Japan does not accept Duolingo as a valid form of proof of Japanese language proficiency. The Japanese Language Proficiency Test (JLPT) is the only recognized assessment of language skills in Japan. However, Duolingo can still be a useful tool for learning Japanese and should be used as a supplement to other language-learning methods. Learning Japanese can have many benefits both personally and professionally. There are alternative ways to prove Japanese language proficiency if you cannot take the JLPT, such as enrolling in a language school or taking the Business Japanese Proficiency Test (BJT).