How do you say peace be with you in Japanese?

またね　/　mata ne AND じゃね　/ jya ne AND じゃまたね　/ jya mata ne all mean see you later in Japanese. じゃあね(jaa ne) or またね(mata ne) is frequently used.

These phrases are informal, so you can say それでは、また。(soredewa mata) or ではまた。 (dewa mata) in business or other social situations.