Fetching playlist by id works

src/YTMusic.ts

@@ -318,9 +318,45 @@ export default class YTMusic {
 		return AlbumParser.parse(data, albumId)
 	}
 
-	public async getPlaylist(playlistId: string) {
+	/**
+	 * Get all possible information of a Playlist except the tracks
+	 * 
+	 * @param playlistId Playlist ID
+	 * @returns Playlist Data
+	 */
+	public async getPlaylist(playlistId: string): Promise<YTMusic.PlaylistDetailed> {
+		if (playlistId.startsWith("PL")) playlistId = "VL" + playlistId
 		const data = await this.constructRequest("browse", { browseId: playlistId })
 
-		fs.writeFileSync("data.json", JSON.stringify(data))
+		return PlaylistParser.parse(data, playlistId)
+	}
+
+	/**
+	 * Get all videos in a Playlist
+	 * 
+	 * @param playlistId Playlist ID
+	 * @returns Playlist's Videos
+	 */
+	public async getPlaylistVideos(
+		playlistId: string
+	): Promise<Omit<YTMusic.VideoDetailed, "views">[]> {
+		if (playlistId.startsWith("PL")) playlistId = "VL" + playlistId
+		const playlistData = await this.constructRequest("browse", { browseId: playlistId })
+
+		const songs = traverse(
+			playlistData,
+			"musicPlaylistShelfRenderer",
+			"musicResponsiveListItemRenderer"
+		)
+		let continuation = traverse(playlistData, "musicPlaylistShelfRenderer", "continuation")
+		while (true) {
+			if (continuation instanceof Array) break
+
+			const songsData = await this.constructRequest("browse", {}, { continuation })
+			songs.push(...traverse(songsData, "musicResponsiveListItemRenderer"))
+			continuation = traverse(songsData, "continuation")
+		}
+
+		return songs.map(VideoParser.parsePlaylistVideo)
 	}
 }

src/parsers/PlaylistParser.ts

@@ -1,6 +1,24 @@
 import traverse from "../utils/traverse"
 
 export default class PlaylistParser {
+	public static parse(data: any, playlistId: string): YTMusic.PlaylistDetailed {
+		return {
+			type: "PLAYLIST",
+			playlistId,
+			name: traverse(data, "header", "title", "text").at(0),
+			artist: {
+				artistId: traverse(data, "header", "subtitle", "browseId"),
+				name: traverse(data, "header", "subtitle", "text").at(2)
+			},
+			videoCount: +traverse(data, "header", "secondSubtitle", "text")
+				.at(0)
+				.split(" ")
+				.at(0)
+				.replaceAll(",", ""),
+			thumbnails: traverse(data, "header", "thumbnails")
+		}
+	}
+
 	public static parseSearchResult(item: any): YTMusic.PlaylistDetailed {
 		const flexColumns = traverse(item, "flexColumns")
 		const artistId = traverse(flexColumns[1], "browseId")
@@ -13,7 +31,11 @@ export default class PlaylistParser {
 				artistId: artistId instanceof Array ? null : artistId,
 				name: traverse(flexColumns[1], "runs", "text").at(-2)
 			},
-			songCount: +traverse(flexColumns[1], "runs", "text").at(-1).split(" ").at(0),
+			videoCount: +traverse(flexColumns[1], "runs", "text")
+				.at(-1)
+				.split(" ")
+				.at(0)
+				.replaceAll(",", ""),
 			thumbnails: [traverse(item, "thumbnails")].flat()
 		}
 	}

src/parsers/VideoParser.ts

@@ -4,12 +4,14 @@ import traverse from "../utils/traverse"
 export default class VideoParser {
 	public static parseSearchResult(item: any): YTMusic.VideoDetailed {
 		const flexColumns = traverse(item, "flexColumns")
+		const videoId = traverse(item, "playNavigationEndpoint", "videoId")
 
 		return {
 			type: "VIDEO",
-			videoId: traverse(item, "playNavigationEndpoint", "videoId"),
+			videoId: videoId instanceof Array ? null : videoId,
 			name: traverse(flexColumns[0], "runs", "text"),
-			artists: traverse(flexColumns[1], "runs")
+			artists: [traverse(flexColumns[1], "runs")]
+				.flat()
 				.filter((run: any) => "navigationEndpoint" in run)
 				.map((run: any) => ({ artistId: traverse(run, "browseId"), name: run.text })),
 			views: Parser.parseNumber(traverse(flexColumns[1], "runs", "text").at(-3).slice(0, -6)),
@@ -17,4 +19,21 @@ export default class VideoParser {
 			thumbnails: [traverse(item, "thumbnails")].flat()
 		}
 	}
+
+	public static parsePlaylistVideo(item: any): Omit<YTMusic.VideoDetailed, "views"> {
+		const flexColumns = traverse(item, "flexColumns")
+		const videoId = traverse(item, "playNavigationEndpoint", "videoId")
+
+		return {
+			type: "VIDEO",
+			videoId: videoId instanceof Array ? null : videoId,
+			name: traverse(flexColumns[0], "runs", "text"),
+			artists: [traverse(flexColumns[1], "runs")]
+				.flat()
+				.filter((run: any) => "navigationEndpoint" in run)
+				.map((run: any) => ({ artistId: traverse(run, "browseId"), name: run.text })),
+			duration: Parser.parseDuration(traverse(item, "fixedColumns", "runs", "text")),
+			thumbnails: [traverse(item, "thumbnails")].flat()
+		}
+	}
 }

