src/middlewares/ErrorHandler.ts


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import { NextFunction, Request, Response } from "express";
import { HTTPError } from "lambert-server";
import { FieldError } from "../util/instanceOf";

export function ErrorHandler(error: Error, req: Request, res: Response, next: NextFunction) {
	let code = 400;
	let httpcode = code;
	let message = error?.toString();
	let errors = undefined;

	if (error instanceof HTTPError && error.code) code = httpcode = error.code;
	else if (error instanceof FieldError) {
		code = Number(error.code);
		message = error.message;
		errors = error.errors;
	} else {
		console.error(error);
		if (req.server.options.production) {
			message = "Internal Server Error";
		}
		code = httpcode = 500;
	}

	res.status(httpcode).json({ code: code, message, errors });
	return next();
}