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API / Swagger Interview questions

What is the difference between springfox and springdoc-openapi?

Both are Java libraries that generate an OpenAPI document automatically from annotated Spring controllers, but they target different specification versions and have very different current maintenance status.

springfoxspringdoc-openapi
Generates Swagger 2.0 documents by default.Generates OpenAPI 3.x documents.
Development has largely stalled; compatibility issues with newer Spring Boot.Actively maintained; keeps pace with current Spring Boot releases.
Uses io.swagger.annotations (Swagger 2 annotation package).Uses io.swagger.v3.oas.annotations (OpenAPI 3 annotation package).
Historically the default choice for older Spring Boot projects.Now the generally recommended choice for current Spring Boot projects.

Because springfox's maintenance has slowed considerably and it has known compatibility problems with recent Spring Boot versions, springdoc-openapi is the more commonly recommended choice for new projects today, and many existing projects have migrated to it specifically to unblock Spring Boot upgrades.

Which library generates OpenAPI 3.x documents?
Why do many projects migrate away from springfox?

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