uploading images in mlab - node.js

Question

currently i am storing images which are uploaded by node rest server in local directory "/uploads" . this is continuously increasing my repo size .
to avoid this , i want to store image files in mongoDB atlas or mlab just like service.
const express = require("express");
const router = express.Router();
const mongoose = require("mongoose");
const multer = require('multer');
const storage = multer.diskStorage({
destination: function(req, file, cb) {
cb(null, './uploads/');
},
filename: function(req, file, cb) {
cb(null, new Date().toISOString() + file.originalname);
}
});
const fileFilter = (req, file, cb) => {
// reject a file
if (file.mimetype === 'image/jpeg' || file.mimetype === 'image/png')
{
cb(null, true);
} else {
cb(null, false);
}
};
const upload = multer({
storage: storage,
limits: {
fileSize: 1024 * 1024 * 5
},
fileFilter: fileFilter
});
Please do help me in this. Thanks in advance.

Answer 1

You can achieve this by using a mongoose Schema and the fs core module to encode the image and unlink the file from /uploads.
I would start by creating a Mongoose Schema to set the model of all information you want to store pertaining to your uploaded file.
I'm going to use base64 encoding for this example.
uploadModel.js
const mongoose = require('mongoose');
const fs = require('fs');
const Schema = mongoose.Schema;
mongoose.set('useCreateIndex', true);
let uploadSchema = new Schema({
name: {
type: String,
},
mimetype: {
type: String,
},
size: {
type: Number,
},
base64: {
type: String,
}
})
module.exports = mongoose.model('upload',uploadSchema);
After setting up a model create a function to base64 encode and module.exports that as well.
To encode your file, use fs.readFileSync(path_to_file, encode_type). After the file has been encoded and saved in a variable you can use fs.unlink(path_to_file) to delete the file out of your /uploads folder.
uploadModel.js
module.exports.base64_encode = function(file) {
return new Promise((resolve, reject) => {
if(file == undefined){
reject('no file found');
} else {
let encodedData = fs.readFileSync(file, 'base64');
fs.unlink(file);
resolve(encodedData.toString('base64'));
}
})
}
Now inside your route file require your model.
route.js
const Upload = require('path_to_uploadModel');
router.post('/path_to_upload', upload.single('form_name_of_file'), (req, res) => {
let img = req.file;
let model = new Upload({
name: img.originalname,
size: img.size,
mimetype: img.mimetype,
})
Upload.base64_encode(img.path)
.then((base64) => {
model['base64'] = base64;
model.save((err)=> {
if(err) throw err;
});
}
})
Hope this helps