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UltraJSON is an ultra fast JSON encoder and decoder written in pure C with bindings for Python 3.6+.

Install with pip:

$ python -m 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]""")
[{'key': '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("åäö")
'"\\u00e5\\u00e4\\u00f6"'
>>> ujson.dumps("åäö", ensure_ascii=False)
'"åäö"'

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 indentation (“pretty output”) is enabled. Default is 0 (disabled):

>>> ujson.dumps({"foo": "bar"})
'{"foo":"bar"}'
>>> print(ujson.dumps({"foo": "bar"}, indent=4))
{
    "foo":"bar"
}

Benchmarks

UltraJSON calls/sec compared to other popular JSON parsers with performance gain specified below each.

Test machine:

Linux 5.0.0-1032-azure x86_64 #34-Ubuntu SMP Mon Feb 10 19:37:25 UTC 2020

Versions:

  • CPython 3.8.2 (default, Feb 28 2020, 14:28:43) [GCC 7.4.0]

  • nujson : 1.35.2

  • orjson : 2.6.1

  • simplejson: 3.17.0

  • ujson : 2.0.2

ujson

nujson

orjson

simplejson

json

Array with 256 doubles

encode

22,082

4,282

76,975

5,328

5,436

decode

24,127

34,349

29,059

14,174

13,822

Array with 256 UTF-8 strings

encode

3,557

2,528

24,300

3,061

2,068

decode

2,030

2,490

931

406

358

Array with 256 strings

encode

39,041

31,769

76,403

16,615

16,910

decode

25,185

24,287

34,437

32,388

27,999

Medium complex object

encode

10,382

11,427

32,995

3,959

5,275

decode

9,785

9,796

11,515

5,898

7,200

Array with 256 True values

encode

114,341

101,039

344,256

62,382

72,872

decode

149,367

151,615

181,123

114,597

130,392

Array with 256 dict{string, int} pairs

encode

13,715

14,420

51,942

3,271

6,584

decode

12,670

11,788

12,176

6,743

8,278

Dict with 256 arrays with 256 dict{string, int} pairs

encode

50

54

216

10

23

decode

32

32

30

20

23

Dict with 256 arrays with 256 dict{string, int} pairs, outputting sorted keys

encode

46

41

8

24

Complex object

encode

533

582

408

431

decode

466

454

154

164

Metadata

Release files for ujson 4.0.1

For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.

Source distribution (sdist)

Source distribution for ujson 4.0.1
File Size Uploaded
ujson-4.0.1.tar.gz 7.1 MB Details

Built distributions (wheels)

Table of built distributions (wheels) for ujson 4.0.1
File
ujson-4.0.1-cp39-cp39-win_amd64.whl CPython 3.9 CPython 3.9 Windows x86-64 Details
ujson-4.0.1-cp39-cp39-manylinux2014_aarch64.whl CPython 3.9 CPython 3.9 Linux glibc 2.17+ ARM64 Details
ujson-4.0.1-cp39-cp39-manylinux1_x86_64.whl CPython 3.9 CPython 3.9 Linux glibc 2.5+ x86-64 Details
ujson-4.0.1-cp39-cp39-manylinux1_i686.whl CPython 3.9 CPython 3.9 Linux glibc 2.5+ x86-32 Details
ujson-4.0.1-cp39-cp39-macosx_10_14_x86_64.whl CPython 3.9 CPython 3.9 macOS 10.14+ x86-64 Details
ujson-4.0.1-cp38-cp38-win_amd64.whl CPython 3.8 CPython 3.8 Windows x86-64 Details
ujson-4.0.1-cp38-cp38-manylinux2014_aarch64.whl CPython 3.8 CPython 3.8 Linux glibc 2.17+ ARM64 Details
ujson-4.0.1-cp38-cp38-manylinux1_x86_64.whl CPython 3.8 CPython 3.8 Linux glibc 2.5+ x86-64 Details
ujson-4.0.1-cp38-cp38-manylinux1_i686.whl CPython 3.8 CPython 3.8 Linux glibc 2.5+ x86-32 Details
ujson-4.0.1-cp38-cp38-macosx_10_14_x86_64.whl CPython 3.8 CPython 3.8 macOS 10.14+ x86-64 Details
ujson-4.0.1-cp37-cp37m-win_amd64.whl CPython 3.7 CPython 3.7 pymalloc Windows x86-64 Details
ujson-4.0.1-cp37-cp37m-manylinux2014_aarch64.whl CPython 3.7 CPython 3.7 pymalloc Linux glibc 2.17+ ARM64 Details
ujson-4.0.1-cp37-cp37m-manylinux1_x86_64.whl CPython 3.7 CPython 3.7 pymalloc Linux glibc 2.5+ x86-64 Details
ujson-4.0.1-cp37-cp37m-manylinux1_i686.whl CPython 3.7 CPython 3.7 pymalloc Linux glibc 2.5+ x86-32 Details
ujson-4.0.1-cp37-cp37m-macosx_10_14_x86_64.whl CPython 3.7 CPython 3.7 pymalloc macOS 10.14+ x86-64 Details
ujson-4.0.1-cp36-cp36m-win_amd64.whl CPython 3.6 CPython 3.6 pymalloc Windows x86-64 Details
ujson-4.0.1-cp36-cp36m-manylinux2014_aarch64.whl CPython 3.6 CPython 3.6 pymalloc Linux glibc 2.17+ ARM64 Details
ujson-4.0.1-cp36-cp36m-manylinux1_x86_64.whl CPython 3.6 CPython 3.6 pymalloc Linux glibc 2.5+ x86-64 Details
ujson-4.0.1-cp36-cp36m-manylinux1_i686.whl CPython 3.6 CPython 3.6 pymalloc Linux glibc 2.5+ x86-32 Details
ujson-4.0.1-cp36-cp36m-macosx_10_14_x86_64.whl CPython 3.6 CPython 3.6 pymalloc macOS 10.14+ x86-64 Details

Total release size: 9.8 MB

Release files / ujson-4.0.1.tar.gz

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Release files / ujson-4.0.1-cp36-cp36m-macosx_10_14_x86_64.whl

Download URL ujson-4.0.1-cp36-cp36m-macosx_10_14_x86_64.whl
Size 45.4 kB
Tags CPython 3.6 CPython 3.6 pymalloc macOS 10.14+ x86-64
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5.9.0

65 release files

5.8.0

61 release files

5.5.0

65 release files

5.3.0

50 release files

5.1.0

50 release files

5.0.0

50 release files

4.3.0

44 release files

4.2.0

44 release files

4.1.0

21 release files

4.0.2

21 release files

This release

4.0.1 This release

21 release files

2.0.3

7 release files

2.0.2

7 release files

2.0.1

7 release files

2.0.0

1 release file

1.35

1 release file

1.34

2 release files

1.33

3 release files

1.30

4 release files

1.23

4 release files

1.22

4 release files

1.21

4 release files

1.19

3 release files

1.18

1 release file

1.15

1 release file

1.9

1 release file

1.8

1 release file

1.6

1 release file

1.4

1 release file

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