react node express allowing users to upload profile pictures

Introduction

At 1 time or another when building our Node application we take been faced with uploading a photograph (unremarkably from a grade) to exist used as a contour photo for a user in our app. In addition, we commonly have to shop the photo in the local filesystem (during development) or even in the deject for like shooting fish in a barrel access. Since this is a very common task, there are lots of tools available which nosotros can leverage to handle the private parts of the procedure.

In this tutorial, nosotros will see how to upload a photo and manipulate information technology (resize, crop, greyscale, etc) before writing information technology to storage. Nosotros will limit ourselves to storing files in the local filesystem for simplicity.

Prerequisites

We will exist using the following packages to build our application:

• express: A very popular Node server.
• lodash: A very popular JavaScript library with lots of utility functions for working with arrays, strings, objects and functional programming.
• multer: A package for extracting files from multipart/form-information requests.
• jimp: An image manipulation package.
• dotenv: A package for adding .env variables to procedure.env.
• mkdirp: A package for creating nested directory construction.
• concat-stream: A package for creating a writable stream that concatenates all the data from a stream and calls a callback with the result.
• streamifier: A package to convert a Buffer/Cord into a readable stream.

Project Goals

We desire to take over the uploaded file stream from Multer and so manipulate the stream buffer (paradigm) all the same nosotros wish using Jimp, before writing the image to storage (local filesystem). This will require us to create a custom storage engine to use with Multer — which we will be doing in this tutorial.

Hither is the end effect of what we will exist building in this tutorial:

Pace 1 — Getting Started

Nosotros will brainstorm by creating a new Express app using the Express generator. If you don't have the Limited generator already you will need to install information technology first by running the following command on your command line last:

                      
              
                npm                install                express-generator -g              
            
                  

Once you lot have the Limited generator, you can at present run the following commands to create a new Express app and install the dependencies for Limited. We volition be using ejs as our view engine:

                      
              
limited --view=ejs                photo-uploader-app              
              
                cd                photo-uploader-app              
              
                npm                install              
            
                  

Next, we volition install the remaining dependencies we need for our project:

                      
              
                npm                install                --save lodash multer jimp dotenv concat-stream streamifier mkdirp              
            
                  

Step 2 — Configuring the Basics

Before we keep, our app will demand some course configuration. Nosotros will create a .env file on our projection root directory and add some environs variables. The .env file should wait like the post-obit snippet.

                      AVATAR_FIELD            =            avatar            AVATAR_BASE_URL            =            /uploads/avatars            AVATAR_STORAGE            =            uploads/avatars                  

Next, we will load our environment variables into procedure.env using dotenv then that we tin access them in our app. To practise this, we will add the following line to the app.js file. Ensure y'all add this line at the indicate where you are loading the dependencies. Information technology must come before all route imports and before creating the Express app instance.

app.js

                      var            dotenv            =            require            (            'dotenv'            )            .            config            (            )            ;                  

Now we can access our environment variables using process.env. For case: procedure.env.AVATAR_STORAGE should comprise the value uploads/avatars. We will become alee to edit our index route file routes/index.js to add some local variables we will be needing in our view. We will add ii local variables:

• title: The title of our index page: Upload Avatar
• avatar_field: The name of the input field for our avatar photo. We volition be getting this from process.env.AVATAR_FIELD

Modify the Get / route as follows:

routes/alphabetize.js

          router.            become            (            '/'            ,            function            (            req,              res,              side by side            )            {            res.            render            (            'index'            ,            {            title            :            'Upload Avatar'            ,            avatar_field            :            process.env.            AVATAR_FIELD            }            )            ;            }            )            ;                  

Step 3 — Preparing the View

Permit's begin past creating the basic markup for our photograph upload form past modifying the views/index.ejs file. For the sake of simplicity we will add the styles directly on our view just to give it a slightly overnice look. Come across the post-obit lawmaking for the markup of our page.

