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How does the authentication system work?
What's the data flow for user registration?
Explain the caching mechanism in this repo
Where is the API rate limiting implemented?

How does the error handling work in this codebase?

This codebase uses a centralized error handling approach with custom error classes and middleware:

// Custom error classes
class AppError extends Error {
  constructor(message, statusCode) {
    super(message);
    this.statusCode = statusCode;
    this.status = `${statusCode}`.startsWith('4') ? 'fail' : 'error';
    this.isOperational = true;
    
    Error.captureStackTrace(this, this.constructor);
  }
}

// Global error handling middleware
const errorHandler = (err, req, res, next) => {
  err.statusCode = err.statusCode || 500;
  err.status = err.status || 'error';
  
  // Different handling for development vs production
  if (process.env.NODE_ENV === 'development') {
    sendDevError(err, res);
  } else {
    sendProdError(err, res);
  }
};

VS Code•Cursor•Claude Code

auth.service.ts

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { BehaviorSubject, Observable } from 'rxjs';
import { map, tap } from 'rxjs/operators';
import { User } from '../models/user.model';
import { environment } from '../../environments/environment';

@Injectable({
  providedIn: 'root'
})
export class AuthService {
  private currentUserSubject: BehaviorSubject<User | null>;
  public currentUser: Observable<User | null>;

  constructor(private http: HttpClient) {
    this.currentUserSubject = new BehaviorSubject<User | null>(
      JSON.parse(localStorage.getItem('currentUser') || 'null')
    );
    this.currentUser = this.currentUserSubject.asObservable();
  }

  public get currentUserValue(): User | null {
    return this.currentUserSubject.value;
  }

  login(email: string, password: string) {
    return this.http.post<any>(`${environment.apiUrl}/auth/login`, { email, password })
      .pipe(
        map(response => {
          // store user details and jwt token in local storage
          localStorage.setItem('currentUser', JSON.stringify(response.user));
          localStorage.setItem('token', response.token);
          this.currentUserSubject.next(response.user);
          return response.user;
        })
      );
  }

  logout() {
    // remove user from local storage
    localStorage.removeItem('currentUser');
    localStorage.removeItem('token');
    this.currentUserSubject.next(null);
  }
}

How does this auth service handle token expiration?

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