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Convert R To JSON

toJSON.Rd

Convert an R object into a corresponding JSON object.

***Lists with unnamed components are not currently supported***

Usage

toJSON( x, indent=0, method="C" )

Arguments

x

a vector or list to convert into a JSON object

indent

an integer specifying how much indentation to use when formatting the JSON object; if 0, no pretty-formatting is used

method

use the C implementation, or the older slower (and one day to be depricated) R implementation

Value

a string containing the JSON object

See also

fromJSON

Examples

x <- list( alpha = 1:5, beta = "Bravo", 
           gamma = list(a=1:3, b=NULL), 
           delta = c(TRUE, FALSE) )
json <- toJSON( x )
fromJSON( json )
#> $alpha
#> [1] 1 2 3 4 5
#> 
#> $beta
#> [1] "Bravo"
#> 
#> $gamma
#> $gamma$a
#> [1] 1 2 3
#> 
#> $gamma$b
#> NULL
#> 
#> 
#> $delta
#> [1]  TRUE FALSE
#> 


#named vectors are treated as JSON objects (lists)
toJSON(islands[1:4])
#> [1] "{\"Africa\":11506,\"Antarctica\":5500,\"Asia\":16988,\"Australia\":2968}"


#data.frames must be converted into a list before converting into JSON
plot(cars, pch=2)
json_cars <- toJSON(as.list(cars))
points( data.frame( fromJSON( json_cars ) ), col="red", pch=3 )


#special R types are encoded as strings
testString <- c(1,2,3,4,NA,NaN,Inf,8,9);
toJSON(testString);
#> [1] "[1,2,3,4,\"NA\",\"NaN\",\"Inf\",8,9]"