Top Swagger Interview Questions (2024)

1. What is swagger used for?

2. What are advantages to using swagger?

3. What is difference between swagger and postman?

4. Is swagger only for REST API?

5. How does swagger 3 integrate with Spring boot?

6. What is OpenAPI?

7. What is the difference between Swagger and OpenAPI?

8. How to integrate Spring Boot with Swagger 2?

9. How to implement security in Swagger using authentication login?

Q: What is swagger used for?
Ans:

Swagger is an Interface Description Language that is used to represent RESTful APIs expressed in JSON. Swagger, in conjunction with a collection of open-source software tools, is used to design, construct, describe, and consume RESTful online services.

Q: What are advantages to using swagger?
Ans:

1. It is an open source and has full community around it.
2. Swagger integrates the API documentation with the server and client.
3. Swagger offers many tools like Swagger Hub, Swagger Editor, Swagger UI, Swagger Codegen.
4. Provides responses in JSON and XML formats.
5. It enables us to create REST API documentation and interact with the REST API.

Q: What is difference between swagger and postman?
Ans:

Swagger is a specification for APIs, whereas Postman is an API client.

Swagger tools are useful for API first development, whereas Postman is useful for testing such API based on specifications.

Q: Is swagger only for REST API?
Ans:

The OpenAPI Specification (previously Swagger Specification) is a REST API description format. We can describe our complete API in an OpenAPI file, which includes: Endpoints that are available (/employee) and the actions that may be performed on each endpoint (GET /employees, POST /employee)

Q: How does swagger 3 integrate with Spring boot?
Ans:

Refer Spring Boot Swagger 3 Example to understand it's implementation.

Q: What is OpenAPI?
Ans:

The OpenAPI Specification (previously known as the Swagger Specification) is a machine-readable interface file specification for describing, generating, consuming, and visualising RESTful web services.

OpenAPI 3.0 is the latest version of the OpenAPI Specification, an open-source format for describing and documenting APIs.

Q: What is the difference between Swagger and OpenAPI?
Ans:

In short:

1. OpenAPI = Specification
2. Swagger = Tools for implementing the specification
3. From version 3, Swagger tools were renamed to OpenAPI.

Q: How to integrate Spring Boot with Swagger 2?
Ans:

Refer Spring Boot Swagger 2 Example to understand it's implementation.

Q: How to implement security in Swagger using authentication login?
Ans:

Refer Spring Boot Swagger 3 Security Example to understand it's implementation.