The online Test Results Announcement for the 2018(December) JLPT is available for viewing from 10:00 am on January 23 (Wed) to 5:00 pm on March 31 (Sun) (Japan Time) 2019 on a dedicated website:
https://www.jlpt-overseas.jp/onlineresults/
Your registration number and password are required to check your test result online. Please note that you will not be able to view your test result online if your 8-digit password was not set up correctly when you applying. Please wait until your result arrives.