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Microservice APIs: Using Python, Flask, FastAPI, OpenAPI and more
Strategies, best practices, and patterns that will help you design resilient microservices architecture and streamline your API integrations.
In Microservice APIs, you’ll
Service decomposition strategies for microservices
Documentation-driven development for APIs
Best practices for designing REST and GraphQL APIs
Documenting REST APIs with the OpenAPI specification (formerly Swagger)
Documenting GraphQL APIs using the Schema Definition Language
Building microservices APIs with Flask, FastAPI, Ariadne, and other frameworks
Service implementation patterns for loosely coupled services
Property-based testing to validate your APIs, and using automated API testing frameworks like schemathesis and Dredd
Adding authentication and authorization to your microservice APIs using OAuth and OpenID Connect (OIDC)
Deploying and operating microservices in AWS with Docker and Kubernetes
Microservice APIs teaches you practical techniques for designing robust microservices with APIs that are easy to understand, consume, and maintain. You’ll benefit from author José Haro Peralta’s years of experience experimenting with microservices architecture, dodging pitfalls and learning from mistakes he’s made. Inside you’ll find strategies for delivering successful API integrations, implementing services with clear boundaries, managing cloud deployments, and handling microservices security. Written in a framework-agnostic manner, its universal principles can easily be applied to your favorite stack and toolset.
About the technology
Clean, clear APIs are essential to the success of microservice applications. Well-designed APIs enable reliable integrations between services and help simplify maintenance, scaling, and redesigns. Th is book teaches you the patterns, protocols, and strategies you need to design, build, and deploy effective REST and GraphQL microservices APIs.
About the book
Microservice APIs gathers proven techniques for creating and building easy-to-consume APIs for microservices applications. Rich with proven advice and Python-based examples, this practical book focuses on implementation over philosophy. You’ll learn how to build robust microservice APIs, test and protect them, and deploy them to the cloud following principles and patterns that work in any language.
What's inside
Service decomposition strategies for microservices
Best practices for designing and building REST and GraphQL APIs
Service implementation patterns for loosely coupled components
API authorization with OAuth and OIDC
Deployments with AWS and Kubernetes
About the reader
For developers familiar with the basics of web development. Examples are in Python.
About the author
José Haro Peralta is a consultant, author, and instructor. He’s also the founder of microapis.io.
Table of Contents
PART 1 INTRODUCING MICROSERVICE APIS
1 What are microservice APIs?
2 A basic API implementation
3 Designing microservices
PART 2 DESIGNING AND BUILDING REST APIS
4 Principles of REST API design
5 Documenting REST APIs with OpenAPI
6 Building REST APIs with Python
7 Service implementation patterns for microservices
PART 3 DESIGNING AND BUILDING GRAPHQL APIS
8 Designing GraphQL APIs
9 Consuming GraphQL APIs
10 Building GraphQL APIs
In Microservice APIs, you’ll
Service decomposition strategies for microservices
Documentation-driven development for APIs
Best practices for designing REST and GraphQL APIs
Documenting REST APIs with the OpenAPI specification (formerly Swagger)
Documenting GraphQL APIs using the Schema Definition Language
Building microservices APIs with Flask, FastAPI, Ariadne, and other frameworks
Service implementation patterns for loosely coupled services
Property-based testing to validate your APIs, and using automated API testing frameworks like schemathesis and Dredd
Adding authentication and authorization to your microservice APIs using OAuth and OpenID Connect (OIDC)
Deploying and operating microservices in AWS with Docker and Kubernetes
Microservice APIs teaches you practical techniques for designing robust microservices with APIs that are easy to understand, consume, and maintain. You’ll benefit from author José Haro Peralta’s years of experience experimenting with microservices architecture, dodging pitfalls and learning from mistakes he’s made. Inside you’ll find strategies for delivering successful API integrations, implementing services with clear boundaries, managing cloud deployments, and handling microservices security. Written in a framework-agnostic manner, its universal principles can easily be applied to your favorite stack and toolset.
About the technology
Clean, clear APIs are essential to the success of microservice applications. Well-designed APIs enable reliable integrations between services and help simplify maintenance, scaling, and redesigns. Th is book teaches you the patterns, protocols, and strategies you need to design, build, and deploy effective REST and GraphQL microservices APIs.
