He is best known for hit singles such as "La Pregunta", "Junto al Amanecer", "Sexo, Sudor y Calor" and "Regálame Una Noche".

When Alvarez was 12 years old he sang in front of several of his classmates and teachers, his first-ever song "Lo Que Ella Trae" (What She Brings).

He was then signed to Flow Music in 2009, and later that year, his debut mixtape El Dueño Del Sistema was released, which included collaborations with several high-profile artists such as De La Ghetto, Jowell & Randy, and Ñejo & Dalmata.

On January 27, 2015, J Álvarez released De Camino Pa' La Cima Reloaded, his fourth studio album, which features Cosculluela and Wisin.

In November 2018, the Recording Industry Association of America certified that the single "De La Mia Personal" had reached platinum status.