I have read a lot of examples/tutorials on internet that explain how to upload and store files in PostgreSQL using NodeJS, Multer, Sequelize, Express, ...
With none of them I have understood how to do it in my project.
I have an Angular app where I have an input file, I have an API in NodeJS using pg-promise to link with my PostgreSQL database. I have done all my project api with pg-promise so I would like to use it and no Sequelize.
In the database I have read that the best is probably the BYTEA type for files like jpg, png, pdf, docx...
Here is my API hierarchy :
www file contains code to initiate the server
app.js file contains code to initiate express app and the require([library]) of what I need
index.js file contains code to link urls to function that are stored in queries.js
The only thing I want is How to store a file.
Thanks if you can help me
I strongly recommend you the use of multer library. It helps you with the storage of files in disk. You get the path where it is stored, and you could save the path on the database.
https://github.com/expressjs/multer
Related
I have a Node.js backend that sends an icon image to a React frontend. Initially, I encode this image as a Base64 string and store it directly in the database. I created an api that returns this string to the frontend. However, I read that it is bad to store it in the database, so I re-wrote the api to store this string in the server as a json file and now my api returns the absolute path to this json file. However, how is the React frontend supposed to retrieve the file? Is it possible to use the absolute path or do I have to create another api to return a file object ? If so, how do I do that?
I'm a newbie at both react and node.js so any help is appreciated.Thanks.
EDIT: I stored the file path as __dirname of where my code resides + filename.I'm getting cors error when accessing that url
Use Express to share out that folder as such-and-such.
Suppose you keep your files in a folder called files, just off the root. And suppose your server structure looks roughly like this:
- backend
- app.js
- frontend
- Components
- Routes
- public
- dev
- index.html (your template file)
- files
- myimage.png
In your root js file (app.js? server.js? index.js?):
const app = express()
app.use('/static', express.static('public'));
app.use('/files', express.static('public/files'));
Then, in the frontend code:
<img src='/files/myimage.png' />
By the way, there is no problem storing images as base64 in your database... but every database backup will also backup those images. If you have a small database, no worries. However, if you have a LOT of images, especially very large images, this will make your database (and backups) unnecessarily large and unwieldy.
Everything depends on your use case.
I'm using express js to serve files to an angular app and I'm deciding between these approaches:
res.status(201).json({ imagepath: '<URL>' });
res.sendFile('<URL>');
I'm thinking that sending the url will force an extra round trip so I should go with the sendFile but I want to doublecheck. Is there anything I'm missing?
The best option would be to store the image file on something like AWS S3 and then send the file URL using your Express application. You would use the aws-sdk package here to save the image to S3 (detailed article here). Then you would send the URL location of that image to your database to be stored.
I have created an MEAN stack web application which uploads image file and store in mongo database. I used Mongo GridFs to store files in Mongo database. it is working fine.
Now I have requirement to create a job using Nodejs to download those images in a folder. I am using "openDownloadStream" method of grid fs to get the file stream. How to store this stream as file in a folder.
There is no http call as this is a simple function which will run as a batch.
how to upload a file which should except only excel or csv file and read the file by using nodejs and update in the database table (mongodb)
front end = angular5
backend = nodejs and mongodb
Please help me with this issue.
On the server side i.e node You will need Multer to upload files and set type to uploaded files, fs (Node Inbuilt) library to work with files, You will need csv package to parse data in that file, Mongoose-ODM to save that to MongoDB.
Next time be specific with your answer and show what you have tried till now.
I'm using Heroku to store my Express app and I can't use bodyParser, or formidable, because both uses temp files to store the posted file.
The file I'm posting is simply a large text file (csv). I don't really need to store the file anywhere, because the data will go into mongodb.
Is there anyway to parse the csv file as it is being uploaded?
Starting with Connect 2.9.0 (Express 3.4.0), bodyParser uses multiparty instead of formidable.
In multiparty's default configuration, it does not create temporary files. Read the docs to see exactly how to handle the incoming data, but you'll want to listen to the part event, which gives you a readable stream containing the uploaded file.