TypeScript and Databases: A Practical Guide

The book "TypeScript and Databases: A Practical Guide" is a comprehensive textbook for developers who want to master working with databases in the TypeScript ecosystem. The author, Alexey Smirnov, a backend developer with 8 years of experience, systematically guides the reader from the basics of SQL to advanced patterns for working with TypeORM and Prisma.

What this book is about

The book covers all key aspects of TypeScript interaction with databases:

• SQL and Relational Database Basics — schema design, normalization, indexes, complex JOIN queries;
• Working with PostgreSQL — connection setup, connection pools, transactions, and migrations;
• TypeORM — a complete guide to ORM: entities, repositories, relations, data loading (eager/lazy), migrations;
• Prisma — a modern approach to working with databases: schema, client, migrations, working with enums and JSON fields;
• MongoDB and Mongoose — document-oriented databases: schemas, aggregations, indexes, transactions;
• Advanced Topics — pagination, full-text search, query caching, working with Redis;
• Testing — unit tests for repositories, integration tests with a test database, mock objects.

Who this book is for

• Junior developers — who know the basics of TypeScript and want to learn how to work with databases;
• Middle developers — who want to systematize their knowledge and master modern ORMs;
• Full-stack developers — who need a unified stack on TypeScript (frontend + backend + database);
• Students and course graduates — for in-depth study of backend development.

What you will learn after reading

• Design databases with performance requirements in mind;
• Write complex SQL queries and optimize them using EXPLAIN ANALYZE;
• Configure TypeORM and Prisma for real-world projects;
• Work with migrations and database schema versioning;
• Integrate MongoDB into TypeScript projects;
• Cover database code with tests and avoid common mistakes;
• Build reliable backend applications with a clean architecture.

All code examples are available in the GitHub repository and come with step-by-step instructions. The book is written in a lively language, without excessive theory — only practice that you can immediately apply in your work.

This is not just a reference book, but a full-fledged practical course that will help you become a confident backend developer in TypeScript.