TypeScript and Databases: A Practical Guide

Modern web development is unthinkable without proper data handling, and TypeScript has become the standard for building reliable and scalable applications. The book "TypeScript and Databases: A Practical Guide" is a detailed guide that will help you master the art of integrating TypeScript with various database management systems.

What is this book about?

This is not just a syntax reference. You will journey from the basic principles of data schema design to creating full-fledged, secure, and high-performance backend services. The main focus is on practical aspects: you will learn to write typed queries, use ORMs (TypeORM, Prisma, Sequelize) and ODMs (Mongoose), and understand migrations and transactions.

Who is this book for?

• Beginner JavaScript/TypeScript developers who want to understand how to effectively interact with databases.
• Backend developers transitioning from other languages (Python, Java) to Node.js and TypeScript.
• Fullstack developers looking to deepen their knowledge of server-side data handling.
• Team Leads and architects seeking best practices for building reliable systems.

What will you learn?

• How to design typed schemas for relational (PostgreSQL, MySQL) and document-oriented (MongoDB) databases.
• Basics of working with SQL through TypeScript: writing safe queries, avoiding SQL injections.
• A complete guide to popular ORMs: setup, creating models, complex queries, pagination.
• Working with transactions and ACID properties in the context of typed code.
• Database migrations: automating schema changes without data loss.
• Performance optimization: indexes, lazy loading, the N+1 problem and ways to solve it.
• Security: password hashing, access control, protection against attacks.
• Testing code that works with databases: mocks, integration tests, test containers.

Each chapter contains real code examples, ready to use in your projects. The author emphasizes a TypeScript-first approach, showing how static typing helps avoid errors at compile time and makes the code self-documenting.

This book will become your reliable assistant in daily work — from the first database connection to deploying a production solution. Whether you are building microservices, REST APIs, or GraphQL endpoints, the knowledge from this guide will help you write clean, secure, and efficient code.