Hi I need to ask for Japan work visa what is the...

To obtain a work visa in Japan, you must obtain a work contract, and then go to the Embassy of Japan in the country where you reside, and apply for a visa,

The application shall be accompanied by the following documents:
1) Copy of a valid passport for at least six months 
2) Two photographs with the same specifications of passport photo with white background for each
3) booking flight
4) Copy of the contract of employment or letter of employment