Parse JSON with R

Question

I am fairly new to R  but the more use it  the more I see how powerful it really is over SAS or SPSS   Just one of the major benefits  as I see them  is the ability to get and analyze data from the web   I imagine this is possible  and maybe even straightforward   but I am looking to parse JSON data that is publicly available on the web   I am not a programmer by any stretch  so any help and instruction you can provide will be greatly appreciated   Even if you point me to a basic working example  I probably can work through it

User · Answer

Try below code using RJSONIO in console  library RJSONIO  library RCurl    json file   getURL  https   raw githubusercontent com isrini SI IS607 master books json    json file2   RJSONIO  fromJSON json file   head json file2

User · Answer

RJSONIO from Omegahat is another package which provides facilities for reading and writing data in JSON format  rjson does not use S4 S3 methods and so is not readily extensible  but still useful  Unfortunately  it does not used vectorized operations and so is too slow for non-trivial data  Similarly  for reading JSON data into R  it is somewhat slow and so does not scale to large data  should this be an issue  Update  new Package 2013-12-03   jsonlite  This package is a fork of the RJSONIO package  It builds on the parser from RJSONIO but implements a different mapping between R objects and JSON strings  The C code in this package is mostly from the RJSONIO Package  the R code has been rewritten from scratch  In addition to drop-in replacements for fromJSON and toJSON  the package has functions to serialize objects  Furthermore  the package contains a lot of unit tests to make sure that all edge cases are encoded and decoded consistently for use with dynamic data in systems and applications

User · Answer

For the record  rjson and RJSONIO do change the file type  but they don t really parse per se  For instance  I receive ugly MongoDB data in JSON format  convert it with rjson or RJSONIO  then use unlist and tons of manual correction to actually parse it into a usable matrix

User · Answer

Here is the missing example  library rjson  url  lt -  http   someurl data json  document  lt - fromJSON file url  method  C

User · Answer

The jsonlite package is easy to use and tries to convert json into data frames   Example   library jsonlite     url with some information about project in Andalussia url  lt -  http   www juntadeandalucia es export drupaljda ayudas json     read url and convert to data frame document  lt - fromJSON txt url

User · Answer

The function fromJSON   in RJSONIO  rjson and jsonlite don t return a simple 2D data frame for complex nested json objects    To overcome this you can use tidyjson  It takes in a json and always returns a data frame  It is currently not availble in CRAN  you can get it here  https   github com sailthru tidyjson  Update   tidyjson is now available in cran  you can install it directly using install packages  tidyjson

[json] Parse JSON with R

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