Using message template helpers - Amazon Pinpoint
Using variables with message template helpersUsing nested helpers

End of support notice: On October 30, 2026, AWS will end support for Amazon Pinpoint. After October 30, 2026, you will no longer be able to access the Amazon Pinpoint console or Amazon Pinpoint resources (endpoints, segments, campaigns, journeys, and analytics). For more information, see Amazon Pinpoint end of support. Note: APIs related to SMS, voice, mobile push, OTP, and phone number validate are not impacted by this change and are supported by AWS End User Messaging.

Using message template helpers

With Amazon Pinpoint templates, customers can create reusable message templates based on the Handlebars.js language. Helpers provide a variety of features like formatting a price to a specific Region's currency or adding a time zone-based location. A helper can use a specific string or integer for the value or a specific Amazon Pinpoint message variable.

These are the categories of helpers, described in the following sections:

This section describes the built-in helpers provided by Handlebars. For the full list, see Built-in Helpers at handlebarsjs.com. These are the built-in helpers:

  • each – Iterates a list.

    Note

    The maximum list size is 15 items.

  • if – Evaluates a statement.

each

Iterates a list. This helper uses only a block statement. You can optionally:

  • Pass @index in the request to reference the current loop index.

  • Use the this helper to reference the current element being iterated.

  • Return the helper response in a list, using the <li> tag.

Usage

{{#each value}}

Value at position {{@index}} is {{this}}.

{{else}}

Condition is false.

{{/each}}

each must be prefaced with a pound sign (#) and conclude with a closing {{/each}} in the block statement.

Example

In this example, each is used to return a list of a user's favorite colors. For a false, an else statement is returned. If the request is this:

{{#each User.UserAttributes.FavoriteColors}}

<li>{{this}}</li>

{{else}}

You have no favorite colors.

{{/each}} returns

  • red

  • blue

  • yellow

for a true statement.

if

Evaluates whether something is true and returns a response based on the evaluation.

Usage

{{#if value}}

Value isn't undefined

{{else}}

Value is undefined

{{/if}}

if must be prefaced with a pound sign (#) and conclude with a closing {{/if}} in the block statement.

Example

In this example, the if helper is used to evaluate whether a user's first name. If the name is found, a greeting is returned that passes the user's first name in the response. Otherwise, the else statement returns an alternative greeting.

{{#if User.UserAttributes.FirstName.[0]}}

Hello {{User.UserAttributes.FirstName.[0]}},

{{else}}

Hello,

{{/if}}

returns Hello, Jane if the if helper is true.

This section describes the conditional helpers.

Conditional helpers can be used on either a single line or in a block statement. You can customize the response regardless of which helper method you use. You can pass additional conditional helpers within both single line and block statements. The following conditional helpers show usage first for a single line and then a block statement using an optional else clause. These are the conditional helpers:

  • and – Compares whether all passed elements are equal.

  • eq – Tests whether two elements are equal.

  • gt – Tests whether one element is greater than another.

  • gte – Tests whether one element is greater than or equal to another.

  • if – Evaluates whether something is true.

  • lt – Tests whether one element is less than another.

  • lte – Tests whether one element is less than or equal to another.

  • neq – Evaluates whether two elements are not equal.

  • not – Inverts the response of a Boolean operation.

  • or – Compares whether any of the elements in the argument are equal.

and

Compares whether all elements passed in an argument are equal, and then returns the response based on the result. This helper can be used for non-Boolean values. You must pass at least two elements for the condition.

Usage

  • {{and valuea valueb valuec valued yes='y' no='n'}}

    You can replace y and n with other values, such as yes and no, or any other string you want returned, depending on the condition.

  • {{#and valuea valueb}}

    Condition is true.

    {{else}}

    Condition is false.

    {{/and}}

    and must be prefaced with a pound sign (#) and conclude with a closing {{/and}} in the block statement.

Example

In this example, eq is used within the and block statement to determine whether both strings passed for the Location.City and Location.Country attributes are true. If both conditions are equal, then a true statement is returned. If either of those attributes are false, then an else statement is returned.

{{#and (eq Location.City "Los Angeles") (eq Location.Country "US")}}

You live in Los Angeles and the US.

