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# Extensions

## Docs

- [Extensions overview](https://buildwithfern.com/learn/api-definitions/openrpc/extensions/overview.md): OpenRPC extensions guide for Fern. Use x-fern-ignore, x-fern-examples, x-fern-availability, and more to improve SDK generation.
- [Use audiences to filter your API](https://buildwithfern.com/learn/api-definitions/openrpc/extensions/audiences.md): Use `x-fern-audiences` to filter to relevant methods, parameters and schemas
- [Availability](https://buildwithfern.com/learn/api-definitions/openrpc/extensions/availability.md): Mark features as available in specific SDK versions using `x-fern-availability` extension
- [Request + response examples](https://buildwithfern.com/learn/api-definitions/openrpc/extensions/request-response-examples.md): Add multiple request and response examples to OpenRPC methods with x-fern-examples. Improve your SDK docs with real-world use cases.
- [Ignoring methods or schemas](https://buildwithfern.com/learn/api-definitions/openrpc/extensions/ignoring-elements.md): Skip reading specific OpenRPC elements using `x-fern-ignore` extension
- [SDK Method Names](https://buildwithfern.com/learn/api-definitions/openrpc/extensions/method-names.md): Control SDK method names in OpenRPC specifications. Use `x-fern-sdk-method-name` to define intuitive, language-specific method names for your JSON-RPC API.
- [SDK group names](https://buildwithfern.com/learn/api-definitions/openrpc/extensions/sdk-group-names.md): Learn how to use x-fern-sdk-group-name in OpenRPC to organize related methods into logical groups for cleaner, more intuitive SDK code.
- [Server names](https://buildwithfern.com/learn/api-definitions/openrpc/extensions/server-names.md): Specify custom names for servers using `x-fern-server-name` extension