ML SystemPart 3: Chapter 10
CH.10 ~20 min
Code Quality
Validation, Errors, and ESLint.
ValidationESLintErrors
- Implement built-in and custom validators in Mongoose schemas.
- Create a centralized error-handling middleware in Express.
- Configure ESLint rules to maintain consistent code style.
01 Validation & Error Handling Viz
Definition
Validation Middleware
A centralized error-handling middleware in Express that catches exceptions and returns appropriate HTTP status codes (e.g., 400 Bad Request).
Centralized Error Handling
Instead of duplicating try-catch blocks everywhere, delegate errors to a specialized middleware that analyzes error names and formats response messages.
02 Static Analysis & ESLint
- **Standard Indentation**: Enforcing 2-space tabs.
- **EqEqEq**: Requiring strict equality operators (=== and !==).
- **Linebreaks**: Standardizing on Unix-style linebreaks.
Key Takeaways
- 1Enforce data integrity at the database level using Mongoose validators.
- 2Centralized error-handling middleware simplifies backend logic.
- 3ESLint ensures consistent code quality across the entire development team.
CH.10
Chapter Complete
Chapter Progress
Reading
Exercise
Interact with the visualization
Quiz
Chapter Quiz
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