R version 4.5.0 alpha (2025-03-25 r88054 ucrt)
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Platform: x86_64-w64-mingw32/x64

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> library(RJSONIO)
> a = array(1:(5*7*9), c(5, 7, 9))
> o = toJSON(a)
> isValidJSON(I(o))
[1] TRUE
> b = fromJSON(I(o))
> 
> toJSON(table(1:3))
[1] "[\n1, 1, 1\n]"
> toJSON(table(1:3, 1:3))
[1] "[ {\n   \"1\": 1,\n  \"2\": 0,\n  \"3\": 0 \n  },\n{\n   \"1\": 0,\n  \"2\": 1,\n  \"3\": 0 \n  },\n{\n   \"1\": 0,\n  \"2\": 0,\n  \"3\": 1 \n  } ]"
> 
> #z = apply(a, 3, function(x, dim) toJSON(x))
> #toJSON(array(1:8,c(2,2,2)))
> 
> proc.time()
   user  system elapsed 
   0.18    0.09    0.26