book

RESTful API Design Patterns and Best Practices

Name: RESTful API Design Patterns and Best Practices
ISBN: 9781835885284

by Andrzej Jarzyna, Samir Amzani

October 2025

Intermediate to advanced

406 pages

9h 37m

English

Packt Publishing

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Preface
Who this book is forWhat this book coversTo get the most out of this bookGet in touchFree Benefits with Your BookHow to Unlock
The Apprentice’s Study – Preparing for the Craft
The “Why” of API Development
Free Benefits with Your BookThe “Why” of API development: Exploring the core motivationsThe essence of APIsAudience-centric API designTechnological drivers for building APIsAPIs: The Business Game ChangersThe balancing act: Creating new vs. extending existing APIsAdhering to standards in API developmentKnowing when to hold back: When not to build an APITackling API SprawlIdentifying your API’s audience: Tailoring your approachCommunication and affordance-centric API designBeyond designAPIs as business catalysts: Driving value and innovationHow APIs are creating innovationHow good API design impacts API EconomySummaryGet This Book’s PDF Version and Exclusive Extras
API as a Product: Designing APIs with a Product Mindset
Shifting paradigm – APIs as productsThe building blocks of API as a productCustomer centricityFocus on designReusabilityConsistencyAPI product ownerThe role of an API product ownerRisks of not having an API product ownerBuilding API product owner capabilityDXUnderstanding your audienceDesigning your developer journeyAPI monetization strategiesWhat’s API monetizationDesigning your monetization modelAPI bundlingWhat’s an API bundle?What’s an API plan?Example – Magic Cloud API packagingReal-world use case – Twilio’s SendGrid Email APIAPI portalSummaryGet This Book’s PDF Version and Exclusive Extras
Understanding Application and API Lifecycles
What is the API Lifecycle?Why knowing about your API lifecycle is important for a good API designWhat are the benefits of API lifecycle management?Defining the stages of the API lifecycleDesignDevelopment and testingDeploymentPublishingConsuming and monitoringUpdateRetirementWhy is the design stage the one that impacts everything?Successfully managing application and API LifecyclesExample of a life cycle model for an e-storeThe importance of communicationPrototyping and quick feedback loopSummaryGet This Book’s PDF Version and Exclusive Extras
Applying Domain-Driven Design to APIs
Domain-driven design overviewWhat is domain-driven design?Why is domain-driven design important?Bridging the communication gapEnabling microservices and organizational scalabilityReducing technical debtEnhancing maintainabilityBuilding blocks of domain-driven designDomainSubdomainBounded contextsUbiquitous languageEntitiesValue objectsAggregatesRepositoriesHow can domain-driven design benefit APIs?Enabling experience-based APIsAvoiding accidental complexityImproving API securityApplying domain-driven design to REST APIsAligning APIs with ubiquitous languageDefining bounded contexts for APIsDesigning experience-based APIsMaking your API discoverableSummaryGet This Book’s PDF Version and Exclusive Extras
The Wizard’s Grimoire – Mastering the Fundamentals of REST
Comparing and Choosing the Right API Style
What’s an API style?Importance of choosing the right API styleAPI style familiesFunction-based APIsResource-based APIsQuery-based APIsEvent-based APIsHow to choose the right API styleUnderstanding the core requirementsSynchronous versus asynchronous communicationData complexity and flexibilityCoupling: tight versus looseScalability and performanceBusiness and use case considerationsDeveloper experience and integrationMixing API stylesSummaryGet This Book’s PDF Version and Exclusive Extras
REST Design Constraints and Maturity Models
Technical requirementsThe HTTP protocolCharacteristics of the HTTP protocolThe structure of an HTTP request and responseURIHTTP methodsHTTP headersHTTP response codesHTTP/2 and beyondREST API design constraintsClient-serverStatelessCacheableUniform interfaceLayered systemCode on demand (optional)API maturityRMMLevel 0: The Swamp of POXLevel 1: ResourcesLevel 2: HTTP VerbsLevel 3: Hypermedia Controls (HATEOAS)WADMMLevel 0: Database-centricLevel 1: Object-centricLevel 2: Resource-centricLevel 3: Affordance-centricHow to assess and improve your API’s maturitySummaryGet This Book’s PDF Version and Exclusive Extras
Constructing an API Design Domain Model
Technical requirementsMagic Items Store exampleUnderstanding the role of API modeling in API designWhat is API modeling?API modeling componentsData structuresEndpointsOperationsRelationshipsAPI modeling and API designBeyond physical API modelingAPI profiles: Capturing broader contextLogical versus physical modelsExtending the model with business rulesAddressing multiple API stylesDiving into JSON Schema for API modelingWhat is JSON Schema?The importance of JSON Schema in REST APIsJSON Schema beyond REST: other API stylesBest practices for using JSON Schema in API modelingAdopting the minimal API surface principleThe problem of over-engineeringThe minimal API surface principleExamples of a minimal API surface versus an over-engineered APIExample 1: Minimal API surfaceExample 2: Over-engineered APIConstructing an API design domain model from a ubiquitous languageStep 1: Define the ubiquitous languageStep 2: Define the use casesStep 3: Map use cases to REST API verbsStep 4: Define the resource model using JSON SchemaStep 5: Define state transitions and input modelsStep 6: Compile everything into the OpenAPI SpecificationBringing it all togetherSummaryGet This Book’s PDF Version and Exclusive Extras

