> For the complete documentation index, see [llms.txt](https://docs.takomo.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.takomo.io/parameter-resolvers/built-in-parameter-resolvers.md).

# Built-in parameter resolvers

You can use parameter resolvers to resolve values for stack parameters at deployment time. Takomo has a few built-in parameter resolvers, and you can also implement your own.

In a stack configuration, you choose which resolver to use by providing value to the `resolver` property. In addition to the resolver property, each resolver may have its own set of additional properties.

Here are the built-in parameter resolvers:

* [Stack output resolver](/parameter-resolvers/built-in-parameter-resolvers/stack-output-resolver.md)
* [External stack output resolver](/parameter-resolvers/built-in-parameter-resolvers/external-stack-output-resolver.md)
* [Command resolver](/parameter-resolvers/built-in-parameter-resolvers/command-resolver.md)
* [File contents resolver](/parameter-resolvers/built-in-parameter-resolvers/file-contents-resolver.md)
* [Hook output resolver](/parameter-resolvers/built-in-parameter-resolvers/hook-output-resolver.md)
* [SSM parameter resolver](/parameter-resolvers/built-in-parameter-resolvers/ssm-parameter-resolver.md)
* [Secret resolver](/parameter-resolvers/built-in-parameter-resolvers/secret-resolver.md)

## See also

* [Configuring parameter resolvers in stack configuration](/stack-properties/parameters.md#dynamic-parameters)
* [Implementing custom parameter resolvers](/parameter-resolvers/custom-parameter-resolvers.md)