List of Jinja Builtin Functions

abs

method: abs(number)

Return the absolute value of the argument.

{{ -1|abs }}|{{ 1|abs }}
# => 1

attr

method: attr(obj, name)

Get an attribute of an object. foo|attr("bar") works like foo.bar just that always an attribute is returned and items are not looked up.

{{ foo|attr('bar') }}
# => 'quux'

batch

method: batch(sequence, linecount, fill_with=None)

A filter that batches items. It works pretty much like slice just the other way round. It returns a list of lists with the given number of items. If you provide a second parameter this is used to fill up missing items.

{{ foo|batch(3)|list }}
# => [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9]]

{{ foo|batch(3, 'X')|list }}
# => [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 'X', 'X']]

capitalize

method: capitalize(string)

Capitalize a string. The first character will be uppercase, all others lowercase.

{{ "foo bar"|capitalize }}
# => 'Foo bar'

center

method: center(value, width=80)

Centers the value in a field of a given width.

{{ "foo"|center(9) }}
# => '   foo   '

default

method: default(value, default_value=u'', boolean=False)

aliases: d

If the value is undefined it will return the passed default value, otherwise the value of the variable

{{ missing|default('no') }}
# => 'no'

{{ false|default('no') }}
# => 'false'

{{ false|default('no', true) }}
# => 'no'

{{ given|default('no') }}
# => 'yes'

dictsort

method: dictsort(dict, case_sensitive=False, by='key')

Sort a dict and yield (key, value) pairs. Because python dicts are unsorted you may want to use this function to order them by either key or value

{{ {"aa": 0, "b": 1, "c": 2, "AB": 3}|dictsort }}
# => [('aa', 0), ('AB', 3), ('b', 1), ('c', 2)]

{{ {"aa": 0, "b": 1, "c": 2, "AB": 3}|dictsort(true) }}
# => [('AB', 3), ('aa', 0), ('b', 1), ('c', 2)]

{{ {"aa": 0, "b": 1, "c": 2, "AB": 3}|dictsort(false, "value") }}
# => [('aa', 0), ('b', 1), ('c', 2), ('AB', 3)]

escape

method: escape(string)

aliases: e

Convert the characters &, <, >, ‘, and ” in string s to HTML-safe sequences. Use this if you need to display text that might contain such characters in HTML. Marks return value as markup string.

{{ '<">&'|escape }}
# => '&lt;&#34;&gt;&amp;'

filesizeformat

method: filesizeformat(number, binary=False)

Format the value like a ‘human-readable’ file size (i.e. 13 kB, 4.1 MB, 102 Bytes, etc). Per default decimal prefixes are used (Mega, Giga, etc.), if the second parameter is set to True the binary prefixes are used (Mebi, Gibi).

{{ 100|filesizeformat }}
# => 100 Bytes

{{ 1000|filesizeformat }}
# => 1.0 kB

{{ 1000000|filesizeformat }}
# => 1.0 MB

{{ 1000000000|filesizeformat }}
# => 1.0 GB

{{ 1000000000000|filesizeformat }}
# => 1.0 TB

{{ 100|filesizeformat(true) }}
# => 100 Bytes

{{ 1000|filesizeformat(true) }}
# => 1000 Bytes

{{ 1000000|filesizeformat(true) }}
# => 976.6 KiB

{{ 1000000000|filesizeformat(true) }}
# => 953.7 MiB

{{ 1000000000000|filesizeformat(true) }}
# => 931.3 GiB

first

method: first(sequence)

Return the first item of a sequence.

{{ list(range(10))|first }}
# => 0

float

method: float(string, default=0.0) => string

Convert the value into a floating point number. If the conversion doesn’t work it will return 0.0. You can override this default using the first parameter.

{{ "42"|float }}
# => 42.0

{{ "ajsghasjgd"|float }}
# => 0.0

{{ "32.32"|float }}
# => 32.32

forceescape

method: forceescape(string) => string

Enforce HTML escaping. This will probably double escape variables.

{{ '<div />'|forceescape }}
# => '&lt;div /&gt;'

format

method: format(string, *args, **kwargs) => string

Apply python string formatting on an object:

{{ "%s - %s"|format("Hello?", "Foo!") }}
# => Hello? - Foo!

groupby

method: groupby(value, attribute)

Group a sequence of objects by a common attribute.

