Node.js Interview Speedrun: Building Secure Authentication from scratch

Published: 10 December 2025
on channel: The Commit Log

Stop using Passport.js. Build Auth correctly.

In this episode of The Commit Log, I speed-run a classic Senior Backend Interview question: Building a JWT Authentication System from scratch using Node.js, Express, and MongoDB.

The Architecture: We skip the spaghetti code. I break down a proper MVC Structure:

Controllers: Handling logic separate from routes.

Middleware: Protecting routes with custom JWT verification.

Security: Hashing passwords with bcrypt (never store plain text!).

👨‍💻 Source Code: [Link to your GitHub]

Timeline: 0:00 - The Interview Challenge 1:15 - Database Setup (MongoDB) 2:30 - The Logic (Bcrypt & JWT) 4:00 - The Middleware (Protecting Routes)

#Nodejs #ExpressJS #BackendDeveloper #CodingInterview #SystemDesign #JWT #WebDevelopment

C. Tags: #Nodejs #ExpressJS #Backend #API #Authentication #JWT #MongoDB #CodingInterview #SoftwareEngineer #WebDev #RestAPI #TheCommitLog #SpeedCoding #LearnToCode #JavaScript

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