views/index.ejs

                                                    <html              class                              =                "no-js"                            >                                                      <caput              >                                                      <meta              charset                              =                "utf-8"                            >                                                      <meta              http-equiv                              =                "X-UA-Compatible"                            content                              =                "IE=edge"                            >                                                      <meta              name                              =                "viewport"                            content                              =                "width=device-width, initial-scale=ane"                            >                                                      <title              >            <%= championship %>                              </title              >                                                      <manner              type                              =                "text/css"                            >                                                      *                {                font                :                600 16px system-ui,                sans-serif;                }                grade                {                width                :                320px;                margin                :                50px auto;                text-align                :                middle;                }                form > legend                {                font-size                :                36px;                color                :                #3c5b6d;                padding                :                150px 0 20px;                }                form > input[blazon=file], class > input[type=file]:before                {                display                :                block;                width                :                240px;                height                :                50px;                margin                :                0 auto;                line-meridian                :                50px;                text-align                :                centre;                cursor                :                arrow;                }                form > input[type=file]                {                position                :                relative;                }                form > input[blazon=file]:before                {                content                :                'Choose a Photo'                ;                position                :                accented;                height                :                -2px;                left                :                -2px;                color                :                #3c5b6d;                font-size                :                18px;                groundwork                :                #fff;                border-radius                :                3px;                edge                :                2px solid #3c5b6d;                }                form > button[type=submit]                {                border-radius                :                3px;                font-size                :                18px;                display                :                block;                border                :                none;                color                :                #fff;                cursor                :                pointer;                background                :                #2a76cd;                width                :                240px;                margin                :                20px motorcar;                padding                :                15px 20px;                }                                                                    </style              >                                                      </head              >                                                      <body              >                                                      <form              activeness                              =                "/upload"                            method                              =                "POST"                            enctype                              =                "multipart/course-information"                            >                                                      <legend              >            Upload Avatar                              </fable              >                                                      <input              type                              =                "file"                            name                              =                "<%= avatar_field %>"                            >                                                      <button              type                              =                "submit"                            class                              =                "btn btn-primary"                            >            Upload                              </button              >                                                      </form              >                                                      </body              >                                                      </html              >                              

Detect how nosotros have used our local variables on our view to set the championship and the name of the avatar input field. You volition notice that we are using enctype="multipart/class-data" on our form since nosotros will be uploading a file. Yous volition also see that we have set the class to brand a Mail request to the /upload route (we will implement later) on submission.

Now let'due south start the app for the first fourth dimension using npm commencement.

                      
              
                npm                start              
            
                  

If you have been post-obit correctly everything should run without errors. Just visit localhost:3000 on your browser. The folio should wait like the following screenshot:

Step 4 — Creating the Multer Storage Engine

Then far, trying to upload a photo through our form will consequence in an error considering we've not created the handler for the upload request. We are going to implement the /upload route to actually handle the upload and nosotros volition be using the Multer package for that. If y'all are not already familiar with the Multer package you lot tin can bank check the Multer packet on Github.

We will accept to create a custom storage engine to use with Multer. Allow'due south create a new binder in our project root named helpers and create a new file AvatarStorage.js within it for our custom storage engine. The file should contain the following blueprint code snippet:

helpers/AvatarStorage.js

                      // Load dependencies            var            _            =            require            (            'lodash'            )            ;            var            fs            =            require            (            'fs'            )            ;            var            path            =            require            (            'path'            )            ;            var            Jimp            =            require            (            'jimp'            )            ;            var            crypto            =            crave            (            'crypto'            )            ;            var            mkdirp            =            require            (            'mkdirp'            )            ;            var            concat            =            crave            (            'concat-stream'            )            ;            var            streamifier            =            crave            (            'streamifier'            )            ;            // Configure UPLOAD_PATH            // process.env.AVATAR_STORAGE contains uploads/avatars            var            UPLOAD_PATH            =            path.            resolve            (__dirname,            '..'            ,            process.env.            AVATAR_STORAGE            )            ;            // create a multer storage engine            var            AvatarStorage            =            function            (            options            )            {            // this serves as a constructor            function            AvatarStorage            (            opts            )            {            }            // this generates a random cryptographic filename            AvatarStorage            .prototype.            _generateRandomFilename            =            function            (            )            {            }            // this creates a Writable stream for a filepath            AvatarStorage            .paradigm.            _createOutputStream            =            function            (            filepath,              cb            )            {            }            // this processes the Jimp image buffer            AvatarStorage            .prototype.            _processImage            =            function            (            image,              cb            )            {            }            // multer requires this for handling the uploaded file            AvatarStorage            .prototype.            _handleFile            =            office            (            req,              file,              cb            )            {            }            // multer requires this for destroying file            AvatarStorage            .prototype.            _removeFile            =            function            (            req,              file,              cb            )            {            }            // create a new example with the passed options and return it            return            new            AvatarStorage            (options)            ;            }            ;            // export the storage engine            module.exports            =            AvatarStorage;                  

Let's begin to add the implementations for the listed functions in our storage engine. Nosotros volition begin with the constructor role.

