@abdurrahmanabid/multi-file-upload/dist/index.esm.js

"A simple middleware for handling single and multiple file uploads with customizable file types and directories."

import multer from 'multer';
import fs from 'fs';

/**
 * File upload middleware.
 * @param uploadType - 'single' or 'multiple' (default: 'single')
 * @param acceptedTypes - Array of allowed file MIME types (default: all)
 * @param directory - Upload directory (default: 'uploads/')
 * @param fieldName - The field name for file input (default: 'file')
 */
const uploadHandler = (uploadType = 'single', acceptedTypes = [], directory = 'uploads/', fieldName = 'file') => {
    // Ensure the directory exists
    if (!fs.existsSync(directory)) {
        fs.mkdirSync(directory, { recursive: true });
    }
    // Configure multer storage
    const storage = multer.diskStorage({
        destination: (req, file, cb) => {
            cb(null, directory);
        },
        filename: (req, file, cb) => {
            const filename = `${Date.now()}-${file.originalname}`;
            cb(null, filename);
        }
    });
    // Multer filter for accepted file types
    const fileFilter = (req, file, cb) => {
        if (acceptedTypes.length > 0 && !acceptedTypes.includes(file.mimetype)) {
            return cb(new Error("Invalid file type"), false);
        }
        cb(null, true);
    };
    const upload = multer({
        storage,
        fileFilter
    });
    // Choose single or multiple upload
    const uploadMiddleware = uploadType === "multiple"
        ? upload.array(fieldName, 10) // Allow up to 10 files
        : upload.single(fieldName);
    // Return middleware with automatic response handling
    return (req, res, next) => {
        uploadMiddleware(req, res, (err) => {
            if (err) {
                return res.status(400).json({ error: err.message });
            }
            if (!req.files && !req.file) {
                res.status(404).json({
                    message: "Files NOT FOUND",
                });
                return;
            }
            res.status(200).json({
                message: "Files uploaded successfully",
                files: req.files
                    ? Array.isArray(req.files)
                        ? req.files.map((file) => ({ ...file, path: file.path.replace(/\\/g, "/") }))
                        : req.files
                    : req.file
                        ? { ...req.file, path: req.file.path.replace(/\\/g, "/") }
                        : undefined
            });
        });
    };
};

export { uploadHandler as default };