Node js check if file download is complete

That's all there is to it! If I make a request to the download page, which has a sleep command for several seconds, I get the following console output:. File still downloading How sweet is that!

This is so simple, I can't believe I've never seen this before! I'll definitely be incorporating this approach in my ColdFusion applications. Gary Sep 23, at PM 13 Comments. The advantage of using HTTP.

Since the HTTP. One each data event, write the data to the writeable stream. Once the server finishes sending data, close the instance of fs. If you use fs. Use fs. To download files using curl in Node. We are using spawn instead of exec for the sake of convenience - spawn returns a stream with data event and doesn't have buffer size issue unlike exec. That doesn't mean exec is inferior to spawn ; in fact we will use exec to download files using wget.

The way data was written to the instance of fs. The only difference is that the data and end events are listened on the stdout object of spawn. Also we listen to spawn 's exit event to make note of any errors. Although it says downloading using wget , this example applies to downloading using curl with the -O option too.

However when downloading binary files, the responseType property of the request object is set to blob. Possible values of responseType property are empty string default , arraybuffer , blob , document , json , and text. For simply downloading binary files use blob as the response type. For complex cases where you need to download a file and then manipulate the file's bytes - for example if you are building a Javascript "PPT Viewer", set arraybuffer as the response type.

Through this you can get the percentage of the file downloaded.