> For the complete documentation index, see [llms.txt](https://docs.yarnspinner.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.yarnspinner.dev/3.1/api/csharp/yarn.compiler/yarn.compiler.project/yarn.compiler.project.baselanguage.md).

# BaseLanguage

Property in [Project](/3.1/api/csharp/yarn.compiler/yarn.compiler.project.md)

## Summary

Gets or sets the base language of the project, as an IETF BCP-47 language tag.

```csharp
public string BaseLanguage { get; set; }
```

## Remarks

The base language is the language that the Yarn scripts is written in.