[{'foo': 1, 'bar': 2},{'foo': 2, 'bar': 3},{'foo': 1, 'bar': 1},{'foo': 3, 'bar': 4}]|groupby('foo')
# => "1: 1, 2: 1, 1|2: 2, 3|3: 3, 4|"

[('a', 1), ('a', 2), ('b', 1)]|groupby(0)
# => 'a:1:2|b:1|'

indent

method: indent(string, width=4, indentfirst=False)

Return a copy of the passed string, each line indented by 4 spaces. The first line is not indented. If you want to change the number of spaces or indent the first line too you can pass additional parameters to the filter

{{ 'indent by two spaces and indent the first line too.'|indent(2, true) }}
# => '  indent by two spaces and indent the first line too.'

int

method: int(value, default=0, base=10)

Convert the value into an integer. If the conversion doesn’t work it will return 0. You can override this default using the first parameter. You can also override the default base (10) in the second parameter, which handles input with prefixes such as 0b, 0o and 0x for bases 2, 8 and 16 respectively.

{{ "42"|int }}
# => 42

{{ "ajsghasjgd"|int }}
# => 0

{{ "32.32"|int }}
# => 32

{{ "0x4d32"|int(0, 16) }}
# => 19762

{{ "011"|int(0, 8)}}
# => 9

{{ "0x33FU"|int(0, 16) }}
# => 0

join

method: join(value, delimiter='', attribute=None)

Return a string which is the concatenation of the strings in the sequence. The separator between elements is an empty string per default, you can define it with the optional parameter. It is also possible to join certain attributes of an object

{{ [1, 2, 3]|join('|') }}
# => 1|2|3

{{ [1, 2, 3]|join }}
# => 123

{{ map(User, ['foo', 'bar']))|join(', ', attribute='username') }}
# => 'foo, bar'

last

method: last(sequence)

Return the last item of a sequence.

{{ list(range(10))|last }}
# => 9

length

method: length(object)

aliases: count

Return the number of items of a sequence or mapping.

{{ "hello world"|length }}
# => 11

list

method: list(value)

Convert the value into a list. If it was a string the returned list will be a list of characters.

{{ "hello"|list }}
# => ['H', 'e', 'l', 'l', 'o']

lower

method: lower(string)

Convert a value to lowercase.

{{ "FOO"|lower }}
# => 'foo'

map

method: map() => list

Applies a filter on a sequence of objects or looks up an attribute. This is useful when dealing with lists of objects but you are really only interested in a certain value of it.

The basic usage is mapping on an attribute. Imagine you have a list of users but you are only interested in a list of usernames:

{{ [User('john'), User('jane'), User('mike')]|map(attribute="name")|join(",") }}
# => 'john,jane,mike'

Alternatively you can let it invoke a filter by passing the name of the filter and the arguments afterwards. A good example would be applying a text conversion filter on a sequence:

{{ ['John', 'Jane', 'Mike']| map('lower') | join(', ') }}
# => 'john, jane, mike'

New in jinja version 2.7.

pprint

method: pprint(value, verbose=False)

Pretty print a variable. Useful for debugging.

With Jinja 1.2 onwards you can pass it a parameter. If this parameter is truthy the output will be more verbose (this requires pretty)

{{[(0, {'a': 'A', 'c': 'C', 'b': 'B', 'e': 'E', 'd': 'D', 'g': 'G', 'f': 'F', 'h': 'H'}), (1, {'a': 'A', 'c': 'C', 'b': 'B', 'e': 'E', 'd': 'D', 'g': 'G', 'f': 'F', 'h': 'H'}), (2, {'a': 'A', 'c': 'C', 'b': 'B', 'e': 'E', 'd': 'D', 'g': 'G', 'f': 'F', 'h': 'H'})] | pprint }}
# => [(0,
#  {'a': 'A',
#   'b': 'B',
#   'c': 'C',
#   'd': 'D',
#   'e': 'E',
#   'f': 'F',
#   'g': 'G',
#   'h': 'H'}),
# (1,
#  {'a': 'A',
#   'b': 'B',
#   'c': 'C',
#   'd': 'D',
#   'e': 'E',
#   'f': 'F',
#   'g': 'G',
#   'h': 'H'}),
# (2,
#  {'a': 'A',
#   'b': 'B',
#   'c': 'C',
#   'd': 'D',
#   'e': 'E',
#   'f': 'F',
#   'g': 'G',
#   'h': 'H'})]

random

method: random(sequence)

Return a random item from the sequence.

{{ ['John', 'Jane', 'Mike'] | random }}
# => 'Jane'

{{ ['John', 'Jane', 'Mike'] | random }}
# => 'Mike'

reject

method: reject()

Filters a sequence of objects by applying a test to the object and rejecting the ones with the test succeeding.

{{ [1, 2, 3, 4, 5]|reject("odd")|join("|") }}
# => '2|4'

New in jinja version 2.7.

rejectattr

method: rejectattr()

Filters a sequence of objects by applying a test to an attribute of an object or the attribute and rejecting the ones with the test succeeding.

