@ingeze/api-error/dist/handlers/express.js

A TypeScript library for handling HTTP errors in Express, NestJS, and Fastify APIs.

import { ErrorHandler, ValidationError } from "../errors/index.js";
import { ZodError } from "zod";
function expressErrorMiddleware(err, req, res, next) {
  if (res.headersSent) {
    return next(err);
  }
  if (err instanceof ErrorHandler) {
    res.status(err.statusCode).json({
      result: err.toJSON(),
      data: null,
      pagination: null
    });
    return;
  } else if (err instanceof ZodError) {
    const fieldErrors = {};
    for (const issue of err.issues) {
      const path = issue.path?.[0] ?? "unknown";
      const msg = issue.message;
      if (!fieldErrors[String(path)]) {
        fieldErrors[String(path)] = [];
      }
      fieldErrors[String(path)].push(msg);
    }
    const validationErr = new ValidationError({
      errors: fieldErrors
    });
    res.status(validationErr.statusCode).json({
      result: validationErr.toJSON(),
      data: null,
      pagination: null
    });
    return;
  } else {
    res.status(500).json({
      result: {
        success: false,
        statusCode: 500,
        type: "INTERNAL_SERVER_ERROR",
        message: "An unexpected error occurred"
      },
      data: null,
      pagination: null
    });
  }
}
export {
  expressErrorMiddleware
};
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