Node.js REST API with Express and MongoDB: A to Z Guide
Build a production-ready REST API from scratch using Node.js, Express, and MongoDB with authentication and validation.
Abdur Razzak
Full-Stack Web Developer
Project Structure
Organise your Express app by feature, not by file type. Each feature module gets its own folder with a route, controller, service, and model file. This separation makes testing and maintenance dramatically easier as the project scales.
Connecting to MongoDB
Use Mongoose to define schemas and models. Store the connection string in an environment variable and connect once at application startup. Handle connection events to log success and gracefully handle failures.
Input Validation with Zod
Never trust user input. Use Zod to define schemas and validate request bodies before they reach your service layer. Return descriptive validation errors with HTTP 400 so API consumers know exactly what went wrong.
JWT Authentication
Sign a JWT on login and verify it in an auth middleware for protected routes. Store the secret in an environment variable, set a reasonable expiry, and refresh tokens before they expire to keep users logged in without compromising security.
