Template functions

Home Assistant extends the Jinja2 template engine with many custom functions, filters, and tests. Each one has its own page with detailed descriptions, parameters, and practical examples.

New to templates? Start with the templating documentation to learn the basics.

Areas

These template functions let you work with the areas you've set up in Home Assistant. Look up which entities or devices belong to an area, get area names and IDs, and build automations that operate on entire rooms at once.

Get devices in an area area_devices Returns a list of device IDs associated with a given area.
Get entities in an area area_entities Returns a list of entity IDs associated with a given area.
Get area ID area_id Returns the area ID for a given area name, entity ID, or device ID.
Get area name area_name Returns the friendly name of an area from its ID, entity ID, or device ID.
Get all areas areas Returns a list of all area IDs in your Home Assistant instance.

Collections

These template functions help you work with collections of data: lists, sets, dictionaries, and JSON. Use them to combine, filter, sort, and reshape data from your entities, API responses, and incoming messages.

Get object attribute attr Reads an attribute from an object when the attribute name comes from a variable.
Split list into batches batch Splits a list into smaller batches of a specified size.
Merge dictionaries combine Merges multiple dictionaries into one.
Sort a dictionary dictsort Sorts a dictionary by its keys or values, returning a list of key/value pairs.
Set difference difference Returns items in the first list but not in the second (set difference).
Get first item first Returns the first item of a list or the first character of a string.
Flatten nested lists flatten Flattens nested lists into a single flat list.
Parse JSON string from_json Parses a JSON string into a Python object.
Group items by attribute groupby Groups a list of items by a common attribute, producing a list of (grouper, list) pairs.
Set intersection intersect Returns items common to both lists (set intersection).
Get dictionary key/value pairs items Returns the key/value pairs from a dictionary as a list of tuples.
Get last item last Returns the last item of a list or the last character of a string.
Get length of a collection length Returns the number of items in a list, characters in a string, or keys in a dictionary. Also available as count.
Transform list items map Applies a filter to each item or extracts an attribute from each item in a list.
Merge action responses merge_response Merges action response dictionaries into a flat list.
Remove items by test reject Filters a list, removing items that pass a given test. The opposite of select.
Remove items by attribute test rejectattr Filters a list, removing items where a specified attribute passes a test. The opposite of selectattr.
Reverse a list or string reverse Reverses the order of items in a list or characters in a string.
Filter items by test select Filters a list, keeping only items that pass a given test.
Filter items by attribute test selectattr Filters a list, keeping only items where a specified attribute passes a test.
Convert to set set Converts an iterable to a set, removing duplicate values.
Randomly shuffle a list shuffle Randomly shuffles the items in a list.
Slice a list into sub-lists slice Slices a list into a specified number of sub-lists of roughly equal size.
Sort a list sort Sorts the items in a list, with optional attribute-based and reverse sorting.
Sum values in a list sum Sums all values in a list, with optional attribute extraction and start value.
Set symmetric difference symmetric_difference Returns items in either list but not in both.
Serialize to JSON to_json Serializes a value to a JSON string.
Convert to tuple tuple Converts an iterable to a tuple.
Set union union Returns all unique items from both lists (set union).
Remove duplicate values unique Removes duplicate values from a list, keeping only unique items.

Comparison

These template tests let you compare values in your templates. Use them inside if conditions and filters to check equality, order, or membership.

Test equality eq Tests if two values are equal. Also known as equalto or ==.
Test greater than or equal ge Tests if a value is greater than or equal to another. Also known as >=.
Test greater than gt Tests if a value is greater than another. Also known as greaterthan or >.
Test less than or equal le Tests if a value is less than or equal to another. Also known as <=.
Test less than lt Tests if a value is less than another. Also known as lessthan or <.
Test not equal ne Tests if two values are not equal. Also known as !=.

Date & Time

These template functions help you work with dates, times, and durations. Use them to get the current time, format timestamps for display, calculate how long ago something happened, or convert between different time representations.

