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Project description
pyjson5
A Python implementation of the JSON5 data format.
JSON5 extends the JSON data interchange format to make it slightly more usable as a configuration language:
-
JavaScript-style comments (both single and multi-line) are legal.
-
Object keys may be unquoted if they are legal ECMAScript identifiers
-
Objects and arrays may end with trailing commas.
-
Strings can be single-quoted, and multi-line string literals are allowed.
There are a few other more minor extensions to JSON; see the above page for the full details.
This project implements a reader and writer implementation for Python; where possible, it mirrors the standard Python JSON API package for ease of use.
This is an early release. It has been reasonably well-tested, but it is SLOW. It can be 1000-6000x slower than the C-optimized JSON module, and is 200x slower (or more) than the pure Python JSON module.
Known issues
-
Did I mention that it is SLOW?
-
The implementation follows Python3's
json
implementation where possible. This means that theencoding
method todump()
is ignored, and unicode strings are always returned. -
The
cls
keyword argument thatjson.load()
/json.loads()
accepts to specify a custom subclass ofJSONDecoder
is not and will not be supported, because this implementation uses a completely different approach to parsing strings and doesn't have anything like theJSONDecoder
class. -
The
cls
keyword argument thatjson.dump()
/json.dumps()
accepts is also not supported, for consistency withjson5.load()
. Thedefault
keyword is supported, though, and might be able to serve as a workaround.
Version History / Release Notes
-
v0.7 (2019-03-31)
- Changes dump()/dumps() to not quote object keys by default if they are
legal identifiers. Passing
quote_keys=True
will turn that off and always quote object keys. - Changes dump()/dumps() to insert trailing commas after the last item
in an array or an object if the object is printed across multiple lines
(i.e., if
indent
is not None). Passingtrailing_commas=False
will turn that off. - The
json5.tool
command line tool now supports the--indent
,--[no-]quote-keys
, and--[no-]trailing-commas
flags to allow for more control over the output, in addition to the existing--as-json
flag. - The
json5.tool
command line tool no longer supports reading from multiple files, you can now only read from a single file or from standard input. - The implementation no longer relies on the standard
json
module for anything. The output should still match the json module (except as noted above) and discrepancies should be reported as bugs.
- Changes dump()/dumps() to not quote object keys by default if they are
legal identifiers. Passing
-
v0.6.2 (2019-03-08)
- Fix GitHub issue #23 and pass through unrecognized escape sequences.
-
v0.6.1 (2018-05-22)
- Cleaned up a couple minor nits in the package.
-
v0.6.0 (2017-11-28)
- First implementation that attempted to implement 100% of the spec.
-
v0.5.0 (2017-09-04)
- First implementation that supported the full set of kwargs that
the
json
module supports.
- First implementation that supported the full set of kwargs that
the
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