calculate total duration of a youtube playlist by Javascript

total_youtube_playlist_duration_js.js

"use strict";

// dependencies
// npm install axios moment prompt dotenv
const axios = require("axios");
const moment = require("moment");
const prompt = require("prompt");
require("dotenv").config();

// configuration
const key = process.env.YOUTUBE_API_KEY;
const videoApiString = `https://www.googleapis.com/youtube/v3/videos?part=contentDetails&key=${key}`;
const playlistApiString = `https://youtube.googleapis.com/youtube/v3/playlistItems?part=contentDetails&maxResults=50&key=${key}`;

// variables
const videoIdFromPlaylist = [];
const videoIdPromiseArr = [];
const secondsArr = [];

// functions
function timeConverter(totalSeconds) {
    const hours = Math.trunc(totalSeconds / 3600);
    const minutes = Math.trunc((totalSeconds - 3600 * hours) / 60);
    const seconds = Math.trunc(totalSeconds - 3600 * hours - minutes * 60);
    return [hours, minutes, seconds];
}

async function fetchDatafromYtApi(url) {
    try {
        const response = await axios.get(url);
        for (const video of response.data.items) {
            videoIdFromPlaylist.push(video.contentDetails.videoId);
        }
        if (!response.data.nextPageToken) return;
        return await fetchDatafromYtApi(url.concat(`&pageToken=${response.data.nextPageToken}`));
    } catch (error) {
        console.error(error);
    }
}

function fetchVideoInfo() {
    videoIdFromPlaylist.forEach((videoId) => {
        const promiseResult = axios.get(videoApiString.concat(`&id=${videoId}`));
        videoIdPromiseArr.push(promiseResult);
    });
    Promise.all(videoIdPromiseArr).then((resolvedValues) => {
        resolvedValues.forEach((elem) => {
            const rawTime = elem.data.items[0].contentDetails.duration;
            secondsArr.push(moment.duration(rawTime).asSeconds());
        });

        const totalSeconds = secondsArr.reduce((acc, elem) => acc + elem, 0);
        const [hours, minutes, seconds] = timeConverter(totalSeconds);
        console.log(`${hours}h:${minutes}m:${seconds}s`);
    });
}

function promtCallback(err, result) {
    const playlistID = result.playlistURL.split("=")[1];
    if (!playlistID) return;
    fetchDatafromYtApi(playlistApiString.concat(`&playlistId=${playlistID}`)).then(fetchVideoInfo);
}

prompt.start();
prompt.get(["playlistURL"], promtCallback);