Every project requires file storage capabilities, such as storing images, PDFs, CSVs, XLS files, and other assets in the cloud. I utilize DigitalOcean Spaces, which operates using the AWS S3 SDK. Let me demonstrate how to create an API endpoint for uploading assets.

1. Setup API route in server.js and create a file bucketRoutes.js in routes folder.

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// Import the route file on the top
const bucketRoutes = require('./app/routes/bucketRoutes');

// bind the bucketRoutes to **/bucket** path
app.use('/bucket', bucketRoutes);

2. bucketRoutes.js file looks like this.

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// app/routes/bucketRoutes.js
const express = require('express');
const router = express.Router();
const bucketController = require('../controllers/bucketController');

router.post('/upload', bucketController.uploadFile);

module.exports = router;

3. Create bucketController.js file in the controllers folder.

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// app/controllers/bucketController.js
const { responseList } = require('../errors/responseList');
const path = require('path');
const { slugify } = require('../helpers/functions');
const s3 = require('../clients/s3');

exports.uploadFile = async function (req, res, next) {
    const { acl, folderName } = req.body;
    try {
        const [key, value] = Object.entries(req.files)[0];

        const fileExt = path.extname(value.name);
        let pathWhereFileWillStore = `${slugify(value.name)}${fileExt}`;

        if (folderName) {
            pathWhereFileWillStore = `${folderName}/${slugify(value.name)}${fileExt}`;
        }

        let params = {
            Bucket: process.env.SPACE_BUCKET_NAME,
            Body: value.data,
            Key: pathWhereFileWillStore,
            ACL: 'public-read',
            ContentType: value.mimetype,
        };

        if (acl) params.ACL = acl;

        s3.upload(params, async function (err, data) {
            if (err) return res.status(500).send(responseList(500, err.message));

            res.send(data);
        });
    } catch (error) {
        res.status(400).send(responseList(400, error.message));
    }
};