{{else}}

You don’t live in Los Angeles and the US.

{{/and}}

eq

Tests whether two elements are equal or if the value of one element is equal to a passed string.

Usage

  • {{eq valuea valueb yes='y' no='n'}}

    You can replace y and n with other values, such as yes and no, or any other string you want returned, depending on the condition.

  • {{#eq valuea valueb}}

    Condition is true.

    {{else}}

    Condition is false.

    {{/eq}}

    eq must be prefaced with a pound sign (#) and conclude with a closing {{/eq}} in the block statement.

Example

In this example, eq is used to evaluate whether the value of User.UserAttributes.FavoriteColors.[0] is Red. If the response is true, a true statement is returned. If the response is false, then an else statement is returned.

{{#eq User.UserAttributes.FavoriteColors.[0] "red"}}

Your favorite color is red.

{{else}}

You don't like red.

{{/eq}}

gt

Tests whether the value of one element is greater than another.

Usage

  • {{gt valuea valueb yes='y' no='n'}}

    You can replace y and n with other values, such as yes and no, or any other string you want returned, depending on the condition.

  • {{#gt valuea valueb}}

    Condition is true.

    {{else}}

    Condition is false.

    {{/gt}}

    gt must be prefaced with a pound sign (#) and conclude with a closing {{/gt}} in the block statement.

Example

In this example, the helper compares the value of User.UserAttributes.UserAge.[0] attribute against a string 17, to verify whether the user's age is greater than 17. If the response is true, a true statement is returned. If the response is false, then an else statement is returned.

{{#gt User.UserAttributes.UserAge.[0] "17"}}

You are old enough to rent a car.

{{else}}

You are not old enough to rent a car.

{{/gt}}

gte

Tests whether the value of one element is greater than or equal to another.

Usage

  • {{gte valuea valueb yes='y' no='n'}}

    You can replace y and n with other values, such as yes and no, or any other string you want returned, depending on the condition.

  • {{#gte valuea valueb}}

    Condition is true.

    {{else}}

    Condition is false.

    {{/gte}}

    get must be prefaced with a pound sign (#) and conclude with a closing {{/gte}} in the block statement.

Example

In this example, the helper compares the User.UserAttributes.UserAge.[0] attribute against a string 18, to verify whether the user's age is greater than or equal to 18. If the response is true, a true statement is returned. If the response is false, then an else statement is returned.

{{#gte User.UserAttributes.UserAge.[0] "18"}}

You are old enough to rent a car.

{{else}}

You are not old enough to rent a car.

{{/gte}}

if

Evaluates whether something is true and returns a response based on the evaluation.

Usage

  • {{#if value}}

    You can replace y and n with other values, such as yes and no, or any other string you want returned, depending on the condition.

  • {{#if value}}

    Condition is true.

    {{else}}

    Condition is false.

    {{/if}}

    if must be prefaced with a pound sign (#) and conclude with a closing {{/if}} in the block statement.

Example

In this example, the helper is used to evaluate whether a user's first name. If the name is found, a greeting is returned that passes the user's first name in the response. Otherwise, the else statement returns an alternative greeting.

{{#if User.UserAttributes.FirstName.[0]}}

Hello {{User.UserAttributes.FirstName.[0]}},

{{else}}

Hello,

{{/if}}

returns Hello Jane, if the helper is true.

lt

Tests whether the value of one element is less than the value of another.

Usage

  • {{lt valuea valueb yes='y' no='n'}}

    You can replace y and n with other values, such as yes and no, or any other string you want returned, depending on the condition.

  • {{#lt valuea valueb}}

    Condition is true.

    {{else}}

    Condition is false.

    {{/lt}}

    lt must be prefaced with a pound sign (#) and conclude with a closing {{/lt}} in the block statement.

Example

In this example, the helper compares the User.UserAttributes.UserAge.[0] attribute against a string 18 , to verify whether the user's age is less than 18. If the response is true, a true statement is returned. If the response is false, then an else statement is returned.

{{#lt User.UserAttributes.UserAge.[0] "18"}}

You are not old enough to rent a car.

{{else}}

You are old enough to rent a car.

