n8n-docs/docs/code/builtin/data-transformation-functions/index.md

title	description	contentType
Data transformation functions	Introduction to data transformation functions for expressions.	overview

Data transformation functions

Data transformation functions are helper functions to make data transformation easier in expressions.

/// note | JavaScript in expressions You can use any JavaScript in expressions. Refer to Expressions for more information. /// For a list of available functions, refer to the page for your data type:

• Arrays
• Dates
• Numbers
• Objects
• Strings

Usage

Data transformation functions are available in the expressions editor.

The syntax is:

{{ dataItem.function() }}

For example, to check if a string is an email:

{{ "example@example.com".isEmail() }}

// Returns true