How to Concatenate String in Power Automate

Power Automate provides various string functions that help manipulate text values within workflows. One of the most commonly used functions is concat(), which combines multiple strings into a single value.

The concat() function is useful when creating file names, email subjects, dynamic messages, record identifiers, and custom outputs.

What is concat() Function?

The concat() function joins two or more strings together and returns a single combined string.

concat(
String1,
String2,
String3
)

Business Scenario

Suppose you need to generate a unique file name that includes a customer name and current date. Instead of manually typing the value, Power Automate can dynamically create it using the concat() function.

Example 1: Combine First Name and Last Name

concat(
'John',
' ',
'Doe'
)

Output: John Doe

Example 2: Create Dynamic File Name

concat(
'Invoice_',
formatDateTime(
utcNow(),
'yyyyMMdd'
),
'.pdf'
)

Output: Invoice_20250618.pdf

Example 3: Build Email Subject

concat(
'New Request - ',
triggerOutputs()?['body/title']
)

Using Variables

concat(
variables('FirstName'),
' ',
variables('LastName')
)

Common Use Cases

Creating file names
Building email subjects
Generating unique identifiers
Combining first and last names
Creating notification messages
Formatting output values

Important: Use concat() instead of manually combining strings to ensure dynamic values are processed correctly and consistently across your workflows.

Benefits

Simple string manipulation
Supports dynamic content
Improves workflow flexibility
Reduces manual formatting
Creates reusable expressions

Key Takeaways

concat() combines multiple strings into one value.
Supports static text and dynamic content.
Commonly used in file names, emails, and notifications.
Improves workflow automation and flexibility.
Essential function for Power Automate expressions.