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description=Use x-fern-parameter-name to customize query parameter, header and path parameter naming.;

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names, parameters, customize, parameter, headers, query, path, tag, display, property, documentation, api, definitions, resources, company,

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customize parameter names openapi fern documentation for ai agents a documentation index is available at the root level at llms txt append llms txt to any url for a page level index or md for the markdown version of any page search ask ai book a demo log in start for free overview what is an api definition project structure openapi overview overlays overrides authentication servers sync your specification endpoints extensions overview api version audiences availability base path default values enum descriptions names and availability request response examples api explorer control global headers ignoring elements sdk method names sdk variables tag display names parameter names property names idempotency pagination retry behavior schema names server names and url templating integrate your server framework generators yml reference asyncapi openrpc grpc fern definition what is an api definition project structure overview overlays overrides authentication servers sync your specification http json endpoints webhooks multipart form uploads server sent events overview api version audiences availability base path default values enum descriptions names and availability request response examples api explorer control global headers ignoring elements sdk method names sdk variables tag display names parameter names property names idempotency pagination retry behavior schema names server names and url templating fastapi generators yml reference overview overrides authentication servers sync your specification publish subscribe operations message formats message bindings overview audiences availability request response examples ignoring elements server names overview overrides authentication servers sync your specification json rpc methods overview audiences availability request response examples ignoring elements sdk method names sdk group names server names overview overrides authentication servers sync your specification grpc services streaming error handling generators yml reference overview authentication types overview http json endpoints multipart form uploads bytes server sent events webhooks websockets errors imports examples audiences availability overview environments global headers errors packages depending on other apis export to openapi book a demo log in start for free english light on this page headers query parameters path parameters scroll to top openapi extensions customize parameter names ask a question copy page view as markdown more actions the x fern parameter name extension allows you to customize the variable names of parameters in your generated sdks headers in the example below the header x api version is renamed to version in the generated sdk the rename makes the sdk more human readable 1 paths 2 user 3 get 4 operationid list_user 5 parameters 6 in header 7 name x api version 8 x fern parameter name version 9 schema 10 type string 11 required true query parameters in the example below the query parameter q is renamed to search_terms in the generated sdk the rename makes the parameter more approachable for end users 1 paths 2 user search 3 get 4 operationid search_user 5 parameters 6 in query 7 name q 8 x fern parameter name search_terms 9 schema 10 type string 11 required false path parameters in the example below the path parameter userid is renamed to id in the generated sdk the rename makes the sdk less verbose 1 paths 2 user userid 3 get 4 operationid get_user 5 parameters 6 in path 7 name userid 8 x fern parameter name id 9 schema 10 type string 11 required false was this page helpful yes no edit this page previous tag display names next property names checking status soc 2 soc 2 type ii 2026 fern birch solutions inc a postman company documentation sdks docs ask fern cli reference api definitions openapi asyncapi openrpc grpc resources blog support pricing company brand kit privacy policy terms of service api definitions api definitions import and configure your api specifications english api definitions api definitions import and configure your api specifications