# Generate the Ruby SDK of an API in API Gateway
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The following procedure shows how to generate the Ruby SDK of an API in API Gateway.

**To generate the Ruby SDK of an API in API Gateway**

1. Sign in to the API Gateway console at [https://console.aws.amazon.com/apigateway](https://console.aws.amazon.com/apigateway).

1. Choose a REST API.

1. Choose **Stages**. 

1. In the **Stages** pane, select the name of the stage.

1. Open the **Stage actions** menu, and then choose **Generate SDK**.

1. For **Platform**, choose the **Ruby** platform and do the following: 

   1.  For **Service Name**, specify the name of your SDK. For example, **SimpleCalc**. This is used to generate the Ruby Gem namespace of your API. The name must be all letters, (`a-zA-Z`), without any other special characters or numbers.

   1.  For **Ruby Gem Name**, specify the name of the Ruby Gem to contain the generated SDK source code for your API. By default, it is the lower-cased service name plus the `-sdk` suffix—for example, **simplecalc-sdk**.

   1.  For **Ruby Gem Version**, specify a version number for the generated Ruby Gem. By default, it is set to `1.0.0`.

1. Choose **Generate SDK**, and then follow the on-screen directions to download the SDK generated by API Gateway.

Follow the instructions in [Use a Ruby SDK generated by API Gateway for a REST API](how-to-call-sdk-ruby.md) to use the generated SDK.

 Every time you update an API, you must redeploy the API and regenerate the SDK to have the updates included.