How to best download a file on client side?

Hi,

what is the best way to create a download file on the client side, when the content that is to be saved also only exists on the client side?
Do I have to write a Servlet creating a file of the content that is send from the client side?
Or is there any possibility to just make an export without server involved (as data anyhow only exists on client side in my case).

Thanks

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