Convert to datetime as_datetime Converts a string or timestamp to a datetime object.
Convert to local time zone as_local Converts a datetime object to your local time zone.
Parse duration string as_timedelta Parses an ISO 8601 duration string into a timedelta object.
Convert to UNIX timestamp as_timestamp Converts a datetime object or string to a UNIX timestamp.
Current local date and time now Returns the current date and time in your local time zone.
Relative time (deprecated) relative_time Returns a human-readable string describing how long ago a datetime was.
Parse a time string strptime Parses a time string with a specified format into a datetime object.
Human-readable time elapsed time_since Returns a human-readable string describing how much time has passed since a datetime.
Human-readable time remaining time_until Returns a human-readable string describing how much time remains until a datetime.
Create a time duration timedelta Creates a timedelta object from numeric time components.
Format timestamp with custom format timestamp_custom Formats a UNIX timestamp as a string using a custom format.
Format timestamp as local time timestamp_local Formats a UNIX timestamp as a local datetime string.
Format timestamp as UTC time timestamp_utc Formats a UNIX timestamp as a UTC datetime string.
Today at a specific time today_at Returns today's date combined with a specific time.
Current UTC date and time utcnow Returns the current date and time in UTC.

Devices

These template functions let you work with devices in Home Assistant. Look up device names, IDs, attributes, and find which entities belong to a device.

Get device attribute device_attr Returns the value of a specific attribute from a device.
Get entities for a device device_entities Returns a list of entity IDs associated with a given device.
Get a device ID device_id Returns the device ID for a given entity ID or device name.
Get a device name device_name Returns the name of a device from a device ID or entity ID.
Test device attribute is_device_attr Tests if a specific attribute of a device has a given value.

Encoding

These template functions encode, decode, and hash data. Use them to turn bytes into readable text, generate checksums, or prepare data for APIs that expect a specific encoding.

Decode from base64 base64_decode Decodes a base64-encoded string.
Encode to base64 base64_encode Encodes a string or bytes to a base64 string.
Decode hex string to bytes from_hex Decodes a hexadecimal string into bytes.
MD5 hash md5 Calculates the MD5 hash of a string.
Pack value to bytes pack Packs a value into bytes using a Python struct format string.
SHA1 hash sha1 Calculates the SHA1 hash of a string.
SHA256 hash sha256 Calculates the SHA256 hash of a string.
SHA512 hash sha512 Calculates the SHA512 hash of a string.
Unpack bytes to value unpack Unpacks bytes into a value using a Python struct format string.

Entities

These template functions let you work with entities in Home Assistant. Get entity names, check visibility, and look up which integration or config entry an entity belongs to.

Get config entry attribute config_entry_attr Gets a specific attribute from a config entry.
Get config entry ID config_entry_id Gets the config entry ID from an entity ID.
Get entity name entity_name Gets the friendly name of an entity from its entity ID.
Get entities for an integration integration_entities Returns a list of entity IDs tied to an integration or config entry.
Test if entity is hidden is_hidden_entity Tests if an entity is hidden in the entity registry.

Floors

These template functions let you work with floors in Home Assistant. Look up floor names and IDs, find which areas belong to a floor, and get all entities across an entire floor.

Get areas on a floor floor_areas Returns a list of area IDs that belong to a given floor.
Get entities on a floor floor_entities Returns a list of entity IDs for all entities on a given floor.
Get floor ID floor_id Returns the floor ID for a given floor name, area name, device ID, or entity ID.
Get floor name floor_name Returns the friendly name of a floor from its ID, area name, device ID, or entity ID.
Get all floors floors Returns a list of all floor IDs in your Home Assistant instance.

Functional

These template functions help with control flow, conditional logic, and general utility operations. They let you make decisions, transform values, and work with data in flexible ways.

Call a function dynamically apply Calls a function with a value, letting you pass any function into places where a filter is expected.
Turn a macro into a function as_function Turns a template macro into a reusable function you can pass to map, select, and reject.
Check if value contains another contains Tests if a value contains another value. Works with strings, lists, and dictionaries.
Cycle through values cycler Creates an object that cycles through a list of values. Useful for alternating between values in a loop.
Create a dictionary dict Creates a dictionary from keyword arguments.
Immediate if (ternary) iif Shorthand for basic if/else logic in a single expression.
Join loop iterations joiner Creates a helper that joins loop iterations with a separator, returning an empty string on the first call.
Generate placeholder text lipsum Generates lorem ipsum placeholder text. Useful for testing and prototyping templates.
Create a mutable namespace namespace Creates a mutable namespace object for storing variables across loop scopes in templates.
Unicode code point ord Returns the Unicode code point for a single character.
Choose a random value random Chooses a random value from a list. Returns a different value each time the template is evaluated.
Generate a number sequence range Generates a sequence of numbers, like Python's range(). Commonly used for looping a specific number of times.
Parse a version string version Converts a string into a version object that supports comparison operators.
Combine iterables zip Zips multiple iterables together into a list of tuples, pairing elements by position.

