typeOf helper

The typeOf helper returns the JavaScript type of a given value as a lowercase string. Use it to identify whether a field contains a number, string, array, or object before applying type-dependent logic in a flow.

Syntax

{{typeOf value}}

value -- The value to evaluate. Required.

Return values

Examples

Check the types of common field values

{{typeOf record.age}}
{{typeOf record.flag}}
{{typeOf record.firstName}}
{{typeOf record.items}}
{{typeOf record.note}}

Input:

{
 "record": {
 "age": 25,
 "flag": true,
 "firstName": "Alice",
 "items": [{ "sku": "ITEM001", "quantity": 2 }],
 "note": null
 }
}

Output:

number
boolean
string
array
object

record.note is null, which returns object -- a known behavior of JavaScript's type system.

Use typeOf in a conditional block

{{#compare (typeOf record.value) "===" "number"}}
 Formatting as number
{{else}}
 Formatting as string
{{/compare}}

If record.value is a number, the first branch renders. For any other type, the {{else}} branch renders.

Usage notes

• typeOf always returns a lowercase string: number, string, boolean, array, object, or undefined.
• null returns object, not null -- this is a known behavior of JavaScript's type system.
• Use typeOf inside #compare to build conditional logic based on field type.
• To check specifically whether a value is an array, compare the typeOf result to "array". isArray is a #some condition name, not a separate helper.

Related articles

• isTruthy helper
• isFalsey helper
• #compare block helper
• Handlebars helper reference