Designing and Managing Effective API Contracts
Technical requirementsUnderstanding the concept and importance of API contractsWhat is an API contract?The importance of API contractsEnsuring consistency and predictabilityFacilitating collaborationMitigating change and managing versionsEnhancing security and reliabilitySupporting API-first design and developmentIntroducing API contract building blocksTechnical specificationsEndpoints definitionData models and schemasSecurity frameworkBusiness commitmentsService-Level Agreements (SLAs)Operational policiesCompliance and legal requirementsManaging your API contractsThe challenge of API sprawlAddressing API sprawlSingle Source of API Truth (SSOT)Implementing a central API design repositoryManaging API contracts with GitHub: Magic Items Store use caseSummaryGet This Book’s PDF Version and Exclusive Extras
The Archmage’s Circle – Forging and Evolving API Contracts
Understanding the OpenAPI Specification
The origins and purpose of OpenAPIWhy use OAS?How to use OASDesigning REST APIs with OASIntroducing the Magic Items store APIThe structure of OASThe info object: your API’s first impressionThe paths object: mapping your API’s capabilities The parameters object: configuring your API’s inputsParameter types and locationsParameter object fieldsHandling objects and arrays in parametersThe requestBody object: structuring your API’s payloadsBasic structure and key fieldsMultiple content typesThe critical importance of examplesThe responses object: defining your API’s output contractsKey fields of the responses objectHTTP status codes in the responses mapThe importance of defining all possible responsesWhy to avoid the default responseClosing the communication loopThe security object: protecting your API resourcesUnderstanding security requirements and scopesSecurity schemesWhy OAuth 2.0 is preferred for most APIsSecuring your magical realmThe components object: your API’s reusable building blocksSummaryGet This Book’s PDF Version and Exclusive Extras
OpenAPI as a Contract: Best Practices and Implementation
OpenAPI as a contract for your APIOAS as your single source of truthHow OpenAPI implements the contract concept in practiceTranslating abstract API contracts into executable OAS documentsKey elements that make OAS effective as a binding agreementOAS-powered tools across your workflowDocumentation generators: bringing your API to lifeMock servers: development without waitingValidators: ensuring contract complianceCode generators: from definition to implementationGateway configurations: managing API trafficTesting frameworks: verifying contract complianceShifting left: catching API issues before they happenDetecting contract violations before deploymentTest everything against your contractBuilding validation gates in your pipelineTransforming teams with OAS adoptionMaking API design decisions clear and consistentGetting everyone speaking the same languageSpeeding up development with contract-first practicesBest practices for using OpenAPIDesigning clear and consistent API structuresOrganizing resources logicallyEstablishing consistent URL patternsDefining meaningful operationsEstablishing naming conventionsCreating consistent resource patternsPagination, filtering, and sortingLeveraging reusable componentsCreating component schemas for common data structuresOrganizing components for maintainabilityImplementing common API patternsImplementing robust error handling with problem detailsHandling paginationAvoiding bulk operationsThe importance of examplesDocumenting error codesImplementing long-running operations in REST APIsUsing 202 accepted for asynchronous processingUsing 303 See Other for completion redirectionCallbacks and webhooks for notificationsBest practices for long-running operationsAPI versioning approachesSummaryGet This Book’s PDF Version and Exclusive Extras
Using JSON Schema to Define Your Object Models
Technical requirementsUnderstanding JSON SchemaIntroduction to JSON SchemaBasic conceptsData typesBasic structure of a JSON schemaAdvanced conceptsCombining schemas (allOf, anyOf, oneOf, and not)Exploring conditional subschemasReferences and reusability ($ref)JSON Hyper-SchemaJSON Schema at workEvolutionHandling schema changesIntegration with development workflowsUsing JSON Schema in API developmentAutomating schema validation in CI/CD pipelinesBest practices for using JSON SchemaSchema design principlesDocumentation and communicationDocumenting schemas for developersUsing JSON Schema for API documentationPerformance considerationsOptimizing schema validationBalancing validation strictness and performanceSecurity implicationsPreventing security vulnerabilities with JSON SchemaSummaryGet This Book’s PDF Version and Exclusive Extras
