feat: Move export functionality to backend for complete database export - Create backend XML service for generating Rekordbox-compatible XML - Add /api/songs/export endpoint that exports entire database - Frontend now calls backend API instead of local function - Exports ALL songs and playlists from database, not just loaded ones - Proper file download with correct headers and filename

packages/backend/src/routes/songs.ts

@@ -195,6 +195,37 @@ router.get('/count', async (req: Request, res: Response) => {
   }
 });
 
+// Export library to XML format
+router.get('/export', async (req: Request, res: Response) => {
+  try {
+    console.log('Exporting library to XML format...');
+    
+    // Get all songs from database
+    const allSongs = await Song.find({}).lean();
+    console.log(`Found ${allSongs.length} songs to export`);
+    
+    // Get all playlists from database
+    const allPlaylists = await Playlist.find({}).lean();
+    console.log(`Found ${allPlaylists.length} playlists to export`);
+    
+    // Import the XML generation function
+    const { exportToXml } = await import('../services/xmlService.js');
+    
+    // Generate XML content
+    const xmlContent = exportToXml(allSongs, allPlaylists);
+    
+    // Set response headers for file download
+    res.setHeader('Content-Type', 'application/xml');
+    res.setHeader('Content-Disposition', `attachment; filename="rekordbox-library-${new Date().toISOString().split('T')[0]}.xml"`);
+    
+    console.log('XML export completed successfully');
+    res.send(xmlContent);
+  } catch (error) {
+    console.error('Error exporting library:', error);
+    res.status(500).json({ message: 'Error exporting library', error });
+  }
+});
+
 // Create multiple songs
 router.post('/batch', async (req: Request, res: Response) => {
   try {

packages/backend/src/services/xmlService.ts

@@ -0,0 +1,86 @@
+import { create } from "xmlbuilder";
+import { Song } from "../models/Song.js";
+import { Playlist } from "../models/Playlist.js";
+
+const buildXmlNode = (node: any): any => {
+  const xmlNode: any = {
+    '@Type': node.type === 'folder' ? '0' : '1',
+    '@Name': node.name,
+  };
+
+  if (node.type === 'folder') {
+    xmlNode['@Count'] = (node.children || []).length;
+    if (node.children && node.children.length > 0) {
+      xmlNode.NODE = node.children.map((child: any) => buildXmlNode(child));
+    }
+  } else {
+    // For playlists, always include KeyType and Entries
+    xmlNode['@KeyType'] = '0';
+    // Set Entries to the actual number of tracks
+    xmlNode['@Entries'] = (node.tracks || []).length;
+    // Include TRACK elements if there are tracks
+    if (node.tracks && node.tracks.length > 0) {
+      xmlNode.TRACK = node.tracks.map((trackId: string) => ({
+        '@Key': trackId
+      }));
+    }
+  }
+
+  return xmlNode;
+};
+
+export const exportToXml = (songs: any[], playlists: any[]): string => {
+  const xml = create({ 
+    DJ_PLAYLISTS: {
+      '@Version': '1.0.0',
+      COLLECTION: {
+        '@Entries': songs.length,
+        TRACK: songs.map(song => ({
+          '@TrackID': song.id,
+          '@Name': song.title,
+          '@Artist': song.artist,
+          '@Composer': song.composer,
+          '@Album': song.album,
+          '@Grouping': song.grouping,
+          '@Genre': song.genre,
+          '@Kind': song.kind,
+          '@Size': song.size,
+          '@TotalTime': song.totalTime,
+          '@DiscNumber': song.discNumber,
+          '@TrackNumber': song.trackNumber,
+          '@Year': song.year,
+          '@AverageBpm': song.averageBpm,
+          '@DateAdded': song.dateAdded,
+          '@BitRate': song.bitRate,
+          '@SampleRate': song.sampleRate,
+          '@Comments': song.comments,
+          '@PlayCount': song.playCount,
+          '@Rating': song.rating,
+          '@Location': song.location,
+          '@Remixer': song.remixer,
+          '@Tonality': song.tonality,
+          '@Label': song.label,
+          '@Mix': song.mix,
+          ...(song.tempo ? {
+            TEMPO: {
+              '@Inizio': song.tempo.inizio,
+              '@Bpm': song.tempo.bpm,
+              '@Metro': song.tempo.metro,
+              '@Battito': song.tempo.battito
+            }
+          } : {})
+        }))
+      },
+      PLAYLISTS: {
+        NODE: {
+          '@Type': '0',
+          '@Name': 'ROOT',
+          '@Count': playlists.length,
+          NODE: playlists.map(playlist => buildXmlNode(playlist))
+        }
+      }
+    }
+  });
+
+  return xml.end({ pretty: true });
+}; 

packages/frontend/src/App.tsx

@@ -9,7 +9,6 @@ import { Configuration } from "./pages/Configuration";
 import { useXmlParser } from "./hooks/useXmlParser";
 import { usePaginatedSongs } from "./hooks/usePaginatedSongs";
 import { formatTotalDuration } from "./utils/formatters";
-import { exportToXml } from "./services/xmlService";
 
 import { api } from "./services/api";
 import type { Song, PlaylistNode } from "./types/interfaces";
@@ -116,10 +115,14 @@ export default function RekordboxReader() {
   } = usePaginatedSongs({ pageSize: 50, playlistName: currentPlaylist });
 
   // Export library to XML
-  const handleExportLibrary = useCallback(() => {
+  const handleExportLibrary = useCallback(async () => {
     try {
-      const xmlContent = exportToXml(songs, playlists);
-      const blob = new Blob([xmlContent], { type: 'application/xml' });
+      const response = await fetch('/api/songs/export');
+      if (!response.ok) {
+        throw new Error('Failed to export library');
+      }
+      
+      const blob = await response.blob();
       const url = URL.createObjectURL(blob);
       const a = document.createElement('a');
       a.href = url;
@@ -131,7 +134,7 @@ export default function RekordboxReader() {
     } catch (error) {
       console.error('Failed to export library:', error);
     }
-  }, [songs, playlists]);
+  }, []);
 
   // Check if database is initialized (has songs or playlists) - moved after useDisclosure
   useEffect(() => {