Labels

These template functions let you work with labels in Home Assistant. Labels are tags you can assign to entities, devices, and areas to organize them. Use these functions to look up labels, find items with specific labels, and build automations that act on labeled groups of items.

Get areas with a label label_areas Returns a list of area IDs that have a specific label assigned.
Get label description label_description Returns the description of a label from its ID.
Get devices with a label label_devices Returns a list of device IDs that have a specific label assigned.
Get entities with a label label_entities Returns a list of entity IDs that have a specific label assigned.
Get label ID label_id Returns the label ID for a given label name.
Get label name label_name Returns the friendly name of a label from its ID.
Get all labels labels Returns a list of all label IDs, or the labels assigned to a specific entity, device, or area.

Math

These template functions provide mathematical operations for your templates. From basic arithmetic helpers to trigonometry, statistics, and value constraining, they let you perform calculations on sensor data, averages across rooms, and more.

Absolute value abs Returns the absolute value of a number.
Arc cosine (inverse cosine) acos Returns the arc cosine (inverse cosine) of a value, in radians.
Arc sine (inverse sine) asin Returns the arc sine (inverse sine) of a value, in radians.
Arc tangent (inverse tangent) atan Returns the arc tangent (inverse tangent) of a value, in radians.
Four-quadrant arc tangent atan2 Returns the four-quadrant arc tangent of y/x, in radians.
Average (arithmetic mean) average Calculates the arithmetic mean of a list of values.
Bitwise AND bitwise_and Performs a bitwise AND operation on two values.
Bitwise OR bitwise_or Performs a bitwise OR operation on two values.
Bitwise XOR bitwise_xor Performs a bitwise XOR (exclusive OR) operation on two values.
Clamp (constrain) a value clamp Constrains a value between a minimum and maximum bound.
Cosine cos Returns the cosine of a value given in radians.
Test if divisible by divisibleby Tests whether a number is divisible by another number.
Euler's number e The mathematical constant e (Euler's number), approximately 2.71828.
Test if even even Tests whether a number is even.
Logarithm log Returns the logarithm of a value with an optional base (default is natural logarithm).
Maximum value max Returns the largest value from a list of values.
Statistical median median Calculates the statistical median (middle value) of a list of values.
Minimum value min Returns the smallest value from a list of values.
Test if odd odd Tests whether a number is odd.
Pi pi The mathematical constant pi, approximately 3.14159.
Remap a value between ranges remap Remaps a value from one numeric range to another, with optional stepping and edge handling.
Sine sin Returns the sine of a value given in radians.
Square root sqrt Returns the square root of a value.
Statistical mode statistical_mode Returns the most commonly occurring value in a list of values.
Tangent tan Returns the tangent of a value given in radians.
Tau tau The mathematical constant tau (2 * pi), approximately 6.28318.
Wrap a value cyclically wrap Wraps a value cyclically within a range.

Regex

These template functions let you search, match, and transform text with regular expressions. Use them when you need to extract specific parts of a string, validate formats, or replace patterns in sensor values.

Test if string matches pattern match Template test that checks if a string matches a regular expression at the beginning.
Find all regex matches regex_findall Finds all occurrences of a regular expression pattern in a string and returns them as a list.
Find regex match at index regex_findall_index Finds all occurrences of a regex pattern and returns the match at a specific index.
Match a regex pattern regex_match Tests if a string matches a regular expression pattern at the beginning.
Replace using a regex pattern regex_replace Replaces all occurrences of a regular expression pattern in a string.
Search for a regex pattern regex_search Searches for a regular expression pattern anywhere in a string.
Test if string contains pattern search Template test that checks if a string contains a regular expression pattern anywhere.

Repairs

These template functions let you read the repair issues Home Assistant has flagged. Use them to build dashboards or notifications that surface problems needing your attention.

Get a specific repair issue issue Returns a specific repair issue by domain and issue ID, or None if it does not exist.
Get all repair issues issues Returns all active repair issues currently open in Home Assistant.

States

These template functions let you access and check the states of your entities. They are the foundation of most template logic in Home Assistant, letting you read sensor values, check if devices are on or off, and react to changes in your smart home.