Don’t Hate Your Hypermedia: Creating APIs for Humans and AIs
The power of hypermedia as a REST constraintBeyond basic REST: implementing true hypermediaHypermedia’s critical role in RESTAssessing your API’s hypermedia maturityFrom theory to practice: implementing hypermediaHypermedia controls in practiceImplementing link relations effectivelyState transitions as hypermedia controlsContext-sensitive actionsBalancing hypermedia richness with simplicityNavigating hypermedia implementation: patterns, formats, and challengesEssential hypermedia design patternsNavigating collections: pagination, filtering, and sortingRelated resource discovery patternsChoosing the right hypermedia formatWhy your format choice mattersOvercoming implementation challengesClient library considerationsIncremental adoption strategies and handling backward compatibilityDesigning hypermedia APIs for AI consumptionUnderstanding AI API consumption patternsHow AI systems interpret and navigate API structuresKey differences between human and AI consumptionAI capabilities: pattern recognition, context understanding, and reasoningCurrent limitations and expected evolution in AI API interactionsAI-navigable APIs: designing for machine consumptionConsistencyAI using OpenAPI documentsState machines and decision trees in API designModelling complex workflows as state machinesPractical examples and futureproofingSummaryGet This Book’s PDF Version and Exclusive Extras
API Change Management: Strategies for Versioning and Evolution
The why of API change managementAPI modernizationNew API capabilitiesSecurity updatesAPI change management building blocksStrategic prioritization and planningClear communication and developer engagementAPI change processVersioning strategyGlobal API versioningResource-based versioningEvolution-only approachHybrid model (combining versioning and evolution)Use case: Stripe API change management processDeprecation and sunsettingMark the feature or resource as deprecatedThe importance of dual-channel signalingDeprecate the narrowest viable unitInform and educate consumersImplementing an API change process for Magic Items StoreBackground: addressing early API design issuesPhase 1: Establishing an API change processStep 1: Defining the change policyStep 2: Creating a new resource variant for productsExample API call before and afterPhase 2: Managing the deprecation of /catalogStep 1: Announcing deprecation with clear communicationStep 2: Implementing a sunset strategy for /catalogPhase 3: Future-proofing API strategySummaryGet This Book’s PDF Version and Exclusive Extras
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Overview

RESTful API Design Patterns and Best Practices is your essential guide to understanding and implementing modern REST API design. You'll learn about key principles like user-centric and domain-driven design, and the importance of using OpenAPI and JSON Schema. This book goes beyond theory to offer practical advice, helping you design APIs that are functional and maintainable.

What this Book will help me do

Understand how to assess client needs to design valuable, user-focused APIs.
Gain practical knowledge of utilizing OpenAPI and JSON Schema for API standardization.
Learn essential concepts of API lifecycle management, including evolution and deprecation.
Apply domain-driven design principles to create robust and scalable API architectures.
Master best practices in REST API design and avoid common pitfalls to ensure success.

Author(s)

Andrzej Jarzyna and Samir AMZANI bring a wealth of experience in API design and software engineering. Andrzej is known for his expertise in implementing scalable systems using modern technologies, while Samir specializes in API architecture and technical project management. Together, they share their practical knowledge to help developers succeed in building robust APIs.

Who is it for?

This book is ideal for API developers, architects, and technical product owners who aim to advance their skills in API design. Whether you're a beginner with foundational knowledge of APIs and HTTP or a professional seeking to refine your methodologies, this guide will help you develop effective, scalable APIs that meet real-world needs.

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ISBN: 9781835885284

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