Saving a JSON object to file.JSON

There is also the jsonlite package:

library(jsonlite)

exportJSON <- toJSON(list1)
write(exportJSON, "test.json")
list2 <- fromJSON("test.json")

identical(list1, list2)

You can use write:

library(RJSONIO)
list1 <- vector(mode="list", length=2)
list1[[1]] <- c("a", "b", "c")
list1[[2]] <- c(1, 2, 3)

exportJson <- toJSON(list1)
> exportJson
[1] "[\n [ \"a\", \"b\", \"c\" ],\n[      1,      2,      3 ] \n]"
write(exportJson, "test.json")
library("rjson")
json_data <- fromJSON(file="test.json")
> json_data
[[1]]
[1] "a" "b" "c"

[[2]]
[1] 1 2 3