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lang: en
title: 'API docs: rest.restserver._unexpectederrorhandler'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/rest
permalink: /doc/en/lb4/apidocs.rest.restserver._unexpectederrorhandler.html
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[Home](./index.md) > [@loopback/rest](./rest.md) > [RestServer](./rest.restserver.md) > [\_unexpectedErrorHandler](./rest.restserver._unexpectederrorhandler.md)
## RestServer.\_unexpectedErrorHandler() method
Get an Express handler for unexpected errors
<b>Signature:</b>
```typescript
protected _unexpectedErrorHandler(): ErrorRequestHandler;
```
<b>Returns:</b>
ErrorRequestHandler