The document discusses the use of Express.js, a popular Node.js web application framework, highlighting its ease of use and default architecture features such as routing and middleware. It addresses the challenges posed by overusing certain components like data validators and entity loaders, and emphasizes the importance of a clean controller pattern in managing business logic. Additionally, it provides insights into schema designs for data loading and error handling within Express.js applications.

1. Unnamed Project
Original faults and profits

2. ExpressJS: Disposable Hero

3. - Express.js is the most popular Node.js web application framework used
today
- Not enough experience to understand our needs
- Easy to jump in
Why did we choose ExpressJS?

4. ExpressJS: Default architecture

5. - Routing
- Middlewares
ExpressJS: Key points

6. ExpressJS: Clean Controller
problem of overusing

7. ExpressJS: Clean Controller
problem of overusing
Data Validators

8. ExpressJS: Clean Controller
problem of overusing
Data Validators
Entity Loaders

9. ExpressJS: Clean Controller
problem of overusing
Data Validators
Access Control
Entity Loaders

10. ExpressJS: Clean Controller
problem of overusing
Data Validators
Access Control
Entity Loaders
Data Mappers

11. ExpressJS: Clean Controller
problem of overusing
Data Validators
Access Control
Entity Loaders
Data Mappers
Business Logic

12. ExpressJS: Clean Controller
problem of overusing
const controller = {
};
Data Validators
Access Control
Entity Loaders
Data Mappers
Business Logic

13. validator
middleware
entity loader access control data mapper controller
middleware middleware middleware middleware
ExpressJS: Clean Controller
cleaning out - short flow schema

14. - Load data from source (database)
- Modify request by assigning loaded data to access it from controller
ExpressJS: Clean Controller
cleaning out - entity loader schema

15. ExpressJS: Clean Controller
cleaning out - full flow schema
error error error
success success success success
errorerror
success
validator entity loader
access
control
data mapper controller
top level error handler
request response

16. ExpressJS: Clean Controller
cleaning out

17. ExpressJS: Clean Controller
cleaning out - using events
Event handler
Module A Module B Module C Controller
request response
“Background” functionality

18. Name: Roman Sachenko
Email: roman.sachenko@gmail.com
Skype: roman.sachenko

19. DA - 14 2016