Find closest entity closest Finds the entity closest to a given location, home, or another entity.
Calculate distance distance Calculates the distance in kilometers between two points or from home.
Expand groups into entities expand Expands groups and zones into a sorted list of individual entity state objects.
Check if entity has a value has_value Tests if an entity exists and has a valid state (not unavailable or unknown).
Test entity state is_state Tests if an entity is in a specific state.
Test state attribute is_state_attr Tests if a specific attribute of an entity has a given value.
Get state attribute state_attr Returns the value of a specific attribute from an entity's state.
Get translated attribute value state_attr_translated Returns the translated value of a specific attribute from an entity's state.
Get translated state state_translated Returns the translated state value of an entity in your configured language.
Get entity state states Returns the state value of an entity, or lets you iterate over all entity states.

Strings

These template functions help you format, transform, and shape text. Use them to build friendly messages, clean up sensor values, or prepare text for dashboards and notifications.

Capitalize first character capitalize Capitalizes the first character of a string and lowercases the rest.
Center text in a field center Centers a string in a field of a given width, padding with spaces.
Escape HTML characters escape Escapes HTML special characters in a string so they display as literal text.
Format byte size as human-readable filesizeformat Formats a byte count as a human-readable file size string like 1.2 MB.
Force-escape HTML characters forceescape Escapes HTML special characters, even on strings already marked as safe.
Printf-style string formatting format Formats a string using printf-style placeholders like %s, %d, and %f.
Indent text indent Indents text by a given number of spaces, with options for the first line and blank lines.
Join a list into a string join Joins a list of values into a single string with a separator between each element.
Convert to lowercase lower Converts all characters in a string to lowercase.
Convert number to ordinal ordinal Converts a number to its ordinal string representation (1st, 2nd, 3rd, and so on).
Pretty-print a value pprint Pretty-prints a value in a readable format, useful for debugging templates.
Replace occurrences in a string replace Replaces all occurrences of a substring with another string.
Mark as safe HTML safe Marks a string as safe HTML so it will not be escaped when rendered.
Convert to slug format slugify Converts a string to a slug format with an optional separator character.
Strip HTML tags striptags Removes all HTML/XML tags from a string, leaving only the text content.
Convert to title case title Converts a string to title case, capitalizing the first letter of each word.
Strip whitespace trim Strips leading and trailing whitespace (or specified characters) from a string.
Truncate text to a length truncate Truncates a string to a given length, appending an ellipsis if it was shortened.
Convert to uppercase upper Converts all characters in a string to uppercase.
URL-encode a value urlencode URL-encodes a dictionary of values for use in HTTP requests.
Convert URLs to HTML links urlize Converts plain text URLs into HTML links.
Count words in text wordcount Counts the number of words in a string.
Wrap text at a line width wordwrap Wraps text at a given line width by inserting line breaks.
Convert dictionary to HTML attributes xmlattr Converts a dictionary into an XML/HTML attribute string.

Type Conversion

These template functions convert values between text, numbers, and other types, and let you check what type a value currently is. Use them whenever you need to turn sensor states into numbers for math, or verify the shape of data before acting on it.

Add to a value add Adds a specified amount to a numeric value, with an optional default if conversion fails.
Convert to boolean bool Converts a value to a boolean (true/false), with an optional default if conversion fails.
Test if boolean boolean Tests whether a value is a boolean type.
Test if callable callable Tests whether a value is callable (a function or method).
Set a default value default Provides a default value if a variable is undefined or none.
Test if defined defined Tests whether a variable is defined (not undefined).
Test if false false Tests whether a value is false.
Convert to float float Converts a value to a floating-point number, with an optional default if conversion fails.
Test if float float Tests whether a value is a floating-point number type.
Test if in sequence in Tests whether a value is contained in a sequence.
Convert to integer int Converts a value to an integer, with an optional default if conversion fails.
Test if integer integer Tests whether a value is an integer type.
Require a value is defined is_defined Forces a template error if the value is undefined, ensuring variables exist before use.
Test if value is numeric is_number Tests whether a value can be converted to a finite number.
Test if iterable iterable Tests whether a value is iterable.
Convert to list list Converts a value to a list.
Test if mapping mapping Tests whether a value is a mapping (dictionary).
Multiply a value multiply Multiplies a numeric value by a specified amount, with an optional default if conversion fails.
Test if none none Tests whether a value is None.
Test if number number Tests whether a value is a number (integer or float).
Round a number round Rounds a numeric value to a specified number of decimal places using various rounding methods.
Test same object sameas Tests whether a value is the same object as another (identity check).
Test if sequence sequence Tests whether a value is a sequence (list, tuple, or string).
Convert to string string Converts a value to its string representation.
Test if string string Tests whether a value is a string type.
Serialize to JSON tojson Serializes a value to a JSON-formatted string.
Test if true true Tests whether a value is true.
Get the type of a value typeof Returns the type name of a value as a string.
Test if undefined undefined Tests whether a variable is undefined.

