var artistArray = [];
var artist;
const artists = x.item.artists;
//console.log(token)
for (artist in artists) {
artistArray.push(x.item.artists[artist].name);
}
//console.log(artistArray)
const artistsList = artistArray.join(", ");
//console.log(artistsList)
//console.log(`Currently playing: ${songName} - ${artistsList}`);
console.log(`"${songName}" by ${artistsList}`)
return `"${songName}" by ${artistsList}`;
} else {
return `Not currently listening to a song`;
}
},
request: function () {
axios
.get("https://api.spotify.com/v1/me/player/currently-playing", {
headers: { Authorization: `Bearer ${this.token}` }
})
.then(function (response) {
module.exports.analyseSong(response.data);
})
},
}

Answer 1

So I'm doing X=Spotify.request() trying to get the song name as X so I can output using IRC chat
There are a couple problems. .request() has no return value at all. So, it will never return anything other than undefined. You can fix that like this by adding two return statements, the first to return the promise itself and the second to make the return value from analyseSong() be the resolved value of that promise:
request: function () {
return axios
.get("https://api.spotify.com/v1/me/player/currently-playing", {
headers: { Authorization: `Bearer ${this.token}` }
})
.then(function (response) {
return module.exports.analyseSong(response.data);
})
},
Now Spotify.request() will return a promise that will resolve with the value returned from .analyseSong(response.data). You would use that promise like this:
Spotify.request().then(result => {
console.log(result);
}).catch(err => {
console.log(err);
});