Jansson is a JSON data encoding, decoding, and manipulating C library.
For more information see the project home page:
https://github.com/akheron/jansson
The following packages have been upgraded in the Cygwin distribution:
- libjansson-doc 2.15.1
- libjansson-devel 2.15.1
- libjansson4 2.15.1
For changes since the previous Cygwin release, see below or after
installation read /usr/share/doc/jansson/CHANGES:
https://jansson.readthedocs.io/en/latest/changes.html#version-2-15-1
2026-06-30 2.15.1
Fixes:
- Include the object key or array index in unpack type mismatch error messages
- Reject negative string length in the 'json_pack' 's#' and '+#' formats
- Limit recursion depth in dump, equal and deep copy to prevent stack overflow
Build:
- Only export symbols starting with 'json_' and 'jansson_' from the CMake build
- Include 'jansson_private_config.h' only if 'HAVE_CONFIG_H' is enabled
- Add a configurable pkg-config install path to the CMake build
- Only use '--default-symver' when the linker supports it
2026-01-24 2.15
New features:
- Add support for realloc by adding 'json_set_alloc_funcs2',
'json_get_alloc_funcs2'
Fixes:
- Optimize serialization
- Fix docstrings in hashtable.h
Build
- Use target-based cmake settings
2025-03-23 2.14.1
Fixes:
- Fix thread safety of encoding and decoding when 'uselocale' or
'newlocale' is used to switch locales inside the threads
- Use David M. Gay's 'dtoa()' algorithm to avoid misprinting issues of
real numbers that are not exactly representable as a 'double'
If this is not desirable, use './configure --disable-dtoa' or
'cmake -DUSE_DTOA=OFF'
Build:
- Make test output nicer in CMake based builds
- Simplify tests
2021-09-09 2.14
New Features:
- Add 'json_object_getn', 'json_object_setn', 'json_object_deln', and
the corresponding 'nocheck' functions
Fixes:
- Handle 'sprintf' corner cases
Build:
- Symbol versioning for all exported symbols
- Fix compiler warnings
Documentation:
- Small fixes
- Sphinx 3 compatibility
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