{{/lt}}

lte

Tests whether the value of an element is less than or equal to another.

Usage

  • {{lte valuea valueb yes='y' no='n'}}

    You can replace y and n with other values, such as yes and no, or any other string you want returned, depending on the condition.

  • {{#lte valuea valueb}}

    Condition is true.

    {{else}}

    Condition is false.

    {{/lte}}

    lte must be prefaced with a pound sign (#) and conclude with a closing {{/lte}} in the block statement.

Example

In this block statement, the helper compares the User.UserAttributes.UserAge.[0] attribute against a string 17, to verify whether the user's age is equal to 17 or younger. If the response is true, a true statement is returned. If the response is false, then an else statement is returned.

{{#lte User.UserAttributes.Age.[0] "17"}}

You are not old enough to rent a car.

{{else}}

You are old enough to rent a car.

{{/lte}}

neq

Test whether two elements are not equal.

Usage

  • {{neq valuea valueb yes='y' no='n'}}

    You can replace y and n with other values, such as yes and no, or any other string you want returned, depending on the condition.

  • {{#neq valuea valueb}}

    Condition is true.

    {{else}}

    Condition is false.

    {{/neq}}

    neq must be prefaced with a pound sign (#) and conclude with a closing {{/neq}} in the block statement.

Example

In this block statement, the User.UserAttributes.FavoriteColors.[0] attribute is checked against a string Red. If the response is true, a true statement is returned. If the response is false, then an else statement is returned.

{{#neq User.UserAttributes.Favorite.Colors.[0] "red"}}

You do not like red.

{{else}}

You like red.

{{/neq}}

not

Inverts the response of a Boolean operation, so that if not is a positive comparison, then a true statement is returned. If the response is false, then an else statement is returned.

Usage

  • {{not value yes='y' no='n'}}

    You can replace y and n with other values, such as yes and no, or any other string you want returned, depending on the condition.

  • {{#not value}}

    Condition is true.

    {{else}}

    Condition is false.

    {{/not}}

    not must be prefaced with a pound sign (#) and conclude with a closing {{/not}} in the block statement.

Example

In this block statement, the User.UerAttributes.FavoriteColors.[0] attribute is checked against a string red, using the eq helper. The not helper then returns the opposite of the eq helper. If the response returns any color other than red, a true a statement is returned. If the response returns red, then an else statement is returned indicating a false statement.

{{#not (eq User.UserAttributes.Favorite.Colors.[0] "red")}}

You do not like red.

{{else}}

You like red.

{{/not}}

Example

In this example,

{{not (eq User.UserAttributes.FavoriteColors.[0] "red")}}

returns false if User.UserAttributes.FavoriteColors.[0] is red.

or

Compares whether any of the elements in the argument are equal, and then returns a response based on the result. This helper can be used for non-Boolean values.

Usage

  • {{or valuea valueb valuec valued yes='y' no='n'}}

    You can replace y and n with other values, such as yes and no, or any other string you want returned, depending on the condition. You must pass at least two elements for the condition.

  • {{#or valuea valueb}}

    Condition is true.

    {{else}}

    Condition is false.

    {{/or}}

    or must be prefaced with a pound sign (#) and conclude with a closing {{/or}} in the block statement.

Example

In this or block statement, two strings for the Location.City attribute are compared additionally using the eq helper. If either of the attributes are true, then a true statement is returned. If one or more of the responses are false, then an else statement is returned.

{{#or (eq Location.City "Los Angeles") (eq Location.City "Seattle")}}

You live on the West Coast of the United States.

{{else}}

You do not live on the West Coast of the United States.

{{/or}}

This section describes the following string helpers:

  • abbreviate – Truncates a value.

  • capitalize – Capitalizes each word between white spaces.

  • capitalizeFirst – Capitalizes the first character of a value.

  • center – Centers a value.

  • cut – Cuts a value.

  • dateFormat – Sets the date style.

  • inflect – Returns a singular or plural string based on the count.

  • join – Joins an array, iterator, or an iterable object.

  • ljust – Justifies a value to the left margin.

  • lower – Converts a value to lower case.

  • now – Prints the current date.

  • ordinalize – Ordinalizes a numeric value.

