NodeJS – use Mongoose to save Files/Images to MongoDB

node

17

mongoose

5

mongodb

42

loveprogramming viết ngày 02/05/2021

https://grokonez.com/node-js/nodejs-use-mongoose-to-save-files-images-to-mongodb

NodeJS – use Mongoose to save Files/Images to MongoDB

In the tutorial, we will show how to build a NodeJS application to save files/images to MongoDB database using Mongoose.

Related posts:

• Crud RestAPIs with NodeJS/Express, MongoDB using Mongoose

Mongoose save files/images to MongoDB

Firstly, we define a Mongoose model for files/images with Buffer data as below:

const ImageSchema = mongoose.Schema({
    type: String,
    data: Buffer
});

To read/write data of file/image, we use fs.readFileSync('/path/to/file') and fs.writeFileSync('/path/to/file', image.data) functions of NodeJS file-system module.

Below segment code is used to store file/image to MongoDB:

// Connecting to the database
mongoose.connect(dbConfig.url)
.then(() => {
    
    // empty the collection
    Image.remove(err => {
        if (err) throw err;
        console.log("Removed all documents in 'images' collection.");
        var imageData = fs.readFileSync('/path/to/file');
        
        // Create an Image instance
        const image = new Image({
            type: 'image/png',
            data: imageData
        });

        // Store the Image to the MongoDB
        image.save()
        .then(img => {
            // Find the stored image in MongoDB, then save it in a folder
            Image.findById(img, (err, findOutImage) => {
                if (err) throw err;
                try{
                    fs.writeFileSync('/path/to/file', findOutImage.data);
                }catch(e){
                    console.log(e);
                }
            });
        });
    })
    
})

Practice

We build a NodeJS project as below structure:

More at:

https://grokonez.com/node-js/nodejs-use-mongoose-to-save-files-images-to-mongodb

NodeJS – use Mongoose to save Files/Images to MongoDB