I’m encountering an error when I try to upload an image to my server running at http://localhost:8080/upload.This error only occurs when I use the diskStorage() function from Multer to specify a destination for the uploaded files.

For some reason, using the simpler multer({dest: './uploads'}) configuration works without any issues. I’d like to understand why diskStorage() is causing this error.

Error:

Error: ENOENT: no such file or directory, open 'uploads/file-1720419517466-949551950'

Code:

const express = require("express");
const multer = require("multer");

const storage = multer.diskStorage({
    destination: function (req, file, cb) {
        cb(null, './uploads');
    },
    filename: function (req, file, cb) {
        const uniqueSuffix = Date.now() + '-' + Math.round(Math.random() * 1E9);
        cb(null, file.fieldname + '-' + uniqueSuffix);
    }
});

const upload = multer({storage: storage});

const app = express();

app.get("/", (req, res) => {
    res.send(`
        <h1>OK</h1>
    `);
});

app.post("/upload", upload.single("file"), (req, res) => {
    res.json({
        data: "Upload successful"
    });
});

app.listen(8080, () => {
    console.log("listening on port 8080...");
});