  • replace – Replaces one string with another.

  • rjust – Justifies a value to the right margin.

  • slugify – Converts a value to lower case and removes non-word characters, converts spaces to hyphens, and removes trailing white space.

  • stripTags – Strips [X]HTML tags from a value.

  • substring – Returns a new string as a substring of a passed value.

  • upper – Converts the passed value to upper case.

  • yesno – Replaces true, false, and no with Yes, No, and Maybe.

abbreviate

Truncates a value if the value exceeds the number specified. White spaces are included in the length count. An ellipsis displays in the response to indicate a truncated value. The ellipsis counts towards the truncated value in the response. This type of helper is useful if you have a large table and minimal space. Truncating values in a cell allows you to have a more uniform look to the table.

Usage

{{abbreviate value X}}, replacing X with a numeric value indicating the number of characters to keep. Negative numbers are not supported.

Example

In this example, abbreviate is used to truncate User.UserAttributes.LastName.[0] to six (6) characters. The response includes an ellipsis, the dots of which count towards the six-character total.

{{abbreviate User.UserAttributes.LastName.[0] 6}} returns

Ale... if Alejandro is the value of [0].

capitalize

Capitalizes each word between white spaces.

Usage

{{capitalize value}}

Example

In this example, initial capitalization is applied to each word for the Attributes.description.[0] entry.

{{capitalize Attributes.description.[0]}}

If Attributes.description.[0] returns

My First Post, if the value of Attributes.description.[0] is my first post.

capitalizeFirst

Capitalizes the first character in a value.

Usage

{{capitalizeFirst value}}

Example

In this example, capitalization is applied to the first character of the first word of the Attributes.description.[0] entry.

{{capitalizeFirst Attributes.description.[0]}} returns

My first post, if the value of Attributes.description.[0] is my first post.

Example

center

Centers the value in a field of a given width by the number specified. You can optionally pass a character to display for the padding or leave the field blank. If no character is passed a white space is used.

Usage

{{center value size=X [pad=" "}} , replacing X with a numeric value.

If pad is kept blank, white space is used as the padding in the response. If you pass a character, that character displays in each space of the padding. Negative numbers are not supported.

Example

In this example, the value of Location.City is centered with a size of 19.

{{center Location.City size=19}} returns

"    Los Angeles    " If Location.City is Los Angeles. Note that the quotes displayed in the example output are provided for emphasis only.

cut

Removes the specified value from a string.

Usage

{{cut value [" "]}}, replacing the space within the quotes parameter with the value to cut. If no parameter value is passed, a white space is used.

Example

This example removes the letter e from the Location.City attribute.

{{cut Location.City "e"}} returns

Los Angls if [Location.City is Los Angeles.

dateFormat

Sets the default date style for the date in any response. For a list of the time zone IDs, see https://en.wikipedia.org/wiki/List_of_tz_database_time_zones.

Usage

{{dateFormat date [inputFormat="format1"] [outputFormat="format2"] [tz=timeZoneId] [locale=localeID]}}

The format parameter must be one of:

  • "full": full date format. For example: Tuesday, September 19, 2020

  • "long": long date format. For example: September 19, 2020

  • "medium": medium date format. For example: Sept 19, 2020

  • "short": short date format. For example: 9/19/20

  • "pattern": uses a custom date pattern format. For more information about date patterns, see https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html.

"locale": uses a date format based on a given locale. For more information about locales, see https://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/LocaleUtils.html#toLocale-java.lang.String-.

If a format is not passed, then medium is used by default.

Example

In this example, the [0] entry for User.UserAttributes.StartDate.[0] is 09/19/2020 and a message is sent to a user using the full date format based on the America/Los_Angeles time zone.

We can meet with you any time on {{dateFormat User.UserAttributes.StartDate.[0] inputFormat="MM/dd/yyyy" outputFormat="full" tz=America/Los_Angeles}}. returns

We can meet with you any time on Tuesday, September 19, 2020.

inflect

Returns a singular or plural string based on the count value.

Usage

{{inflect count singular plural [includeCount=false]}}

  • Enter the singular and plural forms of the string you want to pass in the argument.

