I have just pushed an initial release of aws-arn[1] to Hackage. This library provides a type representing Amazon Resource Names (ARNs)[2], and parsing/unparsing functions for them. The provided optics make it very convenient to rewrite parts of ARNs. An example, from the documentation: API Gateway Lambda Authorizers are given the ARN of the requested endpoint and method, and are expected to respond with an IAM Policy Document. It is sometimes useful to manipulate the given ARN when describing which resources to authorize: -- Returns "arn:aws:execute-api:us-east-1:123456789012:my-spiffy-api/stage/*" let authorizerSampleARN = "arn:aws:execute-api:us-east-1:123456789012:my-spiffy-api/stage/GET/some/deep/path" in over (_ARN . arnResource . slashes) (\parts -> take 2 parts ++ ["*"]) authorizerSampleARN The code is available on GitHub[3]; bug reports and pull requests are welcome. There is some additional support for parsing specific resource types -- PRs to support more resource types are especially welcome. Best, -- Jack [1]: https://hackage.haskell.org/package/aws-arn-0.1.0.0 [2]: https://docs.aws.amazon.com/general/latest/gr/aws-arns-and-namespaces.html [3]: https://github.com/bellroy/aws-arn