These endpoints allow you to view the available language and runtime versions for the build system, and the versions configured for a specific project.

**Tip**: You can explore and test these endpoints interactively using our [OpenAPI documentation](https://api.deployhq.com/docs).

# List All Available Language Versions

Returns all available language and runtime versions from the build server.

## URL

```
/language_versions
```

## HTTP Method

```
GET
```

## Example cURL request

```bash
curl -H "Content-type: application/json" \
-H "Accept: application/json" \
--user adam@atechmedia.com:my-api-key \
https://test.deployhq.com/language_versions
```

## Example Response

```json
{
  "node": ["22", "20", "18", "16"],
  "php": ["8.4", "8.3", "8.2", "8.1", "7.4"],
  "ruby": ["3.4", "3.3", "3.2", "3.1"]
}
```

Each key is the language name, and the value is an array of available version strings sorted from newest to oldest.

# Get Project Language Versions

Returns the language versions currently configured for a specific project's default build environment.

## URL

```
/projects/<project>/language_versions
```

Replace `<project>` with either the `permalink` or `identifier` of the project.

## HTTP Method

```
GET
```

## Example cURL request

```bash
curl -H "Content-type: application/json" \
-H "Accept: application/json" \
--user adam@atechmedia.com:my-api-key \
https://test.deployhq.com/projects/my-project/language_versions
```

## Example Response

```json
{
  "node": "22",
  "php": "8.4",
  "ruby": "3.4"
}
```

Each key is the language name, and the value is the single version string configured for that project.