  • If includeCount is set to false, no count is returned in the response. If set to true, the count is included in the response.

Example

The following examples show the inflection for a purchase of apples, with and without includeCount.

Thank you for your purchase of {{inflect 3 apple apples includeCount=false}}. returns:

Thank you for your purchase of apples.

If includeCount is set to true, then the response is

Thank you for your purchase of 3 apples.

join

Joins an array, iterator, or an iterable object. The response returns a list, with each value in the list concatenated by the character you pass in the join. For example, you might separate values using a comma (,). The value in this helper must be a list without an attribute position index. For example, this might be Attributes.custom_attribute.

Usage

{{join value " // " [prefix=""] [suffix=""]}}

Example

In this example, a list of colors is returned, with the list separated by a comma and a space (", "):

{{join Attributes.favorite_colors ", "}} returns

blue, red, green if Attributes.favorite_colors is the list blue,red,green.

ljust

Justifies the value to the left margin and adds space to the right so that the length of the value matches the number. Negative numbers are not supported.

You can optionally pass a character to display for the pad or leave the field blank. If you leave the pad value blank, the default value is a white space.

Usage

{{ljust value size=X [pad=" "]}}, where X is the total length of the value, including white space.

Example

In this example, a left justification value of 15 is applied to the Location.City.

{{ljust Location.City size=15}} returns

"Los Angeles    " if the value of Location.City is Los Angeles. Note that the quotes displayed in the example output are provided for emphasis only.

lower

Converts a value to all lower case.

Usage

{{lower value}}

Example

In this example, the [0] entry for User.UserAttributes.LastName.[0] is changed to lower case.

{{lower User.UserAttributes.LastName.[0]}} returns

santos if Santos is the value of [0].

now

Prints out the current date based on the passed time zone ID. For a list of the time zone IDs, see https://en.wikipedia.org/wiki/List_of_tz_database_time_zones.

Usage

{{now [format="format"] [tz=timeZoneId] [locale=localeID]}}

The format parameter must be one of:

  • "full": full date format. For example: Tuesday, September 19, 2020

  • "long": long date format. For example: September 19, 2020

  • "medium": medium date format. For example: Sept 19, 2020

  • "short": short date format. For example: 9/19/20

  • "pattern": a date pattern. For more information about date patterns, see https://docs.oracle.com/javase/8/docs/api/java/text/SimpleDateFormat.html.

"locale": uses a date format based on a given locale. For more information about locales, see https://commons.apache.org/proper/commons-lang/apidocs/org/apache/commons/lang3/LocaleUtils.html#toLocale-java.lang.String-.

If a format is not passed, then medium is used by default.

Example

In this example, the current date in Los Angeles is returned with a medium format.

{{now "medium" tz=America/Los_Angeles}} returns

Sept 19, 2020.

ordinalize

Ordinalizes the numeric value passed in the argument. For example, 1 is ordinalized as 1st and 2 as 2nd. Only numeric values are supported.

Usage

{{ordinalize [number]}}

Example

In this example, the [0] entry of User.UserAttributes.UserAge is ordinalized and returned, along with a message.

Congratulations on your {{ordinalize User.UserAttributes.UserAge.[0]}} birthday! returns 22 ordinalized as 22nd.

Congratulations on your 22nd birthday!

replace

Replaces one string with another string. A string or numeric value must be literal. Wildcard characters are not supported.

Usage

{{replace stringToReplace replacementValue}}

Example

In this example, an underscore (_) replaces a white space.

{{replace Location.City " " "_"}} returns

Los_Angeles if the Location.City is Los Angeles.

rjust

Justifies the value to the right margin and adds space to the left so that the length of the value matches the number. Negative numbers are not supported.

You can optionally pass a character to display for the pad or keep the field blank. If you keep the pad value blank, the default value is a white space.

Usage

{{rjust value size=X [pad=" "]}}, where X is the total length of the value, including white space.

Example

In this example, a right justification value of 15 is applied to the Location.City attribute.

{{rjust Location.City size=15}} returns

"    Los Angeles" . if the Location.City is Los Angeles. Note that the quotes displayed in the output are provided for emphasis only.

slugify

Converts the passed value to lowercase, removes non-word characters (alphanumeric and underscore), converts spaces to hyphens, and removes any leading or trailing white space.

