terraform/website/docs/configuration/functions/join.html.md

---
layout: "functions"
page_title: "join - Functions - Configuration Language"
sidebar_current: "docs-funcs-string-join"
description: |-
  The join function produces a string by concatenating the elements of a list
  with a given delimiter.
---

# `join` Function

-> **Note:** This page is about Terraform 0.12 and later. For Terraform 0.11 and
earlier, see
[0.11 Configuration Language: Interpolation Syntax](../../configuration-0-11/interpolation.html).

`join` produces a string by concatenating together all elements of a given
list of strings with the given delimiter.

```hcl
join(separator, list)
```

## Examples

```
> join(", ", ["foo", "bar", "baz"])
foo, bar, baz
> join(", ", ["foo"])
foo
```

## Related Functions

* [`split`](./split.html) performs the opposite operation: producing a list
  by separating a single string using a given delimiter.