About the book
Microservice APIs gathers proven techniques for creating and building easy-to-consume APIs for microservices applications. Rich with proven advice and Python-based examples, this practical book focuses on implementation over philosophy. You’ll learn how to build robust microservice APIs, test and protect them, and deploy them to the cloud following principles and patterns that work in any language.
What's inside
Service decomposition strategies for microservices
Best practices for designing and building REST and GraphQL APIs
Service implementation patterns for loosely coupled components
API authorization with OAuth and OIDC
Deployments with AWS and Kubernetes
About the reader
For developers familiar with the basics of web development. Examples are in Python.
About the author
José Haro Peralta is a consultant, author, and instructor. He’s also the founder of microapis.io.
Table of Contents
PART 1 INTRODUCING MICROSERVICE APIS
1 What are microservice APIs?
2 A basic API implementation
3 Designing microservices
PART 2 DESIGNING AND BUILDING REST APIS
4 Principles of REST API design
5 Documenting REST APIs with OpenAPI
6 Building REST APIs with Python
7 Service implementation patterns for microservices
PART 3 DESIGNING AND BUILDING GRAPHQL APIS
8 Designing GraphQL APIs
9 Consuming GraphQL APIs
10 Building GraphQL APIs
816 pages, Kindle Edition
Published March 7, 2023
Ratings & Reviews
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Displaying 1 - 9 of 9 reviews
September 5, 2022
I wished I had this book when I started my career. I've been working with microservices and APIs for 3 years and I've found a lot of valuable content in this book. It helped me understand how to read and write an OpenAPI specification, how to design a microservices platform, and how to add proper authorization to my APIs. Gosh it even helped me spot API security flaws at my company! I also learned a bunch of cool libraries to build APIs in Python. It's really well written with an easy-to-follow style.
The book is also packed with two full chapters that explain how to deploy microservices using Kubernetes - that's among the best and most valuable Kubernetes content I've read.
The code examples in GitHub are amazing and really useful.
I only wished the author also covered API monitoring and visibility issues, and how to design microservice APIs for scale and reliability, but I guess you can only pack so much into a single book.
The book is also packed with two full chapters that explain how to deploy microservices using Kubernetes - that's among the best and most valuable Kubernetes content I've read.
The code examples in GitHub are amazing and really useful.
I only wished the author also covered API monitoring and visibility issues, and how to design microservice APIs for scale and reliability, but I guess you can only pack so much into a single book.
October 28, 2023
I kept grabbing back for this book, so I decided to read it again.
October 15, 2022
Very helpful
October 16, 2022
체계적으로 잘 정리되어 있어서 실무에 많이 도움이 됩니다.
이 분야에 종사하시는 분들께 추천드립니다.
이 분야에 종사하시는 분들께 추천드립니다.
October 16, 2022
My company recently started migrating our platform to microservices and this book has been useful in every step of the process.
October 2, 2026
Microservice APIs is one of the most practical and well-organized books I've read on API design and microservices. José Haro Peralta manages to take what can often be a complex and overwhelming subject and present it in a clear, structured, and highly approachable way.
What I appreciated most is that the book goes beyond simply explaining how to build APIs. It focuses on why certain architectural decisions matter, covering design principles, service boundaries, maintainability, security, testing, and deployment in a way that feels grounded in real-world experience. The advice throughout the book reflects lessons learned from building production systems rather than just theoretical examples.
The Python examples using Flask and FastAPI are excellent and easy to follow, but what makes this book especially valuable is that the underlying concepts are framework-agnostic. Even developers working with other languages or frameworks can apply the design patterns and best practices presented here.
The sections on REST API design and OpenAPI documentation were particularly useful. The explanations are clear, and the examples demonstrate not only how to implement features but also how to create APIs that are intuitive, scalable, and easy for other developers to consume. I also enjoyed the GraphQL chapters, which provided a solid introduction while explaining when and where GraphQL fits into a microservices architecture.
Another standout aspect of the book is its comprehensive coverage of the software development lifecycle. Instead of stopping after implementation, the author walks readers through authentication, authorization, testing, validation, containerization with Docker, and deployment using Kubernetes. Having these topics brought together in a single resource makes the book incredibly valuable for anyone building production-ready services.
The writing is concise, engaging, and refreshingly practical. Every chapter builds naturally on the previous one, making it easy to progress from fundamental concepts to more advanced implementation strategies without feeling overwhelmed.
