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Expressions

Expressions allow you to define dynamic values in your template.

They are used to:

  • insert data into the document
  • transform values
  • perform calculations
  • control formatting

Expressions are used throughout the template editor — for example in text, form fields, dynamic images, and file names.

How it works​

An expression combines different elements:

  • values (numbers or text)
  • variables (input data)
  • operators (e.g. +, >)
  • functions (e.g. CONCAT, DATE)

Example:

CONCAT("Hello ", name)

This expression combines static text with a variable.

Variables​

Variables represent input data.

Examples:

Name
email
UnitPrice
order_number

You can also access nested data using dot notation:

Address.City

Numbers​

Numbers use a simple format:

123
123.456

The decimal part is optional.

Operators​

Operators allow you to perform calculations and comparisons.

Examples:

quantity * price
price > 50

Functions​

Functions allow you to transform and format data.

Examples:

CONCAT("INV", NUM(invoiceNumber, 4))
DATE(TODAY(), "yyyy-MM-dd")

Types​

Expressions support different data types:

  • string
  • number
  • boolean
  • date
  • array

The type is automatically inferred based on how the value is used.

Example:

A + 3

This forces A to be treated as a number.

When to use Expressions​

Use expressions when you need to:

  • combine values
  • format numbers or dates
  • generate dynamic text
  • derive new values from input data

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