Authentication, Security & Testing for Node.js
Make a Node.js and Express API production-ready: password hashing, session and JWT authentication, role-based authorization, input validation, security hardening, and automated testing with Jest and Supertest.
Welcome to Authentication, Security & Testing for Node.js, the third course in a backend development track. Every project so far has been open to anyone, no login, no protected routes, no automated way to catch a regression before it ships. This course closes those gaps: real authentication, real authorization, real input validation, real security hardening, and a real automated test suite, the difference between a working API and a production-ready one.
⚠️ Prerequisite: This course requires working knowledge of Node.js, Express, MVC structure, and a database-backed model layer (Prisma or Mongoose), covered in Node.js & Express Foundations and Databases & ORMs for Node.js. If you haven’t taken those courses, start there first.
Why This Course?
Knowing how to build a REST API isn’t the same as knowing how to secure one. This course starts with the most fundamental security mistake, storing a password in plain text, and builds up from there: hashing passwords correctly, authenticating users with sessions and then with JWTs, restricting access by role, validating every input before it reaches application logic, and hardening an API against the attacks real APIs actually face. It closes with automated testing, unit tests with Jest and integration tests with Supertest, so a change that breaks something gets caught before a user finds it.
What Makes It Different
- Every code example in this course is written to actually run, verified against a real Node.js process, not described from memory.
- Covers both major authentication patterns, session-based and token-based (JWT), with real trade-offs, not just one presented as “the” way to do it.
- Treats input validation and security hardening as first-class topics with real attack demonstrations, not a single paragraph of warnings.
- Ends with a real, automated test suite, unit and integration tests, not just “testing is important” without ever writing one.
Learning Format
Each module builds on the last: concepts are introduced with runnable, verified examples, then practiced in hands-on exercises. By the end of the course, every piece, authentication, authorization, validation, hardening, and testing, comes together in one production-ready API.
Final Outcome
By the end of this course, you’ll be able to take a working Express API and make it genuinely production-ready: real authentication, real authorization, validated input, hardened against common attacks, and backed by a real automated test suite. From here, the next course in this track picks up scaling and deployment, taking a production-ready application and actually shipping it.