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  • Can a Godot app running on web create a zip file for the user to download?

I need to write an app that creates a zip file which the user can then download to their machine. I need two things - a library that can create a ZIP file and a way to have the user download that file, neither of which I can find. Can Godot do this?

  • kitfox replied to this.

  • kitfox Looks like Godot can export files for download using JavaScriptBridge and Godot 4 has provided a new ZIPPacker that lets you create zip archives.

    Here's some code packing some files into an archive and then downloading them through the web browser:

    	var writer:ZIPPacker = ZIPPacker.new()
	var filepath:String = "user://archive.zip"
	var err := writer.open(filepath)
	if err != OK:
		return err
		
	writer.start_file("hello.txt")
	writer.write_file("Hello World".to_utf8_buffer())
	writer.close_file()
	writer.start_file("goodbye.txt")
	writer.write_file("So long!".to_utf8_buffer())
	writer.close_file()
	writer.close()
	
	var f = FileAccess.open(filepath, FileAccess.READ)
	var buf = f.get_buffer(f.get_length())
	JavaScriptBridge.download_buffer(buf, "archive.zip", "application/zip")

      Wouldn't it be the server that creates and then serves that file? I'd think that's the typical way to go about it.

        Megalomaniak I know Javascript has the ability to do this entirely client side. I was hoping to do everything client side just to keep things simple.

            Yes, just look for Javascript libraries to do it.

            kitfox I know Javascript has the ability to do this entirely client side.

            If it's entirely dependent on data on the clientside/in browser then yes, I recon js is the way to go. And I think that the godot web player and js can talk to each other, though it's been a while since I've looked at that.

              kitfox Looks like Godot can export files for download using JavaScriptBridge and Godot 4 has provided a new ZIPPacker that lets you create zip archives.

              Here's some code packing some files into an archive and then downloading them through the web browser:

              	var writer:ZIPPacker = ZIPPacker.new()
	var filepath:String = "user://archive.zip"
	var err := writer.open(filepath)
	if err != OK:
		return err
		
	writer.start_file("hello.txt")
	writer.write_file("Hello World".to_utf8_buffer())
	writer.close_file()
	writer.start_file("goodbye.txt")
	writer.write_file("So long!".to_utf8_buffer())
	writer.close_file()
	writer.close()
	
	var f = FileAccess.open(filepath, FileAccess.READ)
	var buf = f.get_buffer(f.get_length())
	JavaScriptBridge.download_buffer(buf, "archive.zip", "application/zip")