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NodeJS Express service to convert YouTube url to mp4 url
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| const axios = require('axios'); | |
| const express = require('express'); | |
| // from https://codewithmark.com/learn-to-create-youtube-video-downloader | |
| function qsToJson(qs) { | |
| var res = {}; | |
| var pars = qs.split('&'); | |
| var kv, k, v; | |
| for (i in pars) { | |
| kv = pars[i].split('='); | |
| k = kv[0]; | |
| v = kv[1]; | |
| res[k] = decodeURIComponent(v); | |
| } | |
| return res; | |
| } | |
| // from https://davidwalsh.name/query-string-javascript | |
| function getUrlParameter(search, name) { | |
| name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]'); | |
| var regex = new RegExp('[\\?&]' + name + '=([^&#]*)'); | |
| var results = regex.exec(search); | |
| return results === null ? '' : decodeURIComponent(results[1].replace(/\+/g, ' ')); | |
| }; | |
| async function youTubeVideoInfo(id) { | |
| var url = 'http://www.youtube.com/get_video_info?html5=1&video_id=' + id; | |
| const videoInfoResponse = await axios.get(url); | |
| if (videoInfoResponse.status != 200) { | |
| throw new Error(`YouTube get video info failed: ${videoInfoResponse.status} - ${videoInfoResponse.statusText}`); | |
| } | |
| var get_video_info = qsToJson(videoInfoResponse.data); | |
| // remapping urls into an array of objects | |
| var tmp = get_video_info["url_encoded_fmt_stream_map"]; | |
| if (tmp) { | |
| tmp = tmp.split(','); | |
| for (i in tmp) { | |
| tmp[i] = qsToJson(tmp[i]); | |
| } | |
| get_video_info["url_encoded_fmt_stream_map"] = tmp; | |
| } | |
| return get_video_info; | |
| } | |
| const app = express(); | |
| app.get('/youtube2mp4', async function (req, res) { | |
| res.setHeader('Content-Type', 'application/json'); | |
| if (req.query.url) { | |
| try { | |
| youTubeVideoUrl = req.query.url; | |
| youTubeVideoId = getUrlParameter(youTubeVideoUrl.substring(youTubeVideoUrl.indexOf('?')), 'v'); | |
| const videoInfo = await youTubeVideoInfo(youTubeVideoId); | |
| if (videoInfo.status === 'failed') { | |
| throw(new Error(`Failed due to: ${videoInfo.reason}`)); | |
| } | |
| if (!!videoInfo && !!videoInfo.url_encoded_fmt_stream_map) { | |
| const mp4VideoEntry = videoInfo.url_encoded_fmt_stream_map.find(v => v.type.startsWith('video/mp4')); | |
| if (!mp4VideoEntry) { | |
| throw(new Error(`Failed to resolve mp4 video for ${youTubeVideoUrl}`)); | |
| } | |
| res.send(`{"success":true,"url":"${mp4VideoEntry.url}"}`); | |
| } else { | |
| throw(new Error(`Failed to resolve mp4 video for ${youTubeVideoUrl}`)); | |
| } | |
| } catch(error) { | |
| res.send(`{"success":false,"error":"${error.message}"}`); | |
| } | |
| } else { | |
| res.send(`{"success":false,error:"Url parameter missing"}`); | |
| } | |
| }); | |
| app.listen(9000, () => { | |
| console.log("Server listening on port 9000!"); | |
| }); |
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