Structured Express API

import type { NextFunction, Request, Response } from "express";

export function requestLogger(req: Request, res: Response, next: NextFunction) {
  const start = Date.now();
  res.on("finish", () => {
    console.log(req.method + " " + req.originalUrl + " -> " + res.statusCode + " (" + (Date.now() - start) + "ms)");
  });
  next();
}

export class HttpError extends Error {
  constructor(
    public status: number,
    message: string,
  ) {
    super(message);
  }
}

// eslint-disable-next-line @typescript-eslint/no-unused-vars
export function errorHandler(err: unknown, _req: Request, res: Response, _next: NextFunction) {
  if (err instanceof HttpError) return res.status(err.status).json({ error: err.message });
  console.error(err);
  return res.status(500).json({ error: "Internal server error" });
}