Skip to main content

Ultra fast JSON encoder and decoder for Python

Project description

https://travis-ci.org/PawelTroka/ultrajson-x.svg?branch=master

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.

Please checkout the rest of the projects in the Ultra series:

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


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

ujson-x-1.37.tar.gz (7.1 MB view details)

Uploaded Source

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

Hashes for ujson-x-1.37.tar.gz
Algorithm Hash digest
SHA256 914469954ed0cf8965b6bdbc138f518dbaa45e2d7909f75ded633d8a7461ea31
MD5 20d02bdb976546f9d6158f1ac0e6fc81
BLAKE2b-256 4419f2b98662b4c6e43dbe9e10d87a62358aeab5e45b49ef0bef4a583bbd34db

See more details on using hashes here.

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page