abs - Returns the absolute value of a number.

acos - Returns the arc cosine (inverse cosine) of a value, in radians.

add - Adds a specified amount to a numeric value, with an optional default if conversion fails.

apply - Calls a function with a value, letting you pass any function into places where a filter is expected.

area_devices - Returns a list of device IDs associated with a given area.

area_entities - Returns a list of entity IDs associated with a given area.

area_id - Returns the area ID for a given area name, entity ID, or device ID.

area_name - Returns the friendly name of an area from its ID, entity ID, or device ID.

areas - Returns a list of all area IDs in your Home Assistant instance.

as_datetime - Converts a string or timestamp to a datetime object.

as_function - Turns a template macro into a reusable function you can pass to map, select, and reject.

as_local - Converts a datetime object to your local time zone.

as_timedelta - Parses an ISO 8601 duration string into a timedelta object.

as_timestamp - Converts a datetime object or string to a UNIX timestamp.

asin - Returns the arc sine (inverse sine) of a value, in radians.

atan - Returns the arc tangent (inverse tangent) of a value, in radians.

atan2 - Returns the four-quadrant arc tangent of y/x, in radians.

attr - Reads an attribute from an object when the attribute name comes from a variable.

average - Calculates the arithmetic mean of a list of values.

base64_decode - Decodes a base64-encoded string.

base64_encode - Encodes a string or bytes to a base64 string.

batch - Splits a list into smaller batches of a specified size.

bitwise_and - Performs a bitwise AND operation on two values.

bitwise_or - Performs a bitwise OR operation on two values.

bitwise_xor - Performs a bitwise XOR (exclusive OR) operation on two values.

bool - Converts a value to a boolean (true/false), with an optional default if conversion fails.

boolean - Tests whether a value is a boolean type.

callable - Tests whether a value is callable (a function or method).

capitalize - Capitalizes the first character of a string and lowercases the rest.

center - Centers a string in a field of a given width, padding with spaces.

clamp - Constrains a value between a minimum and maximum bound.

closest - Finds the entity closest to a given location, home, or another entity.

combine - Merges multiple dictionaries into one.

config_entry_attr - Gets a specific attribute from a config entry.

config_entry_id - Gets the config entry ID from an entity ID.

contains - Tests if a value contains another value. Works with strings, lists, and dictionaries.

cos - Returns the cosine of a value given in radians.

cycler - Creates an object that cycles through a list of values. Useful for alternating between values in a loop.

default - Provides a default value if a variable is undefined or none.

defined - Tests whether a variable is defined (not undefined).

device_attr - Returns the value of a specific attribute from a device.

device_entities - Returns a list of entity IDs associated with a given device.

device_id - Returns the device ID for a given entity ID or device name.

device_name - Returns the name of a device from a device ID or entity ID.

dict - Creates a dictionary from keyword arguments.

dictsort - Sorts a dictionary by its keys or values, returning a list of key/value pairs.

difference - Returns items in the first list but not in the second (set difference).

distance - Calculates the distance in kilometers between two points or from home.

divisibleby - Tests whether a number is divisible by another number.

e - The mathematical constant e (Euler's number), approximately 2.71828.

entity_name - Gets the friendly name of an entity from its entity ID.

eq - Tests if two values are equal. Also known as equalto or ==.

escape - Escapes HTML special characters in a string so they display as literal text.

even - Tests whether a number is even.

expand - Expands groups and zones into a sorted list of individual entity state objects.

false - Tests whether a value is false.

filesizeformat - Formats a byte count as a human-readable file size string like 1.2 MB.

first - Returns the first item of a list or the first character of a string.

flatten - Flattens nested lists into a single flat list.

float - Converts a value to a floating-point number, with an optional default if conversion fails.

