API with NestJS #31. Two-factor Authentication

API with NestJS #31. Two-factor Authentication - We go through the principles of two-factor authentication and put them into practice with NestJS and Google Authenticator.

• 1.  API with NestJS #1. Controllers, routing and the module structure
• 2.  API with NestJS #2. Setting up a PostgreSQL database with TypeORM
• 3.  API with NestJS #3. Authenticating users with bcrypt, Passport, JWT, and cookies
• 4.  API with NestJS #4. Error handling and data validation
• 5.  API with NestJS #5. Serializing the response with interceptors
• 6.  API with NestJS #6. Looking into dependency injection and modules
• 7.  API with NestJS #7. Creating relationships with Postgres and TypeORM
• 8.  API with NestJS #8. Writing unit tests
• 9.  API with NestJS #9. Testing services and controllers with integration tests
• 10.  API with NestJS #10. Uploading public files to Amazon S3
• 11.  API with NestJS #11. Managing private files with Amazon S3
• 12.  API with NestJS #12. Introduction to Elasticsearch
• 13.  API with NestJS #13. Implementing refresh tokens using JWT
• 14.  API with NestJS #14. Improving performance of our Postgres database with indexes
• 15.  API with NestJS #15. Defining transactions with PostgreSQL and TypeORM
• 16.  API with NestJS #16. Using the array data type with PostgreSQL and TypeORM
• 17.  API with NestJS #17. Offset and keyset pagination with PostgreSQL and TypeORM
• 18.  API with NestJS #18. Exploring the idea of microservices
• 19.  API with NestJS #19. Using RabbitMQ to communicate with microservices
• 20.  API with NestJS #20. Communicating with microservices using the gRPC framework
• 21.  API with NestJS #21. An introduction to CQRS
• 22.  API with NestJS #22. Storing JSON with PostgreSQL and TypeORM
• 23.  API with NestJS #23. Implementing in-memory cache to increase the performance
• 24.  API with NestJS #24. Cache with Redis. Running the app in a Node.js cluster
• 25.  API with NestJS #25. Sending scheduled emails with cron and Nodemailer
• 26.  API with NestJS #26. Real-time chat with WebSockets
• 27.  API with NestJS #27. Introduction to GraphQL. Queries, mutations, and authentication
• 28.  API with NestJS #28. Dealing in the N + 1 problem in GraphQL
• 29.  API with NestJS #29. Real-time updates with GraphQL subscriptions
• 30.  API with NestJS #30. Scalar types in GraphQL
• 31. API with NestJS #31. Two-factor authentication

While developing our application, security should be one of our main concerns. One of the ways we can improve it is by implementing a two-factor authentication mechanism. This article goes through its principles and puts them into practice with NestJS and Google Authenticator.

Adding two-factor authentication

The core idea behind two-factor authentication is to confirm the user’s identity in two ways. There is an important distinction between two-step authentication and two-factor authentication. A common example is with the ATM. To use it, we need both a credit card and a PIN code. We call it a two-factor authentication because it requires both something we have and something we know. For example, requiring a password and a PIN code could be called a two-step flow instead.

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