Fern DefinitionIntegrations

Export from Fern Definition to OpenAPI

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Fern Definition isn’t recommended for new customers and Fern isn’t accepting feature requests for this format. It remains supported for existing users.

To prevent lock-in to the Fern Definition format, you can export your API definition to OpenAPI 3.1 at any time using the fern export command.

If you have multiple APIs defined in your fern/apis/ folder, use --api to specify which API to export.

terminal
$fern export path/to/openapi.yml
$fern export path/to/openapi.json
$
$# Specify API to export
$fern export --api public-api path/to/openapi.yml