Master Web Security with the OWASP API Security Top 10 2021/2023/2025 with Java Examples

Looking for a comprehensive and free OWASP API security course to upgrade your backend development skills? The OWASP API Security Top 10 2021/2023/2025 with Java Examples, taught by industry expert Andrii Piatakha, is a premier choice for those wanting to learn API security online. This Udemy course, updated August 2026, provides a deep dive into identifying and mitigating the most critical web vulnerabilities using practical Java implementations. By combining theoretical security standards with hands-on coding, students can earn a certification that validates their ability to build resilient, secure web applications in a modern threat landscape.

What You'll Learn

• Master the OWASP Top 10 guidelines for both 2017 and 2021 to identify critical web vulnerabilities.
• Implement secure coding practices specifically using Java examples to prevent common exploits.
• Analyze real-life examples of API vulnerabilities and apply effective prevention techniques.
• Build efficient internal team processes to ensure a Secure Design is integrated into the development lifecycle.
• Create detailed threat models to proactively identify security gaps before they are exploited.
• Apply the OWASP API Security Guidelines to harden RESTful services and web endpoints.
• Understand the most common security threats facing modern Web Applications and how to mitigate them.
• Develop the ability to produce production-ready secure code that meets global security standards.

Course Details

• Instructor: Andrii Piatakha
• Rating: 4.5 stars
• Enrolled students: 1,249,262
• Level: Intermediate
• Language: English
• Last updated: August 2026
• Certificate: Yes, upon completion
• Includes: Lifetime access, mobile-friendly content, and open-source code examples

What This Course Covers

OWASP Frameworks and Standards

• Detailed analysis of the OWASP Top 10 2017 and 2021 lists
• Comparison between different versions of security guidelines to understand evolving threats
• Application of OWASP API Security Guidelines to modern architectural patterns
• Understanding the impact of various vulnerability categories on business logic
• Review of global security standards for web application development

Secure Coding with Java

• Practical implementation of secure coding patterns using the Java language
• Techniques for preventing injection attacks through proper input validation
• Implementing secure output encoding to stop Cross-Site Scripting (XSS)
• Managing session security and authentication tokens within a Java environment
• Utilizing secure Java libraries and frameworks to reduce the attack surface
• Step-by-step coding exercises to transform vulnerable code into secure code

API Vulnerability Management

• Identifying and fixing Broken Object Level Authorization (BOLA) issues
• Mitigating Broken User Authentication and session management flaws
• Preventing Excessive Data Exposure through refined API responses
• Addressing Lack of Resources & Rate Limiting to prevent Denial of Service (DoS)
• Understanding and preventing Mass Assignment vulnerabilities in API endpoints
• Real-world case studies of API breaches and the specific fixes applied

Threat Modeling and Secure Design

• Fundamental concepts of threat modeling for web services
• How to identify trust boundaries and data flow vulnerabilities
• Integrating security checkpoints into the Software Development Life Cycle (SDLC)
• Building a culture of security within development and QA teams
• Creating a Secure Design document that guides the implementation phase
• Using threat models to prioritize security fixes based on risk levels

Practical Application and Tooling

• Using open-source code examples to simulate security vulnerabilities locally
• Working with testing frameworks to validate security patches in Java
• Practical tips and tricks for debugging security-related issues in production
• Leveraging the provided mobile application for interview preparation and knowledge testing
• Strategies for performing security audits on existing Java codebases

Who Should Take This Course

• Web Developers who want to move beyond basic functionality and implement professional-grade security.
• Software Architects responsible for designing the security infrastructure of enterprise-level applications.
• Software Engineers specializing in Java who need to master secure coding practices.
• Quality Assurance (QA) Engineers looking to incorporate security testing and vulnerability scanning into their workflows.
• Project & Delivery Managers who need to understand security risks to better manage development timelines and quality standards.

Prerequisites

• Basic Java Knowledge: You should be comfortable with Java syntax and basic object-oriented programming concepts.
• Web Basics: A fundamental understanding of how HTTP requests and responses work is recommended.
• API Familiarity: Knowledge of what a REST API is and how it functions will help you progress faster.
• No prior cybersecurity experience is required; this course is designed to take you from a developer's perspective to a security-conscious one.

Why Enroll in This Course

This course stands out because it bridges the gap between theoretical security checklists and actual implementation. While many tutorials explain what a vulnerability is, this training shows you exactly how to fix it in Java code. With a limited-time free coupon, you can access this high-value content 100% off, making it an unbeatable opportunity to learn from a top-rated IT consultant. Given the current sensitivity of data privacy and the rise in API-based attacks, gaining these skills now is critical for any serious developer. The inclusion of open-source code and tutor support ensures you aren't just watching videos but are actively solving security problems.

Course Highlights

• Practical Java Implementation: Unlike generic security courses, this focuses on real Java code, making it immediately applicable to your job.
• Open Source Access: Students receive the full source code for all examples and home tasks to run locally and experiment.
• Expert Instruction: Taught by a consultant endorsed by thousands of professionals from top global companies.
• Interactive Q&A Support: Direct access to the instructor for clarifying complex security concepts or fixing broken code.
• Interview Readiness: Includes a free mobile app with hundreds of tests to help you pass technical security interviews.
• High-Efficiency Content: Lessons are tightly edited to remove fluff, ensuring maximum knowledge transfer in minimum time.

Frequently Asked Questions

Q: Is this course really free? A: Yes, this course is available for free when you use a valid limited-time coupon. Once you enroll using the coupon, you get full access to all the materials, including the certificate of completion, at no cost.

Q: What will I learn in this OWASP API security course? A: You will learn how to identify the top 10 most critical API security risks according to OWASP. The course teaches you how to find these vulnerabilities in Java applications and provides the exact coding patterns needed to prevent them.

Q: Do I get a certificate after completing this course? A: Yes, upon successful completion of all the course modules and requirements, you will receive a certificate. This can be added to your LinkedIn profile to showcase your expertise in secure coding and API security.

Q: Is this course suitable for beginners? A: While the course is beginner-friendly regarding security, you should have a basic grasp of Java programming. It is designed specifically for developers who want to learn how to make their code secure, rather than for people who have never coded before.

Q: How long do I have to enroll for free? A: Free coupons for Udemy courses are typically available for a very limited time or for a specific number of redemptions. It is highly recommended to enroll as soon as possible to secure your lifetime access before the offer expires.

Final Thoughts

The OWASP API Security Top 10 2021/2023/2025 with Java Examples is an essential resource for any developer looking to harden their applications against modern threats. By combining the industry-standard OWASP framework with practical Java examples, Andrii Piatakha provides a roadmap for building truly secure software. Whether you are a developer, architect, or QA engineer, this course will give you the confidence to defend your APIs against the most common attacks. Start your journey toward becoming a security-conscious developer today.