                      // this serves as a constructor            function            AvatarStorage            (            opts            )            {            var            baseUrl            =            process.env.            AVATAR_BASE_URL            ;            var            allowedStorageSystems            =            [            'local'            ]            ;            var            allowedOutputFormats            =            [            'jpg'            ,            'png'            ]            ;            // fallback for the options            var            defaultOptions            =            {            storage            :            'local'            ,            output            :            'png'            ,            greyscale            :            false            ,            quality            :            seventy            ,            square            :            true            ,            threshold            :            500            ,            responsive            :            false            ,            }            ;            // extend default options with passed options            var            options            =            (opts            &&            _.            isObject            (opts)            )            ?            _.            choice            (opts,            _.            keys            (defaultOptions)            )            :            {            }            ;            options            =            _.            extend            (defaultOptions,            options)            ;            // bank check the options for correct values and use fallback value where necessary            this            .options            =            _.            forIn            (options,            part            (            value,              fundamental,              object            )            {            switch            (key)            {            instance            'square'            :            example            'greyscale'            :            case            'responsive'            :            object[cardinal]            =            _.            isBoolean            (value)            ?            value            :            defaultOptions[key]            ;            break            ;            case            'storage'            :            value            =            String            (value)            .            toLowerCase            (            )            ;            object[central]            =            _.            includes            (allowedStorageSystems,            value)            ?            value            :            defaultOptions[central]            ;            break            ;            example            'output'            :            value            =            Cord            (value)            .            toLowerCase            (            )            ;            object[primal]            =            _.            includes            (allowedOutputFormats,            value)            ?            value            :            defaultOptions[key]            ;            break            ;            example            'quality'            :            value            =            _.            isFinite            (value)            ?            value            :            Number            (value)            ;            object[central]            =            (value            &&            value            >=            0            &&            value            <=            100            )            ?            value            :            defaultOptions[key]            ;            suspension            ;            case            'threshold'            :            value            =            _.            isFinite            (value)            ?            value            :            Number            (value)            ;            object[key]            =            (value            &&            value            >=            0            )            ?            value            :            defaultOptions[key]            ;            pause            ;            }            }            )            ;            // set the upload path            this            .uploadPath            =            this            .options.responsive            ?            path.            bring together            (            UPLOAD_PATH            ,            'responsive'            )            :            UPLOAD_PATH            ;            // set the upload base url            this            .uploadBaseUrl            =            this            .options.responsive            ?            path.            join            (baseUrl,            'responsive'            )            :            baseUrl;            if            (            this            .options.storage            ==            'local'            )            {            // if upload path does non be, create the upload path structure            !fs.            existsSync            (            this            .uploadPath)            &&            mkdirp.            sync            (            this            .uploadPath)            ;            }            }                  

Hither, we divers our constructor function to take a couple of options. Nosotros also added some default (fallback) values for these options in case they are not provided or they are invalid. You lot can tweak this to contain more than options depending on what y'all want, simply for this tutorial we will stick with the following options for our storage engine.

• storage: The storage filesystem. Only allowed value is 'local' for local filesystem. Defaults to 'local'. You can implement other storage filesystems (like Amazon S3) if you wish.
• output: The image output format. Can be 'jpg' or 'png'. Defaults to 'png'.
• greyscale: If fix to true, the output image will exist greyscale. Defaults to false.
• quality: A number between 0: 100 that determines the quality of the output epitome. Defaults to 70.
• foursquare: If gear up to true, the image volition exist cropped to a square. Defaults to false.
• threshold: A number that restricts the smallest dimension (in px) of the output image. The default value is 500. If the smallest dimension of the image exceeds this number, the prototype is resized so that the smallest dimension is equal to the threshold.
• responsive: If fix to true, 3 output images of different sizes (lg, md and sm) will be created and stored in their respective folders. Defaults to fake.

