Like USA uplifted the Europe by Marshall Plan post -WWII, it also hugely provided Japan with free capital. Of course , Japanese made proper use of that money adopting consumer based capitalism and selling to the world top class products. They toiled hard .
The technological secret is japan never invented anything worth mentioning in electronics and automobiles….they only borrowed designs ( for which the west often jeers at them) – but their concentration was on materials and they brought out fantastic materials for miniaturization and reliability . The world owes this to them. They used the material research for themselves and came to the top in consumer durable products. Of course, then SK, taiwan , hongkong etc. followed.
China and India has billions of mouths to feed. They cannot become industrialized countries , ie 50% labor must work on farms. India struggles for FDI and China struggles for western market.