I'm traveling fromto

Do I need an adapter when traveling from Taiwan to Japan?

No. Your Type A and B plugs fit outlets in Japan. Voltage there: 100V.

Your plugs

110V, 60Hz

No adapter needed

Your Type A and B plugs fit outlets in Japan.

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No adapter, but worth packingMulti-port USB-C chargerDual-voltage, and charges three devices from one outlet.Shop

100V, 50/60Hz

Your Type A and B plugs fit outlets in Japan, so your chargers plug straight into the wall.

Outlets in Japan supply 100V, just like at home. Everything you pack will run normally.

Eastern Japan, including Tokyo, runs at 50Hz; western Japan, including Osaka, at 60Hz. It only matters for motors and clocks.

Many Japanese outlets have two equal slots, so a US plug with one wider blade may not go in. An adapter fixes it.

Everything to sort before you fly from Taiwan.

No plug adapter: your plugs fit the Type A and B outlets in Japan.
Nothing to convert: Japan runs at 100V, like home.
Japan runs at 50/60Hz. Chargers don't mind; motors and mains-timed clocks may run differently.
A power bank in your carry-on, not your checked bag. Under 100Wh needs no airline approval.
One multi-port USB-C charger, so a single outlet charges everything.
Eastern Japan, including Tokyo, runs at 50Hz; western Japan, including Osaka, at 60Hz. It only matters for motors and clocks.
Many Japanese outlets have two equal slots, so a US plug with one wider blade may not go in. An adapter fixes it.