float - Tests whether a value is a floating-point number type.

floor_areas - Returns a list of area IDs that belong to a given floor.

floor_entities - Returns a list of entity IDs for all entities on a given floor.

floor_id - Returns the floor ID for a given floor name, area name, device ID, or entity ID.

floor_name - Returns the friendly name of a floor from its ID, area name, device ID, or entity ID.

floors - Returns a list of all floor IDs in your Home Assistant instance.

forceescape - Escapes HTML special characters, even on strings already marked as safe.

format - Formats a string using printf-style placeholders like %s, %d, and %f.

from_hex - Decodes a hexadecimal string into bytes.

from_json - Parses a JSON string into a Python object.

ge - Tests if a value is greater than or equal to another. Also known as >=.

groupby - Groups a list of items by a common attribute, producing a list of (grouper, list) pairs.

gt - Tests if a value is greater than another. Also known as greaterthan or >.

has_value - Tests if an entity exists and has a valid state (not unavailable or unknown).

iif - Shorthand for basic if/else logic in a single expression.

in - Tests whether a value is contained in a sequence.

indent - Indents text by a given number of spaces, with options for the first line and blank lines.

int - Converts a value to an integer, with an optional default if conversion fails.

integer - Tests whether a value is an integer type.

integration_entities - Returns a list of entity IDs tied to an integration or config entry.

intersect - Returns items common to both lists (set intersection).

is_defined - Forces a template error if the value is undefined, ensuring variables exist before use.

is_device_attr - Tests if a specific attribute of a device has a given value.

is_hidden_entity - Tests if an entity is hidden in the entity registry.

is_number - Tests whether a value can be converted to a finite number.

is_state - Tests if an entity is in a specific state.

is_state_attr - Tests if a specific attribute of an entity has a given value.

issue - Returns a specific repair issue by domain and issue ID, or None if it does not exist.

issues - Returns all active repair issues currently open in Home Assistant.

items - Returns the key/value pairs from a dictionary as a list of tuples.

iterable - Tests whether a value is iterable.

join - Joins a list of values into a single string with a separator between each element.

joiner - Creates a helper that joins loop iterations with a separator, returning an empty string on the first call.

label_areas - Returns a list of area IDs that have a specific label assigned.

label_description - Returns the description of a label from its ID.

label_devices - Returns a list of device IDs that have a specific label assigned.

label_entities - Returns a list of entity IDs that have a specific label assigned.

label_id - Returns the label ID for a given label name.

label_name - Returns the friendly name of a label from its ID.

labels - Returns a list of all label IDs, or the labels assigned to a specific entity, device, or area.

last - Returns the last item of a list or the last character of a string.

le - Tests if a value is less than or equal to another. Also known as <=.

length - Returns the number of items in a list, characters in a string, or keys in a dictionary. Also available as count.

lipsum - Generates lorem ipsum placeholder text. Useful for testing and prototyping templates.

list - Converts a value to a list.

log - Returns the logarithm of a value with an optional base (default is natural logarithm).

lower - Converts all characters in a string to lowercase.

lt - Tests if a value is less than another. Also known as lessthan or <.

map - Applies a filter to each item or extracts an attribute from each item in a list.

mapping - Tests whether a value is a mapping (dictionary).

match - Template test that checks if a string matches a regular expression at the beginning.

max - Returns the largest value from a list of values.

md5 - Calculates the MD5 hash of a string.

median - Calculates the statistical median (middle value) of a list of values.

merge_response - Merges action response dictionaries into a flat list.

min - Returns the smallest value from a list of values.

multiply - Multiplies a numeric value by a specified amount, with an optional default if conversion fails.

namespace - Creates a mutable namespace object for storing variables across loop scopes in templates.

ne - Tests if two values are not equal. Also known as !=.

none - Tests whether a value is None.

now - Returns the current date and time in your local time zone.

number - Tests whether a value is a number (integer or float).

odd - Tests whether a number is odd.

ord - Returns the Unicode code point for a single character.

ordinal - Converts a number to its ordinal string representation (1st, 2nd, 3rd, and so on).

pack - Packs a value into bytes using a Python struct format string.

pi - The mathematical constant pi, approximately 3.14159.

pprint - Pretty-prints a value in a readable format, useful for debugging templates.

random - Chooses a random value from a list. Returns a different value each time the template is evaluated.

