/**
* Error Handler Middleware
*
* Centralized error handling for HTTP layer.
*/
import type { Request, Response, NextFunction } from 'express';
/**
* HTTP error with status code
*/
export class HttpError extends Error {
constructor(
public statusCode: number,
message: string
) {
super(message);
this.name = 'HttpError';
}
}
/**
* Create a 400 Bad Request error
*/
export function badRequest(message: string): HttpError {
return new HttpError(400, message);
}
/**
* Create a 404 Not Found error
*/
export function notFound(message: string): HttpError {
return new HttpError(404, message);
}
/**
* Create a 500 Internal Server Error
*/
export function internalError(message: string): HttpError {
return new HttpError(500, message);
}
/**
* Error handler middleware.
* Must be registered last in the middleware chain.
*/
export function errorHandler(
err: Error,
req: Request,
res: Response,
_next: NextFunction
): void {
console.error(`[HTTP] Error: ${err.message}`);
if (err instanceof HttpError) {
res.status(err.statusCode).json({
error: err.message,
statusCode: err.statusCode,
});
return;
}
// Default to 500 for unknown errors
res.status(500).json({
error: 'Internal server error',
statusCode: 500,
});
}
