---
lang: en
title: 'API docs: express.middleware_context'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/express
permalink: /doc/en/lb4/apidocs.express.middleware_context.html
---

<!-- Do not edit this file. It is automatically generated by API Documenter. -->

[Home](./index.md) &gt; [@loopback/express](./express.md) &gt; [MIDDLEWARE\_CONTEXT](./express.middleware_context.md)

## MIDDLEWARE\_CONTEXT variable

A symbol to store `MiddlewareContext` on the request object. This symbol can be referenced by name, before it is created.

<b>Signature:</b>

```typescript
MIDDLEWARE_CONTEXT: unique symbol
```