range - Generates a sequence of numbers, like Python's range(). Commonly used for looping a specific number of times.

regex_findall - Finds all occurrences of a regular expression pattern in a string and returns them as a list.

regex_findall_index - Finds all occurrences of a regex pattern and returns the match at a specific index.

regex_match - Tests if a string matches a regular expression pattern at the beginning.

regex_replace - Replaces all occurrences of a regular expression pattern in a string.

regex_search - Searches for a regular expression pattern anywhere in a string.

reject - Filters a list, removing items that pass a given test. The opposite of select.

rejectattr - Filters a list, removing items where a specified attribute passes a test. The opposite of selectattr.

relative_time - Returns a human-readable string describing how long ago a datetime was.

remap - Remaps a value from one numeric range to another, with optional stepping and edge handling.

replace - Replaces all occurrences of a substring with another string.

reverse - Reverses the order of items in a list or characters in a string.

round - Rounds a numeric value to a specified number of decimal places using various rounding methods.

safe - Marks a string as safe HTML so it will not be escaped when rendered.

sameas - Tests whether a value is the same object as another (identity check).

search - Template test that checks if a string contains a regular expression pattern anywhere.

select - Filters a list, keeping only items that pass a given test.

selectattr - Filters a list, keeping only items where a specified attribute passes a test.

sequence - Tests whether a value is a sequence (list, tuple, or string).

set - Converts an iterable to a set, removing duplicate values.

sha1 - Calculates the SHA1 hash of a string.

sha256 - Calculates the SHA256 hash of a string.

sha512 - Calculates the SHA512 hash of a string.

shuffle - Randomly shuffles the items in a list.

sin - Returns the sine of a value given in radians.

slice - Slices a list into a specified number of sub-lists of roughly equal size.

slugify - Converts a string to a slug format with an optional separator character.

sort - Sorts the items in a list, with optional attribute-based and reverse sorting.

sqrt - Returns the square root of a value.

state_attr - Returns the value of a specific attribute from an entity's state.

state_attr_translated - Returns the translated value of a specific attribute from an entity's state.

state_translated - Returns the translated state value of an entity in your configured language.

states - Returns the state value of an entity, or lets you iterate over all entity states.

statistical_mode - Returns the most commonly occurring value in a list of values.

string - Converts a value to its string representation.

string - Tests whether a value is a string type.

striptags - Removes all HTML/XML tags from a string, leaving only the text content.

strptime - Parses a time string with a specified format into a datetime object.

sum - Sums all values in a list, with optional attribute extraction and start value.

symmetric_difference - Returns items in either list but not in both.

tan - Returns the tangent of a value given in radians.

tau - The mathematical constant tau (2 * pi), approximately 6.28318.

time_since - Returns a human-readable string describing how much time has passed since a datetime.

time_until - Returns a human-readable string describing how much time remains until a datetime.

timedelta - Creates a timedelta object from numeric time components.

timestamp_custom - Formats a UNIX timestamp as a string using a custom format.

timestamp_local - Formats a UNIX timestamp as a local datetime string.

timestamp_utc - Formats a UNIX timestamp as a UTC datetime string.

title - Converts a string to title case, capitalizing the first letter of each word.

to_json - Serializes a value to a JSON string.

today_at - Returns today's date combined with a specific time.

tojson - Serializes a value to a JSON-formatted string.

trim - Strips leading and trailing whitespace (or specified characters) from a string.

true - Tests whether a value is true.

truncate - Truncates a string to a given length, appending an ellipsis if it was shortened.

tuple - Converts an iterable to a tuple.

typeof - Returns the type name of a value as a string.

undefined - Tests whether a variable is undefined.

union - Returns all unique items from both lists (set union).

unique - Removes duplicate values from a list, keeping only unique items.

unpack - Unpacks bytes into a value using a Python struct format string.

upper - Converts all characters in a string to uppercase.

urlencode - URL-encodes a dictionary of values for use in HTTP requests.

urlize - Converts plain text URLs into HTML links.

utcnow - Returns the current date and time in UTC.

version - Converts a string into a version object that supports comparison operators.

wordcount - Counts the number of words in a string.

wordwrap - Wraps text at a given line width by inserting line breaks.

wrap - Wraps a value cyclically within a range.

xmlattr - Converts a dictionary into an XML/HTML attribute string.

zip - Zips multiple iterables together into a list of tuples, pairing elements by position.