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JSON5 serializer and parser for Python 3 written in Cython.

Project description

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


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:

"<a onclick='alert(" + encode(data) + ")'>show message</a>"

Unless the input contains infinite or NaN values, the result will be valid JSON data.


All valid JSON5 1.0.0 and JSON data can be read, unless the nesting level is absurdly high.


You can find the full documentation online at 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.


At least CPython 3.5 or a recent Pypy3 version is needed.

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