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Japanese WW2 era nuclear weapon program never went beyond laboratory stage, and starting heavy water production at a Korean hydro-electric facility. They began too late and did not have the industrial and financial resources to successfully pursue such a program to completion.
On the other hand they were supposed to have developed some very nasty biological and chemical weapons, which would have gone into 2nd generation balloon bombs.
(The German atomic bomb designers made a wrong assumption about atomic cross section or made calculation error which hindered their progress so they never got beyond building an atomic pile.
They did have terrifying chemical weapons, which they did not use because they mistakenly believed the US had reached a similar stage of chemical weapon development and they were afraid of retaliation in kind if they used their chemical weapons.
Also after the war Goering is supposed to have said one reason they did not use chemical weapons was that the Wermacht still relied heavily on horse drawn transport, particularly on the Eastern Front, and they could not protect their own horses from chemical weapons.
German nerve gas killed two British technicians, who were doing post war cleanup.)
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