MCQs on Defining API Specifications | Swagger Multiple Choice Questions | Swagger MCQ questions and answers

Swagger is a widely-used tool for designing, building, and documenting APIs. These Swagger MCQ questions and answers cover topics like defining API specifications, understanding the OpenAPI structure, writing endpoints and methods, and handling parameters, responses, and request bodies. Test your knowledge to master API design and documentation with Swagger.

Defining API Specifications

Structure of OpenAPI Specification (Paths, Definitions, and Components)

1. What does the “paths” section in OpenAPI specify?
   a) Authentication methods
   b) HTTP methods and endpoints
   c) Error codes and their descriptions
   d) Database schemas
2. Which part of the OpenAPI specification defines reusable objects?
   a) Paths
   b) Components
   c) Definitions
   d) Tags
3. What is the purpose of the “definitions” section in Swagger?
   a) To define endpoint paths
   b) To store reusable schemas and objects
   c) To specify HTTP status codes
   d) To document API versions
4. What format is used for writing OpenAPI specifications?
   a) JSON or YAML
   b) XML
   c) Plain text
   d) Markdown
5. In OpenAPI, where would you define reusable parameters or responses?
   a) Paths
   b) Components
   c) Info section
   d) Servers

Writing API Endpoints and Methods

6. What HTTP method is used for retrieving data from an API?
   a) POST
   b) GET
   c) PUT
   d) DELETE
7. Which HTTP method is typically used to create a resource?
   a) GET
   b) POST
   c) PATCH
   d) OPTIONS
8. In Swagger, how do you specify an operation for a particular endpoint?
   a) Add the HTTP method under the endpoint in the paths section
   b) Use the “info” section
   c) Define it in the components section
   d) Add it under the “servers” section
9. How do you document multiple operations for the same endpoint in OpenAPI?
   a) Use a different paths section for each operation
   b) Use separate HTTP methods under the same endpoint
   c) Write them in the servers section
   d) It is not possible
10. What is a common practice for naming API endpoints?
    a) Use action-based verbs and plural nouns (e.g., /getUsers)
    b) Use resources and plural nouns (e.g., /users)
    c) Use single-word paths (e.g., /list)
    d) Use random alphanumeric strings

Parameters, Responses, and Request Bodies

11. What type of parameter is appended to the endpoint URL?
    a) Path parameter
    b) Query parameter
    c) Header parameter
    d) Request body parameter
12. How are path parameters represented in OpenAPI?
    a) With {} brackets
    b) Using [] brackets
    c) As a JSON object
    d) Using query strings
13. What section in Swagger defines expected API responses?
    a) Paths
    b) Responses
    c) Components
    d) Servers
14. How do you specify a required parameter in OpenAPI?
    a) By adding "required": true
    b) By placing it in the “components” section
    c) By marking it with an asterisk (*)
    d) By writing it in uppercase
15. What does a 201 HTTP status code indicate?
    a) Success but no content
    b) The resource was successfully created
    c) Client-side error
    d) Server-side error
16. Where do you document the schema of a request body in OpenAPI?
    a) Under the “responses” section
    b) Under the “requestBody” section
    c) In the “paths” definition
    d) In the “info” section
17. What is the purpose of the “description” field in a response?
    a) To specify the API version
    b) To explain the meaning or purpose of the response
    c) To list associated endpoints
    d) To provide authorization details
18. What type of response format is typically used in APIs?
    a) JSON
    b) CSV
    c) Plain text
    d) YAML
19. How do you specify multiple response types (e.g., JSON, XML) in OpenAPI?
    a) Use the “content” object in the responses section
    b) Add them to the “info” section
    c) Include them in the “servers” section
    d) Write them as comments
20. What does a 400 status code usually indicate in an API response?
    a) Successful request
    b) Bad request (client error)
    c) Resource not found
    d) Server error

Advanced Concepts in Swagger

21. What is a Swagger “tag” used for?
    a) Grouping related operations
    b) Defining reusable schemas
    c) Creating endpoints
    d) Specifying request methods
22. How do you define multiple servers for an API in Swagger?
    a) Using the “servers” section
    b) Listing them under the “components” section
    c) Adding them to the “responses” section
    d) Including them in the “info” section
23. Which HTTP header parameter is commonly used for authentication?
    a) Authorization
    b) Content-Type
    c) Accept
    d) User-Agent
24. What is an advantage of using reusable components in Swagger?
    a) Simplifies debugging
    b) Reduces redundancy in API specifications
    c) Speeds up API responses
    d) Increases schema complexity
25. How are nested JSON objects represented in Swagger schemas?
    a) As a string field
    b) Using $ref for component definitions
    c) As plain text descriptions
    d) They cannot be represented
26. What is the purpose of the “info” section in OpenAPI?
    a) To define authentication methods
    b) To provide metadata about the API
    c) To document request parameters
    d) To store reusable objects
27. What does the “servers” section define in OpenAPI?
    a) API endpoints
    b) Base URLs for the API
    c) Database connections
    d) Test cases
28. Which keyword is used to define data types in OpenAPI?
    a) format
    b) type
    c) schema
    d) example
29. What is the role of an API description in Swagger?
    a) To explain the entire API purpose and usage
    b) To group endpoints
    c) To specify authentication methods
    d) To log errors
30. What does the example field in OpenAPI do?
    a) Provides an example value for documentation and testing
    b) Validates the schema
    c) Overrides the parameter name
    d) Specifies the response time

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