jsonlite (version 0.9.0)

serializeJSON: Serialize R objects to JSON

Description

Just like toJSON and fromJSON, the serializeJSON and unserializeJSON functions convert between R objects to JSON. However instead of using a class based encoding, the serialize functions base the encoding schema on the storage type of an object. They use a much more verbose encoding schema which captures all data and attributes from any object, such that it can be almost perfectly restored from its JSON representation. Almost all storage types (except for environments) are supported.

Usage

serializeJSON(x, digits = 8, pretty = FALSE)
  unserializeJSON(txt)

Arguments

x

an R object to be serialized

digits

max number of digits (after the dot) to print for numeric values

pretty

add indentation/whitespace to JSON output. See prettify

txt

a JSON string which was created using serializeJSON

Details

Note that JSON is a text based format which leads to loss of precision when printing numbers.

Examples

jsoncars <- serializeJSON(mtcars)
mtcars2 <- unserializeJSON(jsoncars)
identical(mtcars, mtcars2)

set.seed('123')
myobject <- list(
  mynull = NULL,
  mycomplex = lapply(eigen(matrix(-rnorm(9),3)), round, 3),
  mymatrix = round(matrix(rnorm(9), 3),3),
  myint = as.integer(c(1,2,3)),
  mydf = cars,
  mylist = list(foo="bar", 123, NA, NULL, list("test")),
  mylogical = c(TRUE,FALSE,NA),
  mychar = c("foo", NA, "bar"),
  somemissings = c(1,2,NA,NaN,5, Inf, 7 -Inf, 9, NA),
  myrawvec = charToRaw("This is a test")
);
identical(unserializeJSON(serializeJSON(myobject)), myobject);

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