HarperDB Custom Functions: Building Powerful Server-Side Logic and APIs

"HarperDB Custom Functions: Building Powerful Server-Side Logic and APIs" is a practical guide for developers, architects, and DevOps professionals who want to unlock the full potential of HarperDB's custom functions. The book explores how HarperDB's distributed, modular architecture makes it possible to embed Node.js-based business logic directly alongside your data, enabling faster development, tighter data access, and more responsive applications. Readers will gain a clear understanding of how custom functions fit into the broader platform, including security considerations, lifecycle management, and API integration. From there, the book moves into proven implementation patterns for building reliable server-side logic and well-designed APIs. It covers RESTful endpoint design, middleware composition, schema enforcement, input validation, error handling, and documentation strategies that help teams build maintainable, scalable services. You'll also learn how to work effectively with HarperDB's hybrid query capabilities, transactional workflows, real-time streaming, and bulk operations to support demanding application requirements with confidence. The final chapters focus on real-world production concerns such as performance optimization, observability, security governance, and ecosystem integration. Through practical examples and case studies, the book demonstrates how custom functions can support microservices orchestration, edge deployments, SaaS tenant management, and compliance-driven environments. Whether you are modernizing legacy systems or designing new data-driven applications, this book provides the guidance needed to build powerful, resilient server-side logic and APIs with HarperDB.