Update server.js

server.js

@@ -1,47 +1,48 @@
-import express from "express";
-import multer from "multer";
-import sharp from "sharp";
-import fs from "fs";
-import path from "path";
+import express from 'express';
+import multer from 'multer';
+import sharp from 'sharp';
+import path from 'path';
+import fs from 'fs';
 
 const app = express();
+const port = process.env.PORT || 7860;
+
+// Create /tmp/uploads folder (Hugging Face allows this path)
+const uploadFolder = '/tmp/uploads';
+if (!fs.existsSync(uploadFolder)) {
+    fs.mkdirSync(uploadFolder, { recursive: true });
+}
+
+// Multer storage: keep original name
+const storage = multer.diskStorage({
+    destination: (req, file, cb) => cb(null, uploadFolder),
+    filename: (req, file, cb) => cb(null, file.originalname)
+});
 
-// Use /tmp for uploads (writable on Hugging Face)
-const upload = multer({ dest: "/tmp/uploads" });
+const upload = multer({ storage });
 
-app.post("/convert", upload.single("file"), async (req, res) => {
+// Handle POST upload
+app.post('/convert', upload.single('file'), async (req, res) => {
     try {
-        if (!req.file) {
-            return res.status(400).send("No file uploaded");
-        }
-
-        // Get original name without extension
-        const originalName = path.parse(req.file.originalname).name;
-        const outputFileName = `${originalName}.jpg`;
-        const outputPath = path.join("/tmp", outputFileName);
-
-        // Convert to JPG
-        await sharp(req.file.path)
-            .toFormat("jpeg")
+        const originalFile = req.file;
+        const ext = path.extname(originalFile.originalname);
+        const nameWithoutExt = path.basename(originalFile.originalname, ext);
+        const outputPath = path.join(uploadFolder, `${nameWithoutExt}.png`);
+
+        // Convert to PNG (lossless)
+        await sharp(originalFile.path)
+            .png({ compressionLevel: 0 })
             .toFile(outputPath);
 
-        // Send file directly as download
-        res.setHeader("Content-Type", "image/jpeg");
-        res.setHeader("Content-Disposition", `attachment; filename="${outputFileName}"`);
-
-        const fileStream = fs.createReadStream(outputPath);
-        fileStream.pipe(res);
-
-        fileStream.on("close", () => {
-            fs.unlinkSync(req.file.path);
-            fs.unlinkSync(outputPath);
-        });
-
+        // Send back as file
+        res.setHeader('Content-Disposition', `attachment; filename="${nameWithoutExt}.png"`);
+        res.sendFile(outputPath);
     } catch (error) {
         console.error(error);
-        res.status(500).send("Conversion failed");
+        res.status(500).json({ error: 'Conversion failed' });
     }
 });
 
-const PORT = process.env.PORT || 7860;
-app.listen(PORT, () => console.log(`Server running on port ${PORT}`));
+app.listen(port, () => {
+    console.log(`✅ Server running on port ${port}`);
+});