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

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[Home](./index.md) &gt; [@loopback/logging](./logging.md) &gt; [WINSTON\_FORMAT](./logging.winston_format.md)

## WINSTON\_FORMAT variable

An extension point for winston formats

**Signature:**

```typescript
WINSTON_FORMAT = "logging.winston.format"
```