Handlebars helper reference

Every Restorm expression is a Handlebars template: URL, header, parameter, request body, Expression-typed environment variable, scenario field, the Transform template action’s template.

This page lists 116 named helpers and 22 dynamic variables.

Ctrl+Space triggers autocompletion in the fields that support it.

A variable beats a helper

If a name exists both as a variable and as a helper, {{min}} with no argument reads the variable, while {{min a b}} with arguments calls the helper. A sub-expression (min a b) always calls the helper.

Templates are also compiled without HTML escaping: an & or a < inside a value passes through intact, which is what you want for JSON or XML.

Comparison (15)

Helper	Signature	Effect
eq	{{eq a b}}	a === b
ne	{{ne a b}}	a !== b
neq	{{neq a b}}	Alias of ne
lt	{{lt a b}}	a < b (numeric)
lte	{{lte a b}}	a <= b
gt	{{gt a b}}	a > b
gte	{{gte a b}}	a >= b
and	{{#and a b}}…{{else}}…{{/and}}	Block: every argument truthy
or	{{#or a b}}…{{/or}}	Block: at least one argument truthy
not	{{not value}}	Negation
ifEquals	{{#ifEquals a b}}…{{else}}…{{/ifEquals}}	Block, strict equality
is	{{#is a b}}…{{/is}}	Block, comparison as strings
isnt	{{#isnt a b}}…{{/isnt}}	Block, difference as strings
default	{{default value fallback}}	value if defined, otherwise fallback
compare	{{#compare a "op" b}}…{{/compare}}	Block; op ∈ == === != !== < <= > >=

{{default region "eu-west-1"}}
{{#compare quantite ">" 100}}gros{{else}}normal{{/compare}}

Strings (37)

Helper	Signature	Example → result
lowercase	{{lowercase s}}	Hello → hello
uppercase	{{uppercase s}}	Hello → HELLO
capitalize	{{capitalize s}}	hello there → Hello there
capitalizeAll	{{capitalizeAll s}}	hello there → Hello There
titleize	{{titleize s}}	Identical to capitalizeAll
camelcase	{{camelcase s}}	my-field → myField
pascalcase	{{pascalcase s}}	my-field → MyField
snakecase	{{snakecase s}}	myField → my_field
snakeCase	{{snakeCase s}}	Alias of snakecase
dashcase	{{dashcase s}}	myField → my-field
dotcase	{{dotcase s}}	myField → my.field
pathcase	{{pathcase s}}	myField → my/field
sentencecase	{{sentencecase s}}	HELLO THERE → Hello there
slugify	{{slugify s}}	My Fine Title! → my-fine-title
trim	{{trim s}}	Strips whitespace from both ends
trimLeft	{{trimLeft s}}	From the left
trimRight	{{trimRight s}}	From the right
replace	{{replace s search replacement}}	Replaces every occurrence (literal, no regex)
split	{{split s separator}}	Splits into an array; separator , by default
truncate	{{truncate s length suffix}}	Length 50 and suffix ... by default
ellipsis	{{ellipsis s length}}	Like truncate with …
append	{{append s suffix}}	Concatenates at the end
prepend	{{prepend s prefix}}	Concatenates at the start
reverse	{{reverse value}}	Reverses a string or an array
startsWith	{{#startsWith s prefix}}…{{/startsWith}}	Block
endsWith	{{#endsWith s suffix}}…{{/endsWith}}	Block
contains	{{#contains stringOrArray value}}…{{/contains}}	Block
match	{{match s pattern}}	Every match, or null
test	{{#test s pattern}}…{{/test}}	Block, regular expression test
padStart	{{padStart s length character}}	Pads on the left
padEnd	{{padEnd s length character}}	Pads on the right
repeat	{{repeat s n}}	Repeats
substring	{{substring s start end}}	Extracts
indexOf	{{indexOf s search}}	Position, or -1
count	{{count s substring}}	Number of occurrences
newLineToBr	{{newLineToBr s}}	\n → <br>
stripTags	{{stripTags s}}	Strips <…> tags

{{slugify nomProduit}}
{{padStart numeroCommande 8 "0"}}
{{truncate description 120}}

Maths (19)

Helper	Signature	Effect
add	{{add a b}}	Sum
subtract	{{subtract a b}}	Difference
multiply	{{multiply a b}}	Product
divide	{{divide a b}}	Quotient
modulo	{{modulo a b}}	Remainder
abs	{{abs a}}	Absolute value
ceil	{{ceil a}}	Rounded up
floor	{{floor a}}	Rounded down
round	{{round a}}	Rounded
pow	{{pow base exponent}}	Power
sqrt	{{sqrt a}}	Square root
random	{{random min max}}	Random integer, bounds included
sum	{{sum array}}	Sum of an array
avg	{{avg array}}	Average
min	{{min a b c …}}	Minimum, variadic
max	{{max a b c …}}	Maximum, variadic
toFixed	{{toFixed number decimals}}	A string with N decimal places
toInt	{{toInt number}}	Integer (base 10), 0 as a fallback
toFloat	{{toFloat number}}	Float, 0 as a fallback

{"montantTTC": {{toFixed (multiply montantHT 1.2) 2}}}

Arrays (18)

