TypeScript and Databases: A Practical Guide

The book "TypeScript and Databases: A Practical Guide" is a comprehensive resource for developers who want to master modern approaches to working with databases in the TypeScript ecosystem. Unlike typical textbooks, this book focuses on practical aspects: from schema design to optimizing the performance of complex queries.

Who is this book for?

• Junior and Middle JavaScript/TypeScript developers looking to deepen their knowledge of databases;
• Backend engineers transitioning from other languages to the Node.js + TypeScript stack;
• Fullstack developers who want to build reliable and scalable applications;
• Students and interns studying modern web development.

What will you learn from the book?

• TypeScript fundamentals: strong typing, generics, utility types as applied to working with data;
• Schema design for PostgreSQL, MySQL, MongoDB, and SQLite with TypeScript types in mind;
• Working with popular ORMs: Prisma, TypeORM, Drizzle — configuration, migrations, complex relationships;
• Typing SQL queries using libraries like Kysely and Slonik;
• Repository, Unit of Work, and Data Mapper patterns in TypeScript;
• Query optimization, indexing, working with transactions and connection pools;
• Testing code that interacts with the database: mocks, integration tests, test containers;
• Deploying applications in Docker and cloud environments.

Why is this book important?

TypeScript has become the standard for serious Node.js projects, but working with databases in it often remains a "gray area." This book bridges the gap between type theory and real-world backend tasks. You will learn to write code that not only compiles but also guarantees data integrity at the type level — errors that previously only appeared at runtime will be caught during development.

Each chapter contains ready-to-use examples that can be immediately applied to your project. At the end of the book, you will find a step-by-step guide to building a full-fledged API with authentication, pagination, and complex queries — from schema design to deployment.

"TypeScript and Databases: A Practical Guide" is not just a reference book, but a desktop companion for everyone who wants to write reliable, maintainable, and performant code that works with data.