Let's implement the methods for creating the random filenames and the output stream for writing to the files:

                      // this generates a random cryptographic filename            AvatarStorage            .paradigm.            _generateRandomFilename            =            function            (            )            {            // create pseudo random bytes            var            bytes            =            crypto.            pseudoRandomBytes            (            32            )            ;            // create the md5 hash of the random bytes            var            checksum            =            crypto.            createHash            (            'MD5'            )            .            update            (bytes)            .            assimilate            (            'hex'            )            ;            // return as filename the hash with the output extension            return            checksum            +            '.'            +            this            .options.output;            }            ;            // this creates a Writable stream for a filepath            AvatarStorage            .prototype.            _createOutputStream            =            function            (            filepath,              cb            )            {            // create a reference for this to employ in local functions            var            that            =            this            ;            // create a writable stream from the filepath            var            output            =            fs.            createWriteStream            (filepath)            ;            // set callback fn as handler for the error event            output.            on            (            'error'            ,            cb)            ;            // set handler for the finish event            output.            on            (            'stop'            ,            function            (            )            {            cb            (            null            ,            {            destination            :            that.uploadPath,            baseUrl            :            that.uploadBaseUrl,            filename            :            path.            basename            (filepath)            ,            storage            :            that.options.storage            }            )            ;            }            )            ;            // return the output stream            render            output;            }            ;                  

Hither, we use crypto to create a random md5 hash to utilise every bit filename and appended the output from the options equally the file extension. We too defined our helper method to create writable stream from the given filepath and then return the stream. Notice that a callback office is required, since we are using it on the stream event handlers.

Next nosotros will implement the _processImage() method that does the actual epitome processing. Here is the implementation:

                      // this processes the Jimp image buffer            AvatarStorage            .prototype.            _processImage            =            office            (            image,              cb            )            {            // create a reference for this to use in local functions            var            that            =            this            ;            var            batch            =            [            ]            ;            // the responsive sizes            var            sizes            =            [            'lg'            ,            'physician'            ,            'sm'            ]            ;            var            filename            =            this            .            _generateRandomFilename            (            )            ;            var            mime            =            Jimp.            MIME_PNG            ;            // create a clone of the Jimp image            var            clone            =            epitome.            clone            (            )            ;            // fetch the Jimp image dimensions            var            width            =            clone.bitmap.width;            var            height            =            clone.bitmap.height;            var            foursquare            =            Math.            min            (width,            elevation)            ;            var            threshold            =            this            .options.threshold;            // resolve the Jimp output mime type            switch            (            this            .options.output)            {            case            'jpg'            :            mime            =            Jimp.            MIME_JPEG            ;            break            ;            case            'png'            :            default            :            mime            =            Jimp.            MIME_PNG            ;            break            ;            }            // auto scale the image dimensions to fit the threshold requirement            if            (threshold            &&            foursquare            >            threshold)            {            clone            =            (foursquare            ==            width)            ?            clone.            resize            (threshold,            Jimp.            AUTO            )            :            clone.            resize            (Jimp.            Motorcar            ,            threshold)            ;            }            // crop the image to a square if enabled            if            (            this            .options.foursquare)            {            if            (threshold)            {            square            =            Math.            min            (square,            threshold)            ;            }            // fetch the new image dimensions and crop            clone            =            clone.            crop            (            (clone.bitmap.width:            square)            /            two            ,            (clone.bitmap.superlative:            square)            /            ii            ,            square,            foursquare)            ;            }            // convert the image to greyscale if enabled            if            (            this            .options.greyscale)            {            clone            =            clone.            greyscale            (            )            ;            }            // gear up the epitome output quality            clone            =            clone.            quality            (            this            .options.quality)            ;            if            (            this            .options.responsive)            {            // map through the responsive sizes and push them to the batch            batch            =            _.            map            (sizes,            part            (            size            )            {            var            outputStream;            var            epitome            =            goose egg            ;            var            filepath            =            filename.            split            (            '.'            )            ;            // create the complete filepath and create a writable stream for it            filepath            =            filepath[            0            ]            +            '_'            +            size            +            '.'            +            filepath[            ane            ]            ;            filepath            =            path.            bring together            (that.uploadPath,            filepath)            ;            outputStream            =            that.            _createOutputStream            (filepath,            cb)            ;            // scale the image based on the size            switch            (size)            {            case            'sm'            :            image            =            clone.            clone            (            )            .            scale            (            0.3            )            ;            break            ;            case            'md'            :            image            =            clone.            clone            (            )            .            scale            (            0.7            )            ;            break            ;            case            'lg'            :            prototype            =            clone.            clone            (            )            ;            break            ;            }            // render an object of the stream and the Jimp prototype            return            {            stream            :            outputStream,            epitome            :            image            }            ;            }            )            ;            }            else            {            // push an object of the writable stream and Jimp epitome to the batch            batch.            button            (            {            stream            :            that.            _createOutputStream            (path.            join            (that.uploadPath,            filename)            ,            cb)            ,            image            :            clone            }            )            ;            }            // procedure the batch sequence            _.            each            (batch,            part            (            current            )            {            // become the buffer of the Jimp image using the output mime type            electric current.image.            getBuffer            (mime,            function            (            err,              buffer            )            {            if            (that.options.storage            ==            'local'            )            {            // create a read stream from the buffer and pipage it to the output stream            streamifier.            createReadStream            (buffer)            .            piping            (current.stream)            ;            }            }            )            ;            }            )            ;            }            ;                  

