# Power Automate: Join Text With concat()

> For the full documentation index, see https://250highstreet.com/llms.txt

> Join two or more text values in Power Automate with concat(). Covers spaces, numbers, dates, the @{} shortcut and when to use join() for arrays.

Use the concat() expression. concat('Invoice ', 'INV-', '1042') returns Invoice INV-1042. It accepts two or more text values and returns one combined text value.

## How does concat() work?

concat(text1, text2, ...) joins the values in the order you list them and adds nothing between them. concat('Hello', 'World') returns HelloWorld.

Add a Compose action, open the Expression tab and enter the expression. You can drop dynamic content into any argument.

## How do you add a space or a separator?

Add the space as its own text argument. concat(triggerOutputs()?\['body/FirstName'\], ' ', triggerOutputs()?\['body/LastName'\]) returns a full name such as Jane Smith.

The same method works for a comma, a dash or a line break. Each separator is one more quoted argument.

## Is there a shorter way than concat()?

Yes. Microsoft documents string interpolation. Write the text as normal and wrap each expression in @{ }. For example, Invoice @{variables('Prefix')}-@{variables('Number')} gives the same result as a concat() call.

Interpolation is easier to read when you build a sentence, such as an email subject. Use concat() when you build the value inside a longer expression.

## How do you join a number or a date into text?

Convert the value to text first. Use string() for a number: concat('Total: ', string(variables('Total'))).

For a date, use formatDateTime() so you control the layout: concat('Due ', formatDateTime(utcNow(), 'yyyy-MM-dd')). The guide on [formatDateTime and time zones](/guides/power-automate-formatdatetime-mm-dd-yyyy-time-zone/) lists the format codes.

## How do you join the items of an array?

concat() joins separate values. It does not loop over an array. To turn an array into one text value with a separator, use the Join action or the join() expression.

See [the Join action](/guides/power-automate-join-action/) for the steps. If the array holds objects, run a [Select action](/guides/power-automate-select-action/) first to pull out the one field you need.

## How do you build a text value in a loop?

Create a string variable, then add an Append to string variable action inside the loop. Each pass adds one more piece of text to the end.

For a simple list of values, Select plus Join does the same job with fewer actions and no variable. Compare the options in [Compose vs variable](/guides/power-automate-compose-vs-variable/).

## What if a value is empty?

A column with no value can arrive as null, not text. To be sure each piece is text, wrap it in coalesce(value, '').

The guide on [coalesce and default values](/guides/power-automate-coalesce-default-value-null/) shows the pattern.

## FAQ

### How many values can concat() join?

Two or more. You list each value as a separate argument.

### Does concat() add a space between values?

No. Add the space yourself as a quoted argument: ' '.

### Can concat() join two arrays?

Use union() to combine arrays and remove duplicates. concat() is for text.

## Sources

- [Reference guide to workflow expression functions in Azure Logic Apps and Power Automate](https://learn.microsoft.com/en-us/azure/logic-apps/workflow-definition-language-functions-reference)
- [Use expressions in conditions in Power Automate](https://learn.microsoft.com/en-us/power-automate/use-expressions-in-conditions)

## Related guides

- [Power Automate date shows wrong day or time](/guides/power-automate-formatdatetime-mm-dd-yyyy-time-zone/)
- [Power Automate Join Action: Array to Text String](/guides/power-automate-join-action/)
- [Power Automate Select Action: Reshape an Array](/guides/power-automate-select-action/)
- [Power Automate Compose vs Variable: Which One to Use](/guides/power-automate-compose-vs-variable/)
- [Power Automate: coalesce() to Replace Null Values](/guides/power-automate-coalesce-default-value-null/)

Source: https://250highstreet.com/guides/power-automate-concat-join-text-together/