src/tests/interfaces.ts

@@ -29,7 +29,7 @@ export const SONG_DETAILED: ObjectValidator<YTMusic.SongDetailed> = OBJECT({
 
 export const VIDEO_DETAILED: ObjectValidator<YTMusic.VideoDetailed> = OBJECT({
 	type: STRING("VIDEO"),
-	videoId: STRING(),
+	videoId: OR(STRING(), NULL()),
 	name: STRING(),
 	artists: LIST(ARTIST_BASIC),
 	views: NUMBER(),
@@ -91,6 +91,15 @@ export const PLAYLIST_DETAILED: ObjectValidator<YTMusic.PlaylistDetailed> = OBJE
 	playlistId: STRING(),
 	name: STRING(),
 	artist: ARTIST_BASIC,
-	songCount: NUMBER(),
+	videoCount: NUMBER(),
+	thumbnails: LIST(THUMBNAIL_FULL)
+})
+
+export const PLAYLIST_VIDEO: ObjectValidator<Omit<YTMusic.VideoDetailed, "views">> = OBJECT({
+	type: STRING("VIDEO"),
+	videoId: OR(STRING(), NULL()),
+	name: STRING(),
+	artists: LIST(ARTIST_BASIC),
+	duration: NUMBER(),
 	thumbnails: LIST(THUMBNAIL_FULL)
 })

src/tests/testing.ts

@@ -6,12 +6,13 @@ import {
 	ARTIST_DETAILED,
 	ARTIST_FULL,
 	PLAYLIST_DETAILED,
+	PLAYLIST_VIDEO,
 	SONG_DETAILED,
 	VIDEO_DETAILED
 } from "./interfaces"
 import { LIST, validate } from "validate-any"
 
-const queries = ["Lilac", "Weekend", "Yours Raiden", "Eminem", "IU"]
+const queries = ["Lilac", "Weekend", "Yours Raiden", "Eminem", "Lisa Hannigan"]
 const ytmusic = new YTMusic()
 
 ytmusic.initialize().then(() =>
@@ -25,14 +26,16 @@ ytmusic.initialize().then(() =>
 			ytmusic.search(query)
 		])
 
-		const [artist, artistSongs, artistAlbums, album] = await Promise.all([
+		const [artist, artistSongs, artistAlbums, album, playlist, playlistVideos] =
+			await Promise.all([
 				// ytmusic.getSong(songs[0].videoId),
 				// ytmusic.getVideo(videos[0].videoId),
 				ytmusic.getArtist(artists[0].artistId),
 				ytmusic.getArtistSongs(artists[0].artistId),
 				ytmusic.getArtistAlbums(artists[0].artistId),
-			ytmusic.getAlbum(albums[0].albumId)
+				ytmusic.getAlbum(albums[0].albumId),
-			// ytmusic.getPlaylist(playlists[0].playlistId)
+				ytmusic.getPlaylist(playlists[0].playlistId),
+				ytmusic.getPlaylistVideos(playlists[0].playlistId)
 			])
 
 		const tests: [any, Validator<any>][] = [
@@ -56,8 +59,9 @@ ytmusic.initialize().then(() =>
 			[artist, ARTIST_FULL],
 			[artistSongs, LIST(SONG_DETAILED)],
 			[artistAlbums, LIST(ALBUM_DETAILED)],
-			[album, ALBUM_FULL]
+			[album, ALBUM_FULL],
-			// [playlist, PLAYLIST_DETAILED]
+			[playlist, PLAYLIST_DETAILED],
+			[playlistVideos, LIST(PLAYLIST_VIDEO)]
 		]
 
 		for (const [value, validator] of tests) {

src/types.d.ts

@@ -17,7 +17,7 @@ declare namespace YTMusic {
 
 	interface VideoDetailed {
 		type: "VIDEO"
-		videoId: string
+		videoId: string | null
 		name: string
 		artists: ArtistBasic[]
 		views: number
@@ -66,7 +66,7 @@ declare namespace YTMusic {
 		playlistId: string
 		name: string
 		artist: ArtistBasic
-		songCount: number
+		videoCount: number
 		thumbnails: ThumbnailFull[]
 	}