Helper	Signature	Effect
first	{{first array n}}	The first element, or the first n
last	{{last array n}}	The last, or the last n
length	{{length value}}	The length of an array or a string, or a number of keys
join	{{join array separator}}	Separator , by default
sort	{{sort array}}	A sorted copy
unique	{{unique array}}	De-duplicates
after	{{after array n}}	Everything after index n
before	{{before array n}}	Everything before index n
slice	{{slice array start end}}	A portion
concat	{{concat a b …}}	Concatenates, flattening one level
flatten	{{flatten array}}	Flattens one level
pluck	{{pluck array property}}	Extracts one property from every element
itemAt	{{itemAt array index}}	The element at that index; a negative index counts from the end
inArray	{{#inArray array value}}…{{/inArray}}	Block
isArray	{{isArray value}}	Boolean
isEmpty	{{#isEmpty value}}…{{/isEmpty}}	Block
some	{{#some array prop value}}…{{/some}}	Block: at least one element matches
every	{{#every array prop value}}…{{/every}}	Block: every element matches

{{join (pluck articles "reference") ","}}

Objects (12)

Helper	Signature	Effect
JSONstringify	{{JSONstringify obj}}	Serialises, indent 2
JSONparse	{{JSONparse string}}	Parses; {} on failure
get	{{get obj "a.b.c"}}	Reads by dotted path
isObject	{{isObject value}}	Boolean (non-null, non-array)
typeOf	{{typeOf value}}	null, array, or the JavaScript type
keys	{{keys obj}}	The keys
values	{{values obj}}	The values
entries	{{entries obj}}	The [key, value] pairs
hasOwn	{{#hasOwn obj "key"}}…{{/hasOwn}}	Block
pick	{{pick obj "k1" "k2"}}	Keeps only those keys
omit	{{omit obj "k1"}}	Removes those keys
merge	{{merge o1 o2}}	Shallow merge

{{get reponse "data.client.identifiant"}}

URL (5)

Helper	Signature	Effect
encodeURI	{{encodeURI s}}	Encodes a URL component
decodeURI	{{decodeURI s}}	Decodes
urlParse	{{urlParse url}}	{ href, origin, protocol, host, hostname, port, pathname, search, hash }, or null
stripQuerystring	{{stripQuerystring url}}	Strips the query string
stripProtocol	{{stripProtocol url}}	Strips the scheme

{{baseUrl}}/recherche?q={{encodeURI termeRecherche}}

Dates (4)

Helper	Signature	Effect
year	{{year}}	The current year
now	{{now}}	The current moment, in ISO form
timestamp	{{timestamp}}	The current moment, in milliseconds
formatDate	{{formatDate date "YYYY-MM-DD"}}	Formats

formatDate is deliberately minimal

Only the YYYY, MM, DD, HH, mm, ss tokens are recognised, each replaced once only, in local time. Default pattern: YYYY-MM-DD. An invalid date renders an empty string.

For date arithmetic or richer formatting, use the Date math scenario action or a code action — moment is provided.

Note too that {{timestamp}} is in milliseconds whereas {{$timestamp}} (Postman compatibility, below) is in seconds.

Miscellaneous (6)

Helper	Signature	Effect
coalesce	{{coalesce a b c}}	The first non-null value
uuid	{{uuid}}	A UUID v4
noop	{{#noop}}…{{/noop}}	A block with no effect
raw	{{{{raw}}}}…{{{{/raw}}}}	Does not interpret the content
times	{{#times n}}…{{/times}}	Repeats the block; @index, @first, @last available
range	{{range start end step}}	An array of numbers, end excluded

The raw helper is what you need when you are sending double braces deliberately — for instance to test a service that interprets them itself.

Dynamic variables (Postman compatibility) (22)

Argument-less, with a different value on every evaluation.

Variable	Returns
{{$guid}}	A UUID v4
{{$randomUUID}}	A UUID v4
{{$timestamp}}	The current moment, in seconds
{{$isoTimestamp}}	The current moment, in ISO form
{{$randomInt}}	An integer from 0 to 1000
{{$randomAlphaNumeric}}	8 alphanumeric characters
{{$randomBoolean}}	true or false
{{$randomFirstName}}	A first name
{{$randomLastName}}	A surname
{{$randomFullName}}	A full name
{{$randomUserName}}	firstname.surname<0-99>
{{$randomEmail}}	An email address
{{$randomColor}}	A colour name
{{$randomWord}}	A word
{{$randomWords}}	Three words
{{$randomCompanyName}}	A company name
{{$randomCity}}	A city
{{$randomCountry}}	A country
{{$randomPhoneNumber}}	A phone number
{{$randomIP}}	An IP address
{{$randomIPV4}}	An IPv4 address
{{$randomPrice}}	A price with two decimal places

{
  "correlationId": "{{$guid}}",
  "client": { "nom": "{{$randomFullName}}", "email": "{{$randomEmail}}" },
  "emisLe": "{{$isoTimestamp}}"
}

Note

The values are drawn from short, fixed lists: this is filler data, not a realistic data generator. An unknown {{$random…}} variable stays unresolved and renders an empty string, with no error.

For a reproducible draw, use the Random scenario action with its seed.

Reaching environment variables

There is no variable-access helper: variables are directly in the context. You write {{baseUrl}}, not {{env "baseUrl"}}.

See Variables and environments.