Serialize R Objects to JSON R package RJSONIO version 2.0.5 CRAN Task View: WebTechnologies (https://CRAN.R-project.org/view=WebTechnologies) Converts R objects to and from JavaScript Object Notation (JSON). The package provides a stable interface for reading JSON from strings, files, and connections, and for serializing common R objects, including vectors, lists, data frames, arrays, environments, and S4 objects. It also exposes parser handlers, callbacks, and S4 methods for applications that need customized JSON processing while preserving established RJSONIO behavior. Software Imports: methods Suggests: knitr, rmarkdown, testthat (>= 3.0.0) Yaoxiang Li <liyaoxiang@outlook.com> Comprehensive R Archive Network (CRAN) Yaoxiang Li [aut, ctb, cre] (ORCID: <https://orcid.org/0000-0001-9200-1016>), CRAN Team [aut], Duncan Temple Lang [aut] (ORCID: <https://orcid.org/0000-0003-0159-1546>), Jonathan Wallace [aut] (aka ninja9578, author of included libjson sources) BSD_3_clause + file LICENSE (https://CRAN.R-project.org/package=RJSONIO/LICENSE) 2026-05-15 application/tgz https://CRAN.R-project.org/package=RJSONIO doi:10.32614/CRAN.package.RJSONIO