> For the complete documentation index, see [llms.txt](https://vostok.gitbook.io/configuration/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://vostok.gitbook.io/configuration/advanced-scenarios/use-name-aliases.md).

# Use name aliases

**Requires**: [abstractions module](/configuration/modules/abstractions.md).

Name aliases provide alternative keys to look for in [settings nodes](/configuration/concepts-and-basics/settings-nodes.md) when performing [binding](/configuration/concepts-and-basics/binding-nodes-to-models.md).

They can be applied to fields and properties with a special attribute:

```
class MySettings 
{
    [Alias("LegacyTimeout")]
    public TimeSpan Timeout { get; }
}

// The property can be initialized from either "timeout" or "legacytimeout" key
```

It's allowed to assign multiple aliases to a single member:

```
[Alias("alias1")]
[Alias("alias2")]
public TimeSpan Timeout { get; }
```

**Aliases do not handle ambiguity**. If the source returns data with more than one of the lookup keys assigned to a field or property, binding fails with an error.

```
Ambiguous data examples:
{ "timeout": "...", "alias1": "..." }
{ "alias1": "...", "alias2": "..." }
```

### Related pages

{% content-ref url="/pages/-M6UQlGKGPuVt1P3lsHf" %}
[Binding nodes to models](/configuration/concepts-and-basics/binding-nodes-to-models.md)
{% endcontent-ref %}

{% content-ref url="/pages/-M6UUbY8BakIScVrzyfr" %}
[Classes and structs](/configuration/binding/classes-and-structs.md)
{% endcontent-ref %}


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