server.js

import express from "express";
import multer from "multer";
import sharp from "sharp";
import fs from "fs";
import path from "path";

const app = express();
const upload = multer({ dest: "/tmp/uploads" });

app.post("/convert", upload.single("file"), async (req, res) => {
    try {
        if (!req.file) {
            return res.status(400).send("No file uploaded");
        }

        const originalName = path.parse(req.file.originalname).name;
        const outputFileName = `${originalName}.jpg`;
        const outputPath = path.join("/tmp", outputFileName);

        // Convert to JPEG with max quality
        await sharp(req.file.path)
            .jpeg({ quality: 100, chromaSubsampling: "4:4:4" }) // Highest quality possible
            .toFile(outputPath);

        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);
        });

    } catch (error) {
        console.error(error);
        res.status(500).send("Conversion failed");
    }
});

const PORT = process.env.PORT || 7860;
app.listen(PORT, () => console.log(`Server running on port ${PORT}`));