filename OptionalĪ string representing a file path relative to the default downloads directory - this provides the location where you want the file to be saved, and what filename you want to use. Use requires the 'cookies' API permission. If omitted, the default cookie store is used. The cookie store ID of the contextual identity the download is associated with. conflictAction OptionalĪ string representing the action you want taken if there is a filename conflict, as defined in the downloads.FilenameConflictAction type (defaults to 'uniquify' when it is not specified). However, if the download fails due to file-related, network-related, user-related, or other error, that error is reported.Ī string representing the post body of the request. true, the download continues when an HTTP error is encountered and the HTTP server error is not reported.false, the download is canceled when it encounters an HTTP error.Using this flag, for example, enables the download of server error pages. It can contain the following properties: allowHttpErrors OptionalĪ boolean flag that enables downloads to continue even if they encounter HTTP errors. Differences between API implementationsĪn object specifying what file you wish to download, and any other preferences you wish to set concerning the download.The following simple function allow you to generate a download of a file directly in the browser without contact any server. In this article we are going to show you a couple of tricks to generate and download directly a file using pure Javascript. Therefore, the automatic download of file has been difficult to achieve in the latest years, but now with the introduction of HTML5, this task has become easier to achieve.

However, in the latest browsers unknow or rare downloaded file extensions are blocked and a prompt appears if you really want to open that file (at less in Chrome).

Imagine that you use Google Chrome and you have enabled the option 'Auto-open downloaded files', and for your bad luck you enter in a malicious website and it generates the download of an unknown file. Generate and download a file using Javascript ? If you think about it, this isn't so secure as you think and shouldn't be allowed without the user interaction (however now is allowed).

Download blob javascript