Ultra fast JSON encoder and decoder for Python
Project description
This is a compatibility fork of ultrajson 1.35 that is intended to coexist with newer versions by renaming the c extension to “ujson1”.
Development on mainline ultrajson 3.x has reumed in https://github.com/ultrajson/ultrajson and please send pull requests there unless they are absolutely necessary to get you OFF of 1.x.
UltraJSON is an ultra fast JSON encoder and decoder written in pure C with bindings for Python 2.5+ and 3.
For a more painless day to day C/C++ JSON decoder experience please checkout ujson4c, based on UltraJSON.
To install it just run Pip as usual:
$ pip install ujson
Usage
May be used as a drop in replacement for most other JSON parsers for Python:
>>> import ujson
>>> ujson.dumps([{"key": "value"}, 81, True])
'[{"key":"value"},81,true]'
>>> ujson.loads("""[{"key": "value"}, 81, true]""")
[{u'key': u'value'}, 81, True]
Encoder options
encode_html_chars
Used to enable special encoding of “unsafe” HTML characters into safer Unicode sequences. Default is false:
>>> ujson.dumps("<script>John&Doe", encode_html_chars=True)
'"\\u003cscript\\u003eJohn\\u0026Doe"'
ensure_ascii
Limits output to ASCII and escapes all extended characters above 127. Default is true. If your end format supports UTF-8 setting this option to false is highly recommended to save space:
>>> ujson.dumps(u"\xe5\xe4\xf6") '"\\u00e5\\u00e4\\u00f6"' >>> ujson.dumps(u"\xe5\xe4\xf6", ensure_ascii=False) '"\xc3\xa5\xc3\xa4\xc3\xb6"'
double_precision
Controls how many decimals to encode for double or decimal values. Default is 9:
>>> ujson.dumps(math.pi) '3.1415926536' >>> ujson.dumps(math.pi, double_precision=1) '3.1' >>> ujson.dumps(math.pi, double_precision=0) '3' >>> ujson.dumps(math.pi, double_precision=4) '3.1416'
escape_forward_slashes
Controls whether forward slashes (/) are escaped. Default is True:
>>> ujson.dumps("http://esn.me")
'"http:\/\/esn.me"'
>>> ujson.dumps("http://esn.me", escape_forward_slashes=False)
'"http://esn.me"'
indent
Controls whether indention (“pretty output”) is enabled. Default is 0 (disabled):
>>> ujson.dumps({"foo": "bar"})
'{"foo":"bar"}'
>>> ujson.dumps({"foo": "bar"}, indent=4)
{
"foo":"bar"
}
Decoders options
precise_float
Set to enable usage of higher precision (strtod) function when decoding string to double values. Default is to use fast but less precise builtin functionality:
>>> ujson.loads("4.56")
4.5600000000000005
>>> ujson.loads("4.56", precise_float=True)
4.5599999999999996
Test machine:
Linux 3.13.0-66-generic x86_64 #108-Ubuntu SMP Wed Oct 7 15:20:27 UTC 2015
Versions:
CPython 2.7.6 (default, Jun 22 2015, 17:58:13) [GCC 4.8.2]
blist : 1.3.6
simplejson: 3.8.1
ujson : 1.34 (0c52200eb4e2d97e548a765d5f089858c41967b0)
yajl : 0.3.5
ujson |
yajl |
simplejson |
json |
|
|---|---|---|---|---|
Array with 256 doubles |
||||
encode |
3508.19 |
5742.00 |
3232.38 |
3309.09 |
decode |
25103.37 |
11257.83 |
11696.26 |
11871.04 |
Array with 256 UTF-8 strings |
||||
encode |
3189.71 |
2717.14 |
2006.38 |
2961.72 |
decode |
1354.94 |
630.54 |
356.35 |
344.05 |
Array with 256 strings |
||||
encode |
18127.47 |
12537.39 |
12541.23 |
20001.00 |
decode |
23264.70 |
12788.85 |
25427.88 |
9352.36 |
Medium complex object |
||||
encode |
10519.38 |
5021.29 |
3686.86 |
4643.47 |
decode |
9676.53 |
5326.79 |
8515.77 |
3017.30 |
Array with 256 True values |
||||
encode |
105998.03 |
102067.28 |
44758.51 |
60424.80 |
decode |
163869.96 |
78341.57 |
110859.36 |
115013.90 |
Array with 256 dict{string, int} pairs |
||||
encode |
13471.32 |
12109.09 |
3876.40 |
8833.92 |
decode |
16890.63 |
8946.07 |
12218.55 |
3350.72 |
Dict with 256 arrays with 256 dict{string, int} pairs |
||||
encode |
50.25 |
46.45 |
13.82 |
29.28 |
decode |
33.27 |
22.10 |
27.91 |
10.43 |
Dict with 256 arrays with 256 dict{string, int} pairs, outputting sorted keys |
||||
encode |
27.19 |
7.75 |
2.39 |
|
Complex object |
||||
encode |
577.98 |
387.81 |
470.02 |
|
decode |
496.73 |
234.44 |
151.00 |
145.16 |
Versions:
CPython 3.4.3 (default, Oct 14 2015, 20:28:29) [GCC 4.8.4]
blist : 1.3.6
simplejson: 3.8.1
ujson : 1.34 (0c52200eb4e2d97e548a765d5f089858c41967b0)
yajl : 0.3.5
ujson |
yajl |
simplejson |
json |
|
|---|---|---|---|---|
Array with 256 doubles |
||||
encode |
3477.15 |
5732.24 |
3016.76 |
3071.99 |
decode |
23625.20 |
9731.45 |
9501.57 |
9901.92 |
Array with 256 UTF-8 strings |
||||
encode |
1995.89 |
2151.61 |
1771.98 |
1817.20 |
decode |
1425.04 |
625.38 |
327.14 |
305.95 |
Array with 256 strings |
||||
encode |
25461.75 |
12188.64 |
13054.76 |
14429.81 |
decode |
21981.31 |
17014.22 |
23869.48 |
22483.58 |
Medium complex object |
||||
encode |
10821.46 |
4837.04 |
3114.04 |
4254.46 |
decode |
7887.77 |
5126.67 |
4934.60 |
6204.97 |
Array with 256 True values |
||||
encode |
100452.86 |
94639.42 |
46657.63 |
60358.63 |
decode |
148312.69 |
75485.90 |
88434.91 |
116395.51 |
Array with 256 dict{string, int} pairs |
||||
encode |
11698.13 |
8886.96 |
3043.69 |
6302.35 |
decode |
10686.40 |
7061.77 |
5646.80 |
7702.29 |
Dict with 256 arrays with 256 dict{string, int} pairs |
||||
encode |
44.26 |
34.43 |
10.40 |
21.97 |
decode |
28.46 |
23.95 |
18.70 |
22.83 |
Dict with 256 arrays with 256 dict{string, int} pairs, outputting sorted keys |
||||
encode |
33.60 |
6.94 |
22.34 |
|
Complex object |
||||
encode |
432.30 |
351.47 |
379.34 |
|
decode |
434.40 |
221.97 |
149.57 |
147.79 |
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