A lot is going on in this method merely here is a summary of what it is doing:

• Generates a random filename, resolves the Jimp output image mime type and gets the image dimensions.
• Resize the image if required, based on the threshold requirements to ensure that the smallest dimension does not exceed the threshold.
• Crop the image to a foursquare if enabled in the options.
• Convert the image to greyscale if enabled in the options.
• Set the paradigm output quality from the options.
• If responsive is enabled, the image is cloned and scaled for each of the responsive sizes (lg, physician and sm) and then an output stream is created using the _createOutputStream() method for each image file of the respective sizes. The filename for each size takes the format [random_filename_hash]_[size].[output_extension]. Then the image clone and the stream are put in a batch for processing.
• If responsive is disabled, and then but the electric current image and an output stream for it is put in a batch for processing.
• Finally, each item in the batch is processed by converting the Jimp image buffer into a readable stream using streamifier and so pipage the readable stream to the output stream.

Now we will implement the remaining methods and we will be done with our storage engine.

                      // multer requires this for handling the uploaded file            AvatarStorage            .prototype.            _handleFile            =            office            (            req,              file,              cb            )            {            // create a reference for this to apply in local functions            var            that            =            this            ;            // create a writable stream using concat-stream that will            // concatenate all the buffers written to information technology and pass the            // complete buffer to a callback fn            var            fileManipulate            =            concat            (            part            (            imageData            )            {            // read the image buffer with Jimp            // it returns a promise            Jimp.            read            (imageData)            .            then            (            office            (            image            )            {            // process the Jimp paradigm buffer            that.            _processImage            (image,            cb)            ;            }            )            .            catch            (cb)            ;            }            )            ;            // write the uploaded file buffer to the fileManipulate stream            file.stream.            pipe            (fileManipulate)            ;            }            ;            // multer requires this for destroying file            AvatarStorage            .prototype.            _removeFile            =            function            (            req,              file,              cb            )            {            var            matches,            pathsplit;            var            filename            =            file.filename;            var            _path            =            path.            bring together            (            this            .uploadPath,            filename)            ;            var            paths            =            [            ]            ;            // delete the file properties            delete            file.filename;            delete            file.destination;            delete            file.baseUrl;            delete            file.storage;            // create paths for responsive images            if            (            this            .options.responsive)            {            pathsplit            =            _path.            split            (            '/'            )            ;            matches            =            pathsplit.            pop            (            )            .            match            (                          /              ^(.+?)_.+?\.(.+)$              /              i                        )            ;            if            (matches)            {            paths            =            _.            map            (            [            'lg'            ,            'md'            ,            'sm'            ]            ,            part            (            size            )            {            return            pathsplit.            join            (            '/'            )            +            '/'            +            (matches[            one            ]            +            '_'            +            size            +            '.'            +            matches[            2            ]            )            ;            }            )            ;            }            }            else            {            paths            =            [_path]            ;            }            // delete the files from the filesystem            _.            each            (paths,            office            (            _path            )            {            fs.            unlink            (_path,            cb)            ;            }            )            ;            }            ;                  

Our storage engine is now ready for utilise with Multer.

