Kijewski
pyjson5
Cython

A JSON5 serializer and parser library for Python 3 written in Cython.

Last updated Jul 24, 2026
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README

PyJSON5 ==========

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A JSON5 serializer and parser library for Python 3 written in Cython <http://cython.org/>_.

Serializer


The serializer returns ASCII data that can safely be used in an HTML template. Apostrophes, ampersands, greater-than, and less-then signs are encoded as unicode escaped sequences. E.g. this snippet is safe for any and all input:

.. code:: html

"show message"

Unless the input contains infinite or NaN values, the result will be valid JSON <https://tools.ietf.org/html/rfc8259>_ data.

Parser


All valid JSON5 1.0.0 <https://spec.json5.org/>_ and JSON <https://tools.ietf.org/html/rfc8259>_ data can be read, unless the nesting level is absurdly high.

Functions


You can find the full documentation online at https://pyjson5.readthedocs.io/en/latest/. Or simply call `help(pyjson5). :-)

The library supplies load(s) and dump(s) functions, so you can use it as a drop-in replacement for Python's builtin json module, but you should use the functions encode() and decode()` instead.

Compatibility


At least CPython 3.8 or a recent Pypy3 version is needed.

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