Ultra fast JSON encoder and decoder for Python
Project description
UltraJSON-x 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-x
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"'
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"
}
Benchmarks
UltraJSON-x calls/sec compared to three other popular JSON parsers with performance gain specified below each.
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 |
Project details
Release history Release notifications | RSS feed
Download files
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
Source Distribution
File details
Details for the file ujson-x-1.37.tar.gz
.
File metadata
- Download URL: ujson-x-1.37.tar.gz
- Upload date:
- Size: 7.1 MB
- Tags: Source
- Uploaded using Trusted Publishing? No
- Uploaded via: twine/1.13.0 pkginfo/1.5.0.1 requests/2.21.0 setuptools/38.4.0 requests-toolbelt/0.9.1 tqdm/4.31.1 CPython/2.7.12
File hashes
Algorithm | Hash digest | |
---|---|---|
SHA256 | 914469954ed0cf8965b6bdbc138f518dbaa45e2d7909f75ded633d8a7461ea31 |
|
MD5 | 20d02bdb976546f9d6158f1ac0e6fc81 |
|
BLAKE2b-256 | 4419f2b98662b4c6e43dbe9e10d87a62358aeab5e45b49ef0bef4a583bbd34db |