I got a couple of the USB devices you see below from Technology First, a local trade organization I've volunteered my time for the past 20+ years. All it does is allow the two power pins to pass through while blocking the two data pins. Juice Jacking is the term for hacking into your device while appearing to be a free and easy way to charge your device. By blocking the data pins that can't physically happen.
If you're the paranoid type or simply want to eliminate a real risk for a few dollars, you can pick up a 2-pack for $10 at the Amazon link below.
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