I am currently working on an application with the current tech stack:
Backend:
Mongoose
Express
Apollo
GraphQL
Frontend:
Vuejs
Apollo
GraphQL
I have succeeded in uploading files to the server using GraphQL, what I am stuck with is how to implement the 'download' feature. With a normal RESTApi endpoint I can use res.download(filePath) and it works. How do I do this with GraphQL since I don't want to use REST.
Or is there any other standard to go by in this scenario?
Thanks!
GraphQL uses JSON format, which represents as text format, not as binary.
If you don't want download files with REST, then you should:
Encode your file content into base64 string in the back end. Related question
Send this string as part of query response.
Save encoded base64 string as a file in the front end. Related question
But right architecture design is add a file link in the GraphQL response and use browser for downloading/rendering the file.
It's better to send a hashed & temporary link to download it
Save the file and hash the name on your static server (to limit access to other users)
The file should be temporary and should expire in a short time
Send the link of the file in response to API
Related
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'm implementing a webserver using Koa. One of my request handlers needs to receive and store a large zip file. The file is NOT uploaded from a web page, but sent from another NodeJs application. Therefore it's not multipart encoded, but just applcation/octet-stream. How can I read such a file from the request?
I've noticed there is a request.socket object but I could not find any documentation on how to use it.
In other words I need the opposite to
this.body = fs.createReadStream(path);
I'm developing a RESTful API for a mobile client application with the combination of Node.js, Express.js and Mongodb.
Now I'm trying to handle the upload of the user profile image and I've found a module called "multer" (that is the one ecommended by express.js team itself) that allow the express.app to handle multipart/form-data requests.
Now I need to test the app and, moreover, the upload function but I'm not able to simulate a http-form request (via postman chrome plugin).
Multer returns this error:
[Error: Multipart: Boundary not found]
In fact, comparing an http-form request (which works) with a custom http request, the second one has not the Boundary header property.
What Boundary property is?
If you are using Postman, you can try removing the Header: "Content-type": "multipart/form-data". I removed it and now it works.
Boundary in a multipart form indicates some delimiter string separating text and binary data. You can do this in postman but it sounds like you aren't sending both file and text so postman maybe defaults to a regular form. do you see something like:
If you click preview in postman you can see the boundary in the Content-type header and in the body.
solutions:
1) don't specify the content-type at client
2) use the naming convention(imageUpload) in upload.single('imageUpload') same as field name
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.
I am trying to build a test app for learning Node.js. I came from wordpress background and Apache has setup most of backend logics for me. But now, I have to build my own. I have a question about how to serve JSON files from server side to client side. What is the workflow -- Backbone.js handle all client side Data manipulation, send/save/get/fetch from couchDB, serve JSON object from NODE.js backend?
I am using Express Microframework for building HTTP server, installed the Cradle middleware for access CouchDB NoSQL database. I successfully posted the data from Client side HTML (Jade template engine) to the CouchDB Database/Document and able to retrieve those data back from Server through Cradle middleware. Things work out great. But it was all done by Backend.
I want to use Backbone.js for my client side Javascript. Backbone.js is looking for JSON object which send back from the HTTP server. Cradle Middleware is able to create JSON object but only send them directly to the Jade Template, I could use Jade syntax for loop to iterate over the data object but it still not meet what I want for Backbone.js handle all the data entry. I realize that I need to get JSON obj via ajax ( either a file generated by HTTP then send back to the client OR send straight object to the client ). Cradle Middleware could not do that.
I did more research on this questions. I tried CouchApp, it does what I need. Using the Backbone.js to handling all the data, send/save/fetch data from CouchDB database. But it is a running in CouchApp, it is not an Express Node.js workflow. ( Maybe I am wrong or just do not how it work )
I tried backbone-couchdb.js. I read through the Details and still do not know it is going to help me to get what I want. ( Maybe need more tutorial or code example ). I am still thinking that I need a Backbone CouchDB driver to connect those two and somehow serving them by NODE.js backend.
Is there anybody who could tell me about how JSON file is being served by Node.js, how backbone.js interact with data save/fetch/get from CouchDB? What is the best practice / workflow? Other good resources, code examples, useful tools?
Cradle Middleware is able to create JSON object but only send them directly to the Jade Template
This is incorrect. You can just send the json back without rendering a template.
function(req, res, next){
db.view('user/byUsername', { key: 'luke' }, function (err, doc) {
res.send(doc); // or res.json(doc);
});
}