Show 7 more comments. Kelvin Omereshone 2 2 silver badges 11 11 bronze badges. Abdul You specify the callback with a function only if you need to do something when the file has been successfully fetched. It would be good to check the status code before saving: response. But we don't check the result return cb err. Buzut Buzut 4, 4 4 gold badges 41 41 silver badges 50 50 bronze badges. The request module just works straight for HTTPs.
S Ventura. It's more error prone without a doubt. Anyway, in any case where using request module is an option, I'd advise it as it's way higher level and thus, easier and efficient. Alex, nope, this is an error message and there's a return. So if response. Thank you for showing example using request module.
Show 3 more comments. MikeL 5, 38 38 silver badges 41 41 bronze badges. Augusto Roman Augusto Roman 6 6 silver badges 4 4 bronze badges. What for are you storing request into a variable? You are right, there is no need to save the request, its not used anyway. That's what you mean? Yes, I think that's what polkovnikov. Per default the fs.
Bjarke Pjedsted Bjarke Pjedsted 4 4 silver badges 8 8 bronze badges. Two comments on this: 1 it should probably reject Error objects, not strings, 2 fs. This works great! No errors popped up but the. Removing the logic for the flag fixed it. Just wanted to point that out if someone had the issues with the approach.
Is there a memory leak in this answer: stackoverflow. You can add timeout like I did in http. The memory leak is only if the file take too long to be downloaded. Based on the other answers above and some subtle issues, here is my attempt.
Check the file does not exist before hitting the network by using fs. Only create the fs. This reduces the amount of fs. Even on a OK we can still possibly reject due to an EEXIST file already exists imagine another process created the file whilst we were doing network calls.
Recursively call download if you get a Moved Permanently or Found Moved Temporarily redirect following the link location provided in the header. The issue with some of the other answers recursively calling download was that they called resolve download instead of download This way the nested chain of promises resolve in the correct order.
It might seem cool to clean up the temp file asynchronously, but I chose to reject only after that completed too so I know that everything start to finish is done when this promise resolves or rejects.
Josh Peak Josh Peak 4, 4 4 gold badges 33 33 silver badges 48 48 bronze badges. You shouldn't waste resources doing the download if the destination file already exists. No spam ever, unsubscribe at any time. How to download a file in Node. Built-in modules Node. You might also like Its taking time at the same time other windows application that dont use server is much quicker. So how can i solve this issue of performance Please reply ASAP. I am able to upload and download files, but the downloaded files are in different format i.
I am not able to use it. I renamed those files to appropriate format still it is not working. ReferenceError: router is not defined please help! Share a Post. Are you sure you want to leave and discard your draft?
Go back Discard. Upload and Download File in Node. Step 2 Install Dependency Now install the al dependency which is required. Step 5 Upload Code Our index. Step 6 Get All Files from uploads directory and Show in Table It is necessary get files from any directory to give the download. Step 8 Download Code This step to create the download file. JS Node JS. Anchal Kesharwani.
My front end client is in NodeJS. I am not able to download the file from the REST service. I can only store the file at a particular location, but I want to have a download dialogue box where the user can store the file just like any other download dialogue box. My NodeJS code is as below:. And the result which I get on the NodeJS side is just like an alert box with the file contents in it. See output below:. Can anyone please let me know what mistake I am doing here. I would like to have download dialogue box when the user clicks on the Download button.
When clicking the download button, a call should go to the REST service which in turn will send the file to the NodeJS front end and a dialogue box will open, which will ask the user for the location. If you are using an ajax request, its not possible to download a file this way.
Browsers make it impossible to make downloads through ajax requests. I used jQuery in this example but I think it illustrates what needs to be done. The window. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
0コメント