> ## Documentation Index
> Fetch the complete documentation index at: https://docs.alumio.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Array: Join into string

> Joins array items into a single string using a separator.

Use this mapper to glue all the items in a list together into one piece of text, with a separator of your choice placed between each item. It is the opposite of splitting text apart: handy for turning a list of tags into a comma-separated label, or a set of name parts into a single full name.

This documentation describes: [Schema](/schemas/mapper/list-concat)

## Fields

**Glue**

Optional

The text placed between each item when they are joined. Common choices are a comma, a space, or a dash. Leave it empty to join the items with a single space.

## Sample data

This example joins a list of tags into one comma-separated label.

| Field | Value |
| - | - |
| Glue | `, ` |

Input:

```json theme={null}
["summer", "sale", "outdoor"]
```

Output:

```json theme={null}
"summer, sale, outdoor"
```

```json Configuration theme={null}
{
  "prototype": "list-concat",
  "parameters": {
    "glue": ", "
  }
}
```


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