Looking for a clear, current guide to API Security? API Security is a 53-page illustrated PDF from the oJAYo team. Protecting the interfaces that connect apps, partners and AI agents.
APIs, application programming interfaces, are how software talks to software. Mobile apps call APIs to show your bank balance, websites call them to load your basket, partners call them to exchange orders, and AI agents call them to take actions on your behalf. Most internet traffic now involves APIs.
That makes APIs a prime target. They expose data and business functions directly, often with less scrutiny than web pages, and attackers have learned that a single missing authorization check can expose millions of records.
Why buy API Security?
- Created by the oJAYo team of security experts: written by practitioners, then technically reviewed and edited.
- Turns a big security topic into clear, practical steps you can use at work right away.
- 35 short, focused chapters you can read in one sitting each, so steady progress fits around a busy week.
- Plain-language explanations with diagrams, so you understand the why as well as the how.
- Up to date for 2026, covering today’s threats, tools and frameworks.
- Defensive and practical: checklists and real-world examples instead of jargon.
- Ready-to-use checklists you can take straight into your next project or review.
- Instant PDF download that works on any laptop, tablet or phone, yours to keep.
What you will learn
- What APIs are
- API styles
- Why attackers target APIs
- Lessons from API breaches
- The OWASP API Security Top 10
- Secure API design
- Secrets in mobile and browser apps
- API1: Broken Object Level Authorization
- API2: Broken Authentication
- API3: Broken Object Property Level Authorization
- API4: Unrestricted Resource Consumption
- API5: Broken Function Level Authorization
- API6: Unrestricted Access to Sensitive Business Flows
- API7: Server Side Request Forgery
Who this book is for
- Developers building or consuming APIs.
- Architects and platform teams.
- Testers and security beginners.
What is inside
- Format: PDF, instant download
- Length: 53 pages
- Chapters: 35
- Diagrams and screens: 15
- Created by: the oJAYo expert team (written, technically reviewed and edited)
- Publisher: oJAYo.com
- Published: 2026
- Series number: No. 115
Frequently asked questions
What does API Security cover?
Topics include “API styles”, “Why attackers target APIs”, “Lessons from API breaches”, “The OWASP API Security Top 10” and “Secure API design”, across 35 chapters with 15 diagrams and illustrated screens.
Who should read API Security?
Developers building or consuming APIs. Architects and platform teams. Testers and security beginners.
Is it suitable for beginners?
Yes. It starts from the basics and builds up step by step, with a glossary for any term that is new to you.
What format is the book, and how do I get it?
It is a 53-page PDF. After checkout you get an instant download link, and you can read it on any device.
Is the content up to date?
Yes. It was written, reviewed and published in 2026 by the oJAYo team at oJAYo.com and reflects current versions, tools and practices.
OWASP is a registered trademark of the OWASP Foundation. Other product names are trademarks of their respective owners.
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