# Dependency Injection and Dependency Inversion in Node.js and TypeScript

DevFeed: [Dependency Injection and Dependency Inversion in Node.js and TypeScript](<https://devfeed.tech/articles/dependency-injection-in-node-js-typescript-the-part-nobody-teaches-you-18108.md>)

Original publisher: [Read original article](<https://thetshaped.dev/p/dependency-injection-in-nodejs-and-typescript-dependency-inversion-part-no-body-teaches-you>)

Author: Petar Ivanov

Published: 2026-03-29T12:19:37Z

Content type: tutorial

Language: en

Sources: [The T-Shaped Dev](<https://devfeed.tech/sources/the-t-shaped-dev.md>)

Topics: [Dependency injection](<https://devfeed.tech/topics/dependency-injection.md>), [Node.js](<https://devfeed.tech/topics/node-js.md>), [Dependency Inversion](<https://devfeed.tech/topics/dependency-inversion.md>), [TypeScript](<https://devfeed.tech/topics/typescript.md>), [Express](<https://devfeed.tech/topics/express.md>), [PostgreSQL](<https://devfeed.tech/topics/postgresql.md>), [Drizzle](<https://devfeed.tech/topics/drizzle.md>), [SendGrid](<https://devfeed.tech/topics/sendgrid.md>), [Amazon Web Services](<https://devfeed.tech/topics/aws.md>)

Tags: [dependency-inversion](<https://devfeed.tech/tags/dependency-inversion.md>), [di](<https://devfeed.tech/tags/di.md>), [node-js](<https://devfeed.tech/tags/node-js.md>), [testing](<https://devfeed.tech/tags/testing.md>), [typescript](<https://devfeed.tech/tags/typescript.md>)

## AI overview

A tutorial on using plain TypeScript dependency injection in Node.js. It distinguishes dependency injection from dependency inversion and argues that explicit dependencies can improve testability and make implementations easier to swap.

## Source excerpt

Learn the hidden costs about importing everything directly and the structural change you need to make. (8 min)