Usage

{{slugify value}}

Example

In this example, slugify is performed for the Location.City attribute.

{{slugify Location.City}} returns

los-angeles if Location.City is Los Angeles.

stripTags

Strips [X]HTML tags from a value.

Usage

{{stripTags value}}

Example

In this example, the HTML tags for the User.UserAttributes.interest.[0] are removed.

{{stripTags User.UserAttributes.interests.[0]}} returns

Art, if User.UserAttributes.interests.[0] is <h1>Art</h1>.

substring

Returns a new string as a substring of the passed value. The length and position are determined by the startOffset and endOffset parameters, which must be integers. Negative numbers are not supported. If an endOffset is not passed, the substring uses the original ending value of the string.

Usage

{{substring value startOffset [endOffset]}}

Example

In this example, an offset of 4 and endOffset of 9 are applied to the Location.City attribute.

{{substring Location.City 4 9}} returns

Angel if Los Angeles is the value of Location.City is Los Angeles.

upper

Converts the passed value to upper case.

Usage

{{upper value}}

Example

In this example, the [0] entry for the User.UserAttributes.LastName attribute is converted to all upper case.

{{upper User.UserAttributes.LastName.[0]}}returns

ROE if the User.UserAttributes.LastName.[0] value is Roe.

yesno

Replaces true, false, and NULL with Yes, No, and Maybe.

Usage

{{yesno value [yes="yes"] [no="no"] maybe=["maybe"]}}

Example

In this example, the IsUserSubscribed attribute returns whether a user is subscribed to a particular list.

{{yesno Attributes.IsUserSubscribed}} returns

yes if Attributes.IsUserSubscribed is true.

This section describes the math and encoding helpers.

  • add – Returns the sum of two numbers.

  • ceiling – Rounds an integer to its mathematical ceiling.

  • decode64 – Decodes a base64 encoded value to a string.

  • divide – Returns the quotient of two numbers.

  • encode64 – Encodes a string using base64.

  • floor – Rounds an integer to its mathematical floor.

  • md5 – Hashes a passed string using the MD5 algorithm.

  • modulo – Returns the remainder of two numbers using floating points.

  • multiply – Returns the product of two numbers.

  • round – Rounds a decimal to the nearest whole number.

  • sha256 – Hashes a passed string using SHA-256.

  • sha512 – Hashes a passed string using SHA-512.

  • subtract – Returns the difference of two numbers.

  • uuid – Randomly generates a UUID in a 128-bit format.

add

Returns the sum of two numbers along with floating points.

Usage

{{add arg1 arg2}}

Example

{{add 5 2.3}} returns

7.3

ceiling

Rounds an integer to its mathematical ceiling, which is the highest whole number closest to the passed value.

Usage

{{ceiling value}}

Example

{{ceiling 5.23}} returns

6

decode64

Decodes a base64 encoded value to a string.

Usage

{{decode64 "string"}}

Example

{{decode64 "SGVsbG8gd29ybGQ="}} returns

Hello World

divide

Returns the quotient of two numbers, including floating points.

Usage

{{divide arg1 arg2}}

Example

{{divide 5 2.3}} returns

2.17391304

encode64

Encodes the string passed in the argument using base64.

Usage

{{encode64 "string"}}

Example

{{encode64 "Hello World"}}

SGVsbG8gd29ybGQ=

floor

Rounds an integer to its mathematical floor, which is the lowest whole number closest to the passed value.

Usage

{{floor value}}

Example

{{floor 5.23}} returns

5

md5

Hashes a passed string using the MD5 algorithm.

Usage

{{md5 "string"}}

Example

{{md5 "Hello World"}}

3e25960a79dbc69b674cd4ec67a72c62

modulo

Returns the remainder of two numbers using floating points.

Usage

{{modulo arg1 arg2}}

Example

{{modulo 7 2}} returns

1

multiply

Returns the product of two numbers, with any floating points.

Usage

{{multiply arg1 arg2}}

Example

{{multiply 5 2.3}} returns

11.5

round

Rounds a decimal place up or down to the nearest whole number.

