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janssonr: Strict JSON Encoding and Decoding via the 'Jansson' C Library

An R-safe profile of RFC 8259 JSON: parsing and generation backed by the 'Jansson' C library, linked as a system library where one is available and compiled from the bundled sources otherwise. The parser rejects, with classed conditions carrying line, column, and byte position: malformed or truncated input, trailing content, duplicate object keys at any depth, invalid UTF-8, escapes encoding a null character, reals overflowing double, and integer literals whose magnitude exceeds 2^53, the range within which a double represents every integer exactly. Number literals with a fraction or exponent convert by ordinary correctly rounded IEEE 754 double conversion. Objects decode to named lists in key order, arrays to unnamed lists, and scalars to length-one vectors. The encoder maps named lists to objects in insertion order, unnamed lists to arrays, guarantees that every finite double, signed zero included, round-trips to the exact same value (whole-number doubles are written as integers), and refuses values with no faithful JSON representation (NA, NaN, infinities, named atomic vectors, classed objects) instead of guessing. No R package dependencies.

Version: 0.1.2
Depends: R (≥ 4.4.0)
Suggests: tinytest
Published: 2026-09-12
DOI: 10.32614/CRAN.package.janssonr
Author: Troy Hernandez ORCID iD [aut, cre], cornball.ai [cph], Petri Lehtinen [ctb, cph] (Author of the Jansson C library, bundled under src/jansson), Basile Starynkevitch [ctb, cph] (Jansson: src/jansson/memory.c), Graeme Smecher [ctb, cph] (Jansson: src/jansson/pack_unpack.c), Sean Bright [ctb, cph] (Jansson: src/jansson/version.c), David M. Gay [ctb] (Author of dtoa.c, bundled by Jansson as src/jansson/dtoa.c), Lucent Technologies [cph] (src/jansson/dtoa.c), Bob Jenkins [ctb] (Author of lookup3.c (public domain), bundled by Jansson as src/jansson/lookup3.h)
Maintainer: Troy Hernandez <troy at cornball.ai>
BugReports: https://github.com/cornball-ai/janssonr/issues
License: MIT + file LICENSE
Copyright: cornball.ai, except the bundled Jansson sources under src/jansson, whose per-file copyright holders and license statements are listed in inst/COPYRIGHTS.
janssonr copyright details
URL: https://github.com/cornball-ai/janssonr
NeedsCompilation: yes
SystemRequirements: jansson (>= 2.11) is linked when present: libjansson-dev (deb), jansson-devel (rpm), jansson (brew). When it is absent, and always on Windows, the bundled Jansson 2.15.1 is compiled into the package.
Materials: README, NEWS
CRAN checks: janssonr results [issues need fixing before 2026-10-05]

Documentation:

Reference manual: janssonr.html , janssonr.pdf

Downloads:

Package source: janssonr_0.1.2.tar.gz
Windows binaries: r-devel: not available, r-release: not available, r-oldrel: not available
macOS binaries: r-release (arm64): not available, r-oldrel (arm64): janssonr_0.1.2.tgz, r-release (x86_64): janssonr_0.1.2.tgz, r-oldrel (x86_64): janssonr_0.1.2.tgz

Linking:

Please use the canonical form https://CRAN.R-project.org/package=janssonr to link to this page.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.