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This package provides functions to query (filter or transform), pivot(convert from array-of-objects to object-of-arrays, for easy import as'R' data frame), search, patch (edit), and validate (againstJSONSchema) 'JSON' and 'NDJSON' strings, files, or URLs. Query andpivot supportJSONpointer,JSONpath orJMESpathexpressions. The implementation uses thejsoncons header-onlylibrary; the library is easily linked to other packages for directaccess to 'C++' functionality not implemented here.

Install the released package version from CRAN

install.packages("rjsoncons",repos="https://CRAN.R-project.org")

Install the development version with

if (!requireNamespace("remotes",quiety=TRUE))    install.packages("remotes",repos="https://CRAN.R-project.org")remotes::install_github("mtmorgan/rjsoncons")

Attach the installed package to yourR session with

library(rjsoncons)

Theintroductory vignette outlines common use cases, including:

• Filter large JSON or NDJSON documents to extract records or elementsof interest.
• Extract deeply nested elements.
• Transform data for more direct incorporation inR data structures.
• 'Patch' JSON strings programmatically, e.g., to update HTTP requestpayloads.
• Validate JSON documents against JSON schemas

Thejsoncons C++ header-only library is a very useful startingpoint for advanced JSON manipulation. The vignette outlines howrjsoncons can be used by otherR packages wishing to access theC++ library.

See theintroductory vignette for additional details.