Ordered by japanese release date in PS1.
Credits for the list goes to rotkappchen's video:
(Complete List of All PS1 J RPGs Ever Made - 421 RPG !) https://youtu.be/cd9lfXwF9kw

Missing in Backlogdd:

1995
-Sengoku Cyber: Fujimaru Jigohuken
1996

-Nobunaga's Ambition Returns
-Oukyuu No Hihou: Tenshon
-Spectral Tower
-Satomi no nazo
-Tasogare no Ode: Ode to the Sunset Era

1997
-Nage Libre: Rasen no Soukoku
-Shin Super Robot Taisen Special Disc
-Quo Vadis: Iberukatsu Ikusaeki
-Daibouken Deluxe: Harukanaru Umi
-Seikon no Joker: Hikari to Yami no Seioujou
-Kaibutsu Para-Dice: Monster Paradise
-Shinseiden Megaseed: Fukkatsuhen
-Nobunaga's Ambition: Tenshouki with power-up kit
-Uncharted Waters Gaiden
-Seikoku 1092: Souheiden
-RPG Tsukuru 3
-Nobunaga no Yabou: Shouseiroku
-Melty Lancer Re-Inforce

1998
-Spectral Tower 2
-Mouri Motonari: Chikai no Sanya
-Kouryuuki
-Misaki-Aggresive!
-Himitsu Kessha Q
-Aizouban Houshinengi
-Magical Medical
-End Sector
-Oda Nobunaga Den

1999
-Battle Konchuuden
-Super Hero Sakusen
-Gakuen Sentai Solblast
-Sonata
-Community Pom: Omoide-o Dakishimete
-Hyouryuu Ki: The Reportage Beyond the Sea
-Monster Collection
-Prisoner
-Hikari no Shima: Seven Litographs in Shining Island
-Spectral Blade

2000
-Aquarian Age: Tokyo Wars
-Chiichi Na Oukoku Erutoria
-Blend x Brand
-Brave Sword
-Solid Link: Dungeon Side
-Solid Link: Tower Side
-Super Hero Sakusen: Daidaru no Yabou
-Zoids: Teikoku vs Kyouwakoku

2001
-Zoids 2: Heric vs Guylos
-Romance wa Ken No Kagayaki II
-Dragon Drive Tactics Break
-Final Fantasy I & II: Premium Package
-Front Mission History