How to Configure Swagger UI in Spring Boot 3.x

Discover how to easily configure Swagger UI in your Spring Boot application using springdoc-openapi, a simple alternative to SpringFox for seamless integration.
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Configuring Swagger UI in Spring Boot 3.x

If you're developing a RESTful API using Spring Boot, having a clear and interactive API documentation is essential. One of the most popular tools for this purpose is Swagger UI. However, some developers encounter issues when trying to access the Swagger interface, such as receiving a 500 error. In this post, we’ll guide you on how to properly configure Swagger UI in your Spring Boot application, especially if you are using version 3.x of Spring Boot.

Understanding the Problem

Solution Overview

To address the issue with accessing Swagger UI using Spring Boot 3.x, you will need to switch from SpringFox to springdoc-openapi. This will involve:

Removing SpringFox configurations and dependencies.

Adding the springdoc-openapi dependency to your project.

Accessing the Swagger UI again via your browser.

Step-by-Step Instructions

1. Remove SpringFox Configurations

2. Add springdoc-openapi Dependency

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Make sure this new dependency is saved, and your Maven project is updated accordingly.

3. Access Swagger UI

After completing the above changes, you can start your Spring Boot application once again. To access the Swagger UI, open your web browser and type in the following URL:

[[See Video to Reveal this Text or Code Snippet]]

If everything is correctly configured, you should now see your API documentation rendered beautifully in the Swagger UI.

Conclusion

Configuring Swagger UI in Spring Boot can be tricky, especially when transitioning to newer versions like Spring Boot 3.x. By switching from SpringFox to springdoc-openapi, you can resolve issues like the 500 error and ensure your API is well-documented and accessible. Following these simple steps will help you set up Swagger UI effectively, allowing both you and your users to interact with your API seamlessly.

Remember to test your endpoints after configuration and make sure Swagger UI displays your API methods as expected. Happy coding!