Fern

Fern reads OpenAPI/Swagger specs and generates idiomatic client SDKs and server stubs from them.

→ Client and server code generated from the API contract — spec drift between code and docs becomes structurally impossible.

Fern reads OpenAPI specs managed and validated by Redocly, generating SDKs from a well-structured spec.

→ Clean SDK generation starting from a Redocly-validated spec — spec quality directly improves generated SDK quality.

Fern reads OpenAPI specs from Stoplight, generating SDKs from specs that have been visually authored and validated.

→ Visual API design in Stoplight feeds directly into Fern's SDK generation pipeline — design once, generate everywhere.

Fern generates API reference docs and sends them to Mintlify for rendering as a polished public documentation site.

→ Beautiful API docs generated directly from Fern's SDK generation pipeline — code and docs generate together from the same spec.