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Working with expressjs for about a month by now I have stumbled across the problem of file uploads. Despite consulting Google & various blogs I have failed finding an answer to the following three questions:
What do I have to do / what settings for bodyParser do I have to choose in order to:
Make sure there was indeed a file uploaded (currently, when submitting the form without choosing a file an empty file gets created).
Where can I specify a value for the maxium size a file is allowed to have?
How can I omit the renaming of the file?
Currently I am including bodyParser in my express (v. 3.0.0) app with the following option:
{keepExtensions: true, uploadDir: __dirname + '/public/uploads'}
698
To fix the “413 Request Entity Too Large” error in an Express application, you only have to update the server initialization file. This is generally called index. js or server. js and is where you initialize the Express server.
Error handling If you want to catch errors specifically from Multer, you can call the middleware function by yourself. Also, if you want to catch only the Multer errors, you can use the MulterError class that is attached to the multer object itself (e.g. err instanceof multer.
Multer is a node. js middleware for handling multipart/form-data, which is primarily used for uploading files.
Multer is a middleware designed to handle multipart/form-data in forms. It is similar to the popular Node. js body-parser , which is built into Express middleware for form submissions. But, Multer differs in that it supports multipart data, only processing multipart/form-data forms.
I recently ran into a similar problem. for Question #2, check http://www.senchalabs.org/connect/middleware-limit.html
app.use(express.limit('4M')); // in your app.configure()
app.post('/upload', function(req, res) {
var fs = require('fs'),
file = req.files.myfile; //your file field;
if(file.size === 0) { // question #1
fs.unlinkSync(file.path);
res.redirect('/error?');
} else { //question #3
var fn = file.path.split('/');
fs.rename(file.path, file.path.replace(fn[fn.length-1], file.name));
res.redirect('/success?');
}
});
About your concern
Make sure there was indeed a file uploaded (currently, when submitting the form without choosing a file an empty file gets created).
After long search I found a great solution
First you need to install node-formidable
Then after including the library, to check if file uploaded in the first place
var form = new formidable.IncomingForm();
form.parse(req, function(err, fields, files) {
if (Object.keys(files).length !== 0) {
console.log("File exists")
} else {
console.log("File does not exist")
}
});
And about the size you can check this.
form.maxFieldsSize = 2 * 1024 * 1024;
Best regards.
Abdulaziz Noor
28
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