Structuring node.js projects - Seven Peaks Software (Node.JS Meetup 18 nov 2021)
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Denis is a professional programmer who has 12+ years of experience working in various startups! Denis was dive deep into Structuring your Node.JS app, DI Container, Async Local Storage, Request handlers, Services, Unit of Work and Testing. For more info about Seven Peaks Software: https://lnkd.in/g2jMsDy
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Structuring node.js projects - Seven Peaks Software (Node.JS Meetup 18 nov 2021)
- 1. Structuring Node.js Projects In an opinionated way with Denis Pshenov
- 2. Structuring Node.ts Projects In an opinionated way with Denis Pshenov
- 3. Which way to go? Opinionated vs Flexible Convention vs Configuration Declarative vs Procedural Open-Source vs In-House
- 4. Which way to go? Opinionated vs Flexible Convention vs Configuration Declarative vs Procedural Open-Source vs In-House Nest.js Next.js Express.js
- 5. Application is an event processor
- 6. Application is an event processor
- 7. Application is an event processor
- 8. ActiveMQ API Gateway HTTP API Websocket Kinesis & DynamoDB S3 Schedule SNS SQS Application Load Balancer Alexa Skill Serverless Framework Alexa Smart Home IoT CloudWatch Event CloudWatch Log EventBridge Event CloudFront Cognito User Pool MSK IoT Fleet Provisioning Kafka RabbitMQ AWS Events for Lambda
- 11. Simple Express.js Route Handler
- 12. Simple Express.js Route Handler
- 13. Place logic into service layer
- 14. Use Case Handler
- 15. Use Case Request
- 18. Use Case Routing Validate request Handle request Transform response Send response
- 20. Folder Structure
- 22. Offloading request validation to data layer Common problems seen in the wild
- 23. Returning objects straight from the database Common problems seen in the wild
- 24. Singletons for service layer Difficult to test Difficult to maintain Less separation of concerns Common problems seen in the wild
- 25. Still difficult to test Still difficult to maintain More boilerplate code Common problems seen in the wild Manual instantiation of dependencies
- 26. Difficult to type correctly (TS) Difficult to pass down the dependency tree Common problems seen in the wild Attaching stuff to `req`
- 27. Services
- 28. We need a DI Container
- 29. Handler Service
- 30. Folder Structure
- 31. But how can we have a request scoped singleton?
- 32. We cannot put user into the global container
- 33. So we need a request scoped container
- 34. All the magic still happens in the infrastructure layer
- 37. Where is the business logic? Domain Driven Design
- 38. Folder Structure
- 40. A few more things... Error handling (middleware) ORM (MikroORM ❤) Testing – focus on integrations tests if you have limited resources