Whether you're transitioning into microservices, improving an existing architecture, or looking to strengthen your API design skills, this book provides an excellent balance of theory and hands-on guidance. I came away with several practical ideas that I can immediately apply to real projects.
Overall, Microservice APIs is an outstanding resource for software developers and architects alike. José Haro Peralta has created a thoughtful, comprehensive guide that deserves a place on every backend developer's bookshelf. Highly recommended for anyone serious about building reliable, maintainable, and scalable APIs.
What I appreciated most is that the book goes beyond simply explaining how to build APIs. It focuses on why certain architectural decisions matter, covering design principles, service boundaries, maintainability, security, testing, and deployment in a way that feels grounded in real-world experience. The advice throughout the book reflects lessons learned from building production systems rather than just theoretical examples.
The Python examples using Flask and FastAPI are excellent and easy to follow, but what makes this book especially valuable is that the underlying concepts are framework-agnostic. Even developers working with other languages or frameworks can apply the design patterns and best practices presented here.
The sections on REST API design and OpenAPI documentation were particularly useful. The explanations are clear, and the examples demonstrate not only how to implement features but also how to create APIs that are intuitive, scalable, and easy for other developers to consume. I also enjoyed the GraphQL chapters, which provided a solid introduction while explaining when and where GraphQL fits into a microservices architecture.
Another standout aspect of the book is its comprehensive coverage of the software development lifecycle. Instead of stopping after implementation, the author walks readers through authentication, authorization, testing, validation, containerization with Docker, and deployment using Kubernetes. Having these topics brought together in a single resource makes the book incredibly valuable for anyone building production-ready services.
The writing is concise, engaging, and refreshingly practical. Every chapter builds naturally on the previous one, making it easy to progress from fundamental concepts to more advanced implementation strategies without feeling overwhelmed.
Whether you're transitioning into microservices, improving an existing architecture, or looking to strengthen your API design skills, this book provides an excellent balance of theory and hands-on guidance. I came away with several practical ideas that I can immediately apply to real projects.
Overall, Microservice APIs is an outstanding resource for software developers and architects alike. José Haro Peralta has created a thoughtful, comprehensive guide that deserves a place on every backend developer's bookshelf. Highly recommended for anyone serious about building reliable, maintainable, and scalable APIs.
May 13, 2024
Solid book. Lots of practical discussions around architecture, testing, and deployment. I really liked that property-based testing was also included, which I thought was only possible in a functional language.
Two things I would have liked is some sort of discussion around auto dependency injection/resolution because manually doing dependency injection is tedious at times. The other is the deployment in EKS should have included multi-service deployment so that we could see services talking to each other.
But overall it covered a lot of ground, and resources pointed out to read on specific topics like architectural patterns, container networking etc. and if you are willing to spend some time you will find this book worth your time.
Two things I would have liked is some sort of discussion around auto dependency injection/resolution because manually doing dependency injection is tedious at times. The other is the deployment in EKS should have included multi-service deployment so that we could see services talking to each other.
But overall it covered a lot of ground, and resources pointed out to read on specific topics like architectural patterns, container networking etc. and if you are willing to spend some time you will find this book worth your time.
August 16, 2025
I'm not sure who this book is for. The book title is about an advanced topic, microservices, which is not something a beginner needs to undertake. But the book's content is for someone developing their first web app. It also doesn't touch on any of the real challenges of using microservices like data consistency, or asynchronous communication.
I was also disappointed by the amount of material on FastAPI as well. The author doesn't go into much detail on implementing anything beyond the simplest API endpoint, (e.g, no async requests, caching, background tasks) and even uses Flask for one of the services.
I was also disappointed by the amount of material on FastAPI as well. The author doesn't go into much detail on implementing anything beyond the simplest API endpoint, (e.g, no async requests, caching, background tasks) and even uses Flask for one of the services.
February 25, 2025
В целом, вполне достойное пособие по основам микросервисов. Вначале дается общая теория. А затем автор показывает разные подходы к построению api. Не всё пригодится на практике, но прочитать и ознакомиться было вполне познавательно. Глава про кубернетис оказалась весьма скомканной, так как невозможно в столь узкий объем впихнуть массу новой информации, не потеряв при этом четкость и понятность изложения.
Displaying 1 - 9 of 9 reviews