Nodejs send downloaded file to client

This method of downloading looks the most simple from coding point of view. Why exec and not spawn? Because we just want wget to tell us if the work was done properly or not, we are not interested in buffers and streams.

We are making wget do all the dirty work of making request, handling data, and saving the file for us. As you might have guessed, this method is the fastest among the three methods I described. So now the question is - which method is the best? The answer - whatever suits your need. The wget method is probably the best is you want to save the files to the local disk, but certainly not if you want to send those files as a response to a current client request; for something like that you would need to use a stream.

All the three methods have multiple options, you choice will ultimately depend on what your needs are. How to install Node. StevenVerheyen : This works but somehow someone downvoted it. Don't know why — Renil Babu. Probably because the question wasn't asking for Express?

Lalit Sachdeva Lalit Sachdeva 6, 1 1 gold badge 16 16 silver badges 23 23 bronze badges. MaratArguinbaev - did you make any progress with this and get it to work? I know its an old thread, but I'm trying to do something similar. Qnother question is did you stick with NODE.

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Overview Buffering means that a file's contents are fully materialized buffered in Node. Note that the file name and content type are sent from the client as HTTP headers since the body of the request is reserved for the file content. Lines Each time the data event fires, the chunk of raw data passed in is added to the contentBuffer array.

Also, the amount of data buffered is checked to see if it exceeds the cap set via maxFileSize. If so, the streaming is stopped and an error is returned to the client. Lines A no-op listener is added to the aborted event.

This event would fire if the client aborted the request, say by refreshing the browser while in the middle of an upload. When buffering, it's not necessary to do anything with this event since the data was never passed to the database APIs. Eventually, garbage collection will free the memory used.

Lines When the end event fires, the content buffer array is converted into a scalar Buffer and then passed along to the database API to be inserted. If successful, the id of the file is returned to the client, otherwise a generic error is returned. Database Logic Once the controller logic has passed along the buffered file content and related metadata, the database logic can execute the SQL to insert it.

Lines A variable named binds is declared for the bind definitions. Note that contentBuffer is a simple in bind just like fileName and contentType — the driver does all the heavy lifting. Finally, the data is inserted and the id of the row is returned.