Step five — Implementing the POST /upload Road

Before we define the route, we will demand to setup Multer for use in our route. Let's go ahead to edit the routes/index.js file to add the post-obit:

routes/index.js

                      var            limited            =            require            (            'express'            )            ;            var            router            =            express.            Router            (            )            ;            /**  * Lawmaking ADDITION  *   * The following lawmaking is added to import additional dependencies  * and setup Multer for employ with the /upload road.  */            // import multer and the AvatarStorage engine            var            _            =            require            (            'lodash'            )            ;            var            path            =            require            (            'path'            )            ;            var            multer            =            require            (            'multer'            )            ;            var            AvatarStorage            =            require            (            '../helpers/AvatarStorage'            )            ;            // setup a new instance of the AvatarStorage engine                        var            storage            =            AvatarStorage            (            {            square            :            true            ,            responsive            :            true            ,            greyscale            :            true            ,            quality            :            90            }            )            ;            var            limits            =            {            files            :            1            ,            // permit only 1 file per asking            fileSize            :            1024            *            1024            ,            // 1 MB (max file size)            }            ;            var            fileFilter            =            part            (            req,              file,              cb            )            {            // supported image file mimetypes            var            allowedMimes            =            [            'epitome/jpeg'            ,            'prototype/pjpeg'            ,            'epitome/png'            ,            'image/gif'            ]            ;            if            (_.            includes            (allowedMimes,            file.mimetype)            )            {            // allow supported image files            cb            (            null            ,            truthful            )            ;            }            else            {            // throw mistake for invalid files            cb            (            new            Error            (            'Invalid file type. But jpg, png and gif image files are allowed.'            )            )            ;            }            }            ;            // setup multer            var            upload            =            multer            (            {            storage            :            storage,            limits            :            limits,            fileFilter            :            fileFilter            }            )            ;            /* CODE Add-on ENDS HERE */                  

Here, we are enabling square cropping, responsive images and setting the threshold for our storage engine. We likewise add limits to our Multer configuration to ensure that the maximum file size is 1 MB and to ensure that non-prototype files are not uploaded.

At present permit's add together the Postal service /upload route as follows:

                      /* routes/index.js */            /**  * CODE ADDITION  *   * The following code is added to configure the POST /upload route  * to upload files using the already defined Multer configuration  */            router.            post            (            '/upload'            ,            upload.            single            (procedure.env.            AVATAR_FIELD            )            ,            function            (            req,              res,              next            )            {            var            files;            var            file            =            req.file.filename;            var            matches            =            file.            friction match            (                          /              ^(.+?)_.+?\.(.+)$              /              i                        )            ;            if            (matches)            {            files            =            _.            map            (            [            'lg'            ,            'md'            ,            'sm'            ]            ,            function            (            size            )            {            return            matches[            1            ]            +            '_'            +            size            +            '.'            +            matches[            ii            ]            ;            }            )            ;            }            else            {            files            =            [file]            ;            }            files            =            _.            map            (files,            office            (            file            )            {            var            port            =            req.app.            get            (            'port'            )            ;            var            base of operations            =            req.protocol            +            '://'            +            req.hostname            +            (port            ?            ':'            +            port            :            ''            )            ;            var            url            =            path.            join            (req.file.baseUrl,            file)            .            replace            (                          /              [\\\/]+              /              g                        ,            '/'            )            .            replace            (                          /              ^[\/]+              /              g                        ,            ''            )            ;            render            (req.file.storage            ==            'local'            ?            base            :            ''            )            +            '/'            +            url;            }            )            ;            res.            json            (            {            images            :            files            }            )            ;            }            )            ;            /* Code Add-on ENDS HERE */                  

Observe how we passed the Multer upload middleware before our road handler. The single() method allows usa to upload only one file that will be stored in req.file. It takes as first parameter, the proper noun of the file input field which we admission from process.env.AVATAR_FIELD.

At present let's starting time the app again using npm outset.

                      
              
                npm                beginning              
            
                  

visit localhost:3000 on your browser and endeavor to upload a photograph. Here is a sample screenshot I got from testing the upload road on Postman using our current configuration options:

You can tweak the configuration options of the storage engine in our Multer setup to get different results.

Conclusion

In this tutorial, we have been able to create a custom storage engine for utilize with Multer which manipulates uploaded images using Jimp and so writes them to storage. For a complete code sample of this tutorial, checkout the advanced-multer-node-sourcecode repository on Github.

aldermanpady1940.blogspot.com

Source: https://www.digitalocean.com/community/tutorials/how-to-add-advanced-photo-uploads-in-node-and-express

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