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Take a look at io-ts https://github.com/gcanti/io-ts. It does not only validate, but also decodes, encodes and gives you typescript types.
I made something similar a while back :) https://github.com/Olian04/Recordari
This one does the same, but actually deals in JSON schema https://github.com/sinclairzx81/typebox
NOTE:
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Hence, a higher number means a more popular project.