Top 100+ Spring Boot REST API Interview Questions and Answers for Freshers & Experienced (2026) | Java Backend REST API Interview Preparation

Prepare for your next backend interview with Spring Boot REST API Interview Questions and Answers on SkillToGrowth. REST APIs are a core component of modern web and mobile applications, making Spring Boot REST API knowledge essential for Java backend developers. This section is designed to help freshers and experienced professionals master RESTful web services, API design principles, HTTP methods, status codes, request and response handling, validation, exception handling, authentication, security, and performance optimization through practical examples and real interview questions.

Our interview preparation guide covers beginner to advanced topics, including REST Architecture, CRUD APIs, Request Mapping, Path Variables, Query Parameters, Request Body Validation, ResponseEntity, Global Exception Handling, DTOs, Pagination, Sorting, Filtering, File Upload APIs, API Versioning, JWT Authentication, OAuth2, Spring Security, OpenAPI (Swagger), CORS, Testing with Postman, Unit & Integration Testing, and REST API best practices. Every question is accompanied by detailed explanations, Java code examples, real-world scenarios, and expert tips to help you understand not only the concepts but also how to apply them in production environments. Whether you're preparing for product-based companies, service-based organizations, or enterprise backend roles, SkillToGrowth provides everything you need to confidently crack Spring Boot REST API interviews and build scalable, secure, and high-performance RESTful applications.