JavaScript/TypeScript Error Handling Guide

Help me implement proper error handling in my JavaScript/TypeScript application.

App type: [FRONTEND / BACKEND / FULL-STACK]
Framework: [REACT / NODE / EXPRESS / NEXT.JS / OTHER]

Current error handling: [MINIMAL / INCONSISTENT / WANT TO IMPROVE]

Provide:
1. **Error Types**: Custom error classes for different error categories
2. **Try-Catch Strategy**: When and how to use try-catch effectively
3. **Async Error Handling**: Handling errors in promises and async/await
4. **API Error Responses**: Consistent error response format
5. **Client-Side Errors**: Error boundaries and user-facing error messages
6. **Validation Errors**: Input validation and error formatting
7. **Logging Strategy**: What to log and at what level
8. **Global Error Handler**: Catching unhandled errors
9. **Retry Logic**: When and how to retry failed operations
10. **Error Monitoring**: Setting up error tracking (Sentry, etc.)

Help me implement proper error handling in my JavaScript/TypeScript application.

App type: [FRONTEND / BACKEND / FULL-STACK]
Framework: [REACT / NODE / EXPRESS / NEXT.JS / OTHER]
Current error handling: [MINIMAL / INCONSISTENT / WANT TO IMPROVE]

Provide:
1. **Error Types**: Custom error classes for different error categories
2. **Try-Catch Strategy**: When and how to use try-catch effectively
3. **Async Error Handling**: Handling errors in promises and async/await
4. **API Error Responses**: Consistent error response format
5. **Client-Side Errors**: Error boundaries and user-facing error messages
6. **Validation Errors**: Input validation and error formatting
7. **Logging Strategy**: What to log and at what level
8. **Global Error Handler**: Catching unhandled errors
9. **Retry Logic**: When and how to retry failed operations
10. **Error Monitoring**: Setting up error tracking (Sentry, etc.)