Usage

{{round value}}

Example

You spent an average of {{round 19.21}} minutes on our website each day. returns:

You spent an average of 19 minutes on our website each day.

sha256

Hashes a passed string using SHA-256 cryptographic security.

Usage

{{sha256 "string"}}

Example

{{sha256 "Hello World"}} returns

a591a6d40bf420404a011733cfb7b190d62c65bf0bcda32b57b277d9ad9f146e

sha512

Hashes a passed string using SHA-512 cryptographic security.

Usage

{{sha512 "string"}}

Example

{{sha512 "Hello World"}} returns

2c74fd17edafd80e8447b0d46741ee243b7eb74dd2149a0ab1b9246fb30382f27e853d8585719e0e67cbda0daa8f51671064615d645ae27acb15bfb1447f459b

subtract

Returns the difference of two numbers, with any floating points.

Usage

{{subtract arg1 arg2}}

Example

{{subtract 5 2.3}} returns

2.7

uuid

Randomly generates a UUID in a standard 128-bit format. No value needs to be passed in the argument.

Usage

{{uuid}}

Example

{{uuid}} returns

95f36680-152c-4052-99ec-cc3cdf7ca594

While technically not a helper, inline partials are Handlebars way to streamline templates that include repeated strings, which is better for reuse. For more information, see Inline partials at handlebarsjs.com.

Usage

{{#* inline "inlineName"}}Content to reuse{{/inline}}

To reference the content of the inline partial elsewhere, use:

{{> inlineName}}

Example

The following example creates an inline partial that includes the recipient's first name, and, if it's available, last name, by adding the following code to the beginning of the template:

{{#* inline "fullName"}}

{{User.UserAttributes.FirstName.[0]}} {{#if User.UserAttributes.LastName.[0]}} {{User.UserAttributes.LastName.[0]}} {{/if}}

{{/inline}}

After creating the fullName partial, you can include it anywhere in your template by preceding the name of the partial with a > (greater than) symbol, followed by a space, as in the following example: {{> fullName}}.

Hello {{> fullName}}

returns the user's first and last name if true – for example, Hello Jane Doe. Otherwise, if no last name is found, Hello Jane is returned.

Handlebars include additional features beyond those documented here. For more information, see handlebarsjs.com.

Using variables with message template helpers

Amazon Pinpoint custom attributes, such as User.UserAttributes.LastName, are stored as a list, regardless of whether there's a single item or multiple items. When passing a list in a helper that expects a string, you must specify the attribute index value along with the attribute name. This attribute index value indicates the position of a value from the attribute list: .[0] for the first entry in the list, .[1] for the second, .[2] for the third, and so on. For example, let's say you're using the upper helper to convert the first ([0]) entry of User.UserAttributes.LastName to all upper case. The helper usage is {{upper value}}, and the attribute formatted as User.UserAttributes.LastName. Replace value with the attribute name and attribute index value .[0] as follows: {{upper User.UserAttributes.LastName.[0]}}. The response then returns the [0] entry from the list, formatted in all upper case. For example, if the value of [0] is Santos, the response returns SANTOS.

Amazon Pinpoint custom attributes names support spaces. To have a custom attribute called "Last Name", you must format the attribute as User.UserAttributes.[Last Name]. To access the first entry in the attribute index list the format is User.UserAttributes.[Last Name].[0].

A custom attribute name can contain up to 50 characters. An attribute value can contain up to 100 characters. When you define the name of a custom attribute, avoid using the following characters: number sign (#), colon (:), question mark (?), backslash (\), and slash (/). The Amazon Pinpoint console can't display attribute names that contain these characters. This restriction doesn't apply to attribute values.

Using nested helpers

You can nest multiple message template helpers within each other. The following example shows how to format two helpers: {{ first helper (second helper)}}. The second helper is processed first, followed by the first helper. Remember that the first helper always determines the output. Subsequent helpers must be nested within the previous helper as follows: {{ first helper (second helper (third helper) )}}.

The following example shows how to nest two helpers to change JANE to Jane: {{capitalizeFirst (lower "JANE")}}. lower first converts JANE to jane. Then capitalizeFirst converts jane to Jane.