Mastering Code Architecture for Node.js Application

Trace the evolution from binary and assembly to high level languages, and learn how software architecture provides abstraction and a blueprint to manage complexity, enable scalability, and reduce costs.

Explore how the model, view, and controller exchange data, validate input, and interact with the database to support a task manager app, highlighting MVC benefits like maintainability and collaboration.

Separate configuration from code using a dot env file and a config directory for development, production, and test environments. Validate and expose these values with joy in a config module.

Learn how to organize and apply environment variables and request data validation by creating a dedicated validation directory, exporting schemas, and adding a validation middleware to safeguard data before saving.

Discover how middleware sits between requests and controllers to validate data with the Joy library, handling params, query, and body, and route valid data to the create block.

Master the catchAsync utility to replace try-catch in controllers, wrapping controller functions to forward errors to the next error handler via Promise.resolve in the utils folder.

Learn to implement an error converter middleware in Node.js that standardizes API error formats, handles validation and mongoose errors, and safely exposes messages to the front end.

Learn to handle requests to unknown paths with a 404 middleware and API error, and manage uncaught exceptions and unhandled promise rejections for graceful shutdown.

Use nodemon to auto-reload the app and move express server into a dedicated server.js. Build http server, export app, and add a sigterm listener for graceful shutdown on exit (ctrl+c).

Learn to implement winston logging in a Node.js app, using transports like console, file, and database, and create a reusable logger with levels and custom formats.

Configure the logger by environment to color logs in development and set debug for development and info for production, then replace console logs with logger calls and test with Postman.

Integrate Morgan as middleware in an express server to log http requests, including method, url, status, and response time, with console and accesslog.log file logging.

Create separate logs for successful and error responses with Morgan formats, including a custom error message token reading from response.locals, middleware integration, and skipping 400+ responses to focus on successes.

Move business logic into services, enabling controllers to access them and improve testability. Export modules with index files across directories to streamline imports and create a bulletproof boilerplate.