How to download images from the database? - node.js

Question

I need to upload files and images no larger than 2 megabytes in the database. But there is a problem downloading images. All images that are downloaded break and do not open. No such problems with text files.
Result of the downloaded image:
file 2.png
2.png: data
Uploading images this way:
module.exports.upload = async function (req, res) {
const sysFileObj = {
COMMENTS: req.body.COMMENTS,
NAME: req.file.originalname,
MIMETYPE: req.file.mimetype,
FILE_CONTENT: req.file.buffer
};
try {
await SysFiles.create(sysFileObj);
res.status(201).json(sysFileObj);
} catch (e) {
errorHandler(res, e);
}
};
multer:
const multer = require('multer');
const storage = multer.memoryStorage()
let obj = {
storage: storage,
limits: {
fileSize: 1024 * 1024 * 2
}
};
var upload = multer(obj)
module.exports = upload;
And here there is a problem when download:
module.exports.download = async function (req, res) {
try {
let sysFile = await SysFiles.findById(req.params.SYSFILE_ID);
var fileContents = Buffer.from(sysFile._props.FILE_CONTENT);
var readStream = new stream.PassThrough();
readStream.end(fileContents);
res.set('Content-disposition', 'attachment; filename=' + sysFile._props.NAME);
res.set('Content-Type', sysFile._props.MIMETYPE);
readStream.pipe(res);
} catch (e) {
errorHandler(res, e);
}
};
What am I doing wrong? Please tell me. I must say right away that I need to upload the image to the database without any links to any folder where the images will be stored.
Note:
But, by the way, when I downloaded the uploaded image using “SQL
Developer”, the image opens without any not problems.

Answer 1

You must store image content-Type
And image data
const formidable = require('formidable');
const _ = require('lodash');
const fs = require('fs');
// loading formidable library
let form = new formidable.IncomingForm();
// taking file extension
form.keepExtensions = true;
//processing for upload image
form.parse(request_data,(err,fields,files) => {
//if error when uploading image
if (err) {
return res.status(400).json({
err: 'Image could not bd uploaded'
})
}
// validating all fields without image
const {name, description, price, category, quantity, shipping} = fields;
if(!name || !description || !price || !category || !quantity || !shipping) {
return res.status(400).json({
err: 'All Fields are required'
})
}
// lets continue when there are no error
// form have available photo
if(files.photo){
//1 kb = 1000
//1 MB = 1000000
// check image size
if(files.photo.size > 2000000){
return res.status(400).json({
err: 'Image should be less than 2 MB'
})
}
// there are no error found then execute it
TAKING_AS_YOUR_VALRIABLE.data = fs.readFileSync(files.photo.path);
TAKING_AS_YOUR_VALRIABLE.contentType = files.photo.type
}
// finaly save product
//save it your own way
const FINAL_DATA = {...fields,...TAKING_AS_YOUR_VALRIABLE}
})
now show photo code
if(TAKING_AS_YOUR_VALRIABLE.data){
res.set('Content-Type',TAKING_AS_YOUR_VALRIABLE.contentType);
res.send(TAKING_AS_YOUR_VALRIABLE.data);
}