{{ [User('john', True), User('jane', True), User('mike', False)]|rejectattr("is_active")|map(attribute="name") }}
# => 'mike'

New in jinja version 2.7.

replace

method: replace(haystack, neddle, substitute, count=None)

Return a copy of the value with all occurrences of a substring replaced with a new one. The first argument is the substring that should be replaced, the second is the replacement string. If the optional third argument count is given, only the first count occurrences are replaced:

{{ "Hello World"|replace("Hello", "Goodbye") }}
# => Goodbye World

{{ "aaaaargh"|replace("a", "d'oh, ", 2) }}
# => d'oh, d'oh, aaargh

reverse

method: reverse(value)

Reverse the object or return an iterator that iterates over it the other way round.

{{ "foobar"|reverse|join }} | {{ [1, 2, 3]|reverse|list }}
# => 'raboof|[3, 2, 1]'

round

method: round(value, precision=0, method='common')

Round the number to a given precision. The first parameter specifies the precision (default is 0), the second the rounding method:

'common' rounds either up or down
'ceil' always rounds up
'floor' always rounds down

If you don’t specify a method 'common' is used.

{{ 42.55|round }}
# => 43.0

{{ 42.55|round(1, 'floor') }}
# => 42.5

Note that even if rounded to 0 precision, a float is returned. If you need a real integer, pipe it through int:

{{ 42.55|round|int }}
# => 43

safe

method: safe(value)

Mark the value as safe which means that in an environment with automatic escaping enabled this variable will not be escaped.

{{ "<div>foo</div>"|safe }}
# => '<div>foo</div>'

{{ "<div>foo</div>" }}
# => '&lt;div&gt;foo&lt;/div&gt;'

select

method: select()

Filters a sequence of objects by applying a test to the object and only selecting the ones with the test succeeding.

{{ [1, 2, 3, 4, 5]|select("odd")|join("|") }}
# => '1|3|5'

New in jinja version 2.7.

selectattr

method: selectattr()

Filters a sequence of objects by applying a test to an attribute of an object and only selecting the ones with the test succeeding.

{{ [User('john', True), User('jane', True), User('mike', False)]|selectattr("is_active")|map(attribute="name") }}
# => 'john|jane'

New in jinja version 2.7.

slice

method: slice(value, slices, fill_with=None)

Slice an iterator and return a list of lists containing those items.

{{ list(range(10))|slice(3)|list }}
# => [[0, 1, 2, 3], [4, 5, 6], [7, 8, 9]]

{{ list(range(10))|slice(3, "X")|list }}
# => [[0, 1, 2, 3], [4, 5, 6, 'X'], [7, 8, 9, 'X']]

If you pass it a second argument it’s used to fill missing values on the last iteration.

sort

method: sort(value, reverse=False, case_sensitive=False, attribute=None)

Sort an iterable. Per default it sorts ascending, if you pass it true as first argument it will reverse the sorting.

If the iterable is made of strings the third parameter can be used to control the case sensitiveness of the comparison which is disabled by default.

{{ [2, 3, 1]|sort }}
# => [1, 2, 3]

{{ [2, 3, 1]|sort(true) }}
# => [3, 2, 1]

{{ "".join(["c", "A", "b", "D"]|sort) }}
# => 'AbcD'

{{ ['foo', 'Bar', 'blah']|sort }}
# => "['Bar', 'blah', 'foo']"

Changed in jinja version 2.6: The attribute parameter was added.

string

method: string(object)

Make a string unicode if it isn’t already. That way a markup string is not converted back to unicode.

{{ [1, 2, 3, 4, 5]|string }}
# => '12345'

striptags

method: striptags(value)

Strip SGML/XML tags and replace adjacent whitespace by one space.

{{ '<p>just a small   \n <a href="#">example</a> link</p>\n<p>to a webpage</p><!-- <p>and some commented stuff</p> -->|striptags }}
# => 'just a small example link to a webpage'

sum

method: sum(iterable, attribute=None, start=0)

Returns the sum of a sequence of numbers plus the value of parameter ‘start’ (which defaults to 0). When the sequence is empty it returns start.

It is also possible to sum up only certain attributes:

{{ [1, 2, 3, 4, 5, 6]|sum }}
# => '21'

Changed in version 2.6: The attribute parameter was added to allow suming up over attributes. Also the start parameter was moved on to the right.

title

method: title(string)

Return a titlecased version of the value. I.e. words will start with uppercase letters, all remaining characters are lowercase.

{{ "foo bar"|title }}
# => "Foo Bar"

{{ "foo's bar"|title }}
# => Foo's Bar"

{{ "foo   bar"|title }}
# => "Foo   Bar"

{{ "f bar f"|title }}
# => "F Bar F"

{{ "foo-bar"|title }}
# => "Foo-Bar"

{{ "foo\tbar"|title }}
# => "Foo\tBar"

{{ "FOO\tBAR"|title }}
# => "Foo\tBar"

trim

method: trim(value)

Strip leading and trailing whitespace.

{{ "  foo bar"|trim }}
# => "foo bar"

{{ "  foo bar  "|trim }}
# => "foo bar"

{{ "foo bar  "|trim }}
# => "foo bar"

truncate

method: truncate(string, length=255, killwords=False, end='...')

Return a truncated copy of the string. The length is specified with the first parameter which defaults to 255. If the second parameter is true the filter will cut the text at length. Otherwise it will discard the last word. If the text was in fact truncated it will append an ellipsis sign ("..."). If you want a different ellipsis sign than "..." you can specify it using the third parameter.

{{ "foo bar baz"|truncate(9) }}
# => "foo ..."

{{ "foo bar baz"|truncate(9, True) }}
# => "foo ba..."

upper

method: upper(string)

Convert a value to uppercase.

{{ "foo"|upper }}
# => "FOO"

urlencode

method: urlencode(value)

Escape strings for use in URLs (uses UTF-8 encoding). It accepts both dictionaries and regular strings as well as pairwise iterables.

{{ "Hello, world!"|urlencode }}
# => 'Hello%2C%20world%21'

{{ "Hello, world\u203d"|urlencode }}
# => "Hello%2C%20world%E2%80%BD"

{{ ("f", 1),)"|urlencode }}
# => "f=1"

{{ (('f', 1), ("z", 2)) |urlencode }}
# => "f=1&amp;z=2"

New in version 2.7.

urlize

method: urlize(value, trim_url_limit=None, nofollow=False, target=None)

Converts URLs in plain text into clickable links.

If you pass the filter an additional integer it will shorten the urls to that number. Also a third argument exists that makes the urls “nofollow”:

{{ "foo http://www.example.com/ bar"|urlize }}
# => 'foo <a href="http://www.example.com/">http://www.example.com/</a> bar'

 '{{ "foo http://www.example.com/ bar"|urlize(target="_blank") }}'
# => 'foo <a href="http://www.example.com/" target="_blank">http://www.example.com/</a> bar'

Changed in version 2.8+: The target parameter was added.

wordcount

method: wordcount(string)

Count the words in that string.

{{ "foo bar baz"|wordcount }}
# => 3

wordwrap

method: wordwrap(string, width=79, break_long_words=True, wrapstring=None)

Return a copy of the string passed to the filter wrapped after 79 characters. You can override this default using the first parameter. If you set the second parameter to false Jinja will not split words apart if they are longer than width. By default, the newlines will be the default newlines for the environment, but this can be changed using the wrapstring keyword argument.

# todo: supply example?

New in version 2.7: Added support for the wrapstring parameter.

xmlattr

method: xmlattr(dict, autospace=True)

Create an SGML/XML attribute string based on the items in a dict. All values that are neither none nor undefined are automatically escaped:

{{ {'class': 'my_list', 'missing': none, 'id': 'list-%d'|format('42')}|xmlattr }}
# => class="my_list" id="list-42"

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List of Jinja Builtin Functions

abs

method: abs(number)

attr

method: attr(obj, name)

batch

method: batch(sequence, linecount, fill_with=None)

capitalize

method: capitalize(string)

center

method: center(value, width=80)

default

method: default(value, default_value=u'', boolean=False)

dictsort

method: dictsort(dict, case_sensitive=False, by='key')

escape

method: escape(string)

filesizeformat

method: filesizeformat(number, binary=False)

first

method: first(sequence)

float

method: float(string, default=0.0) => string

forceescape

method: forceescape(string) => string

format

method: format(string, *args, **kwargs) => string

groupby

method: groupby(value, attribute)

indent

method: indent(string, width=4, indentfirst=False)

int

method: int(value, default=0, base=10)

join

method: join(value, delimiter='', attribute=None)

last

method: last(sequence)

length

method: length(object)

list

method: list(value)

lower

method: lower(string)

map

method: map() => list

pprint

method: pprint(value, verbose=False)

random

method: random(sequence)

reject

method: reject()

rejectattr

method: rejectattr()

replace

method: replace(haystack, neddle, substitute, count=None)

reverse

method: reverse(value)

round

method: round(value, precision=0, method='common')

safe

method: safe(value)

select

method: select()

selectattr

method: selectattr()

slice

method: slice(value, slices, fill_with=None)

sort

method: sort(value, reverse=False, case_sensitive=False, attribute=None)

string

method: string(object)

striptags

method: striptags(value)

sum