---
title: "createContextKey"
source: "https://github.com/remix-run/remix/blob/8905f3943706e1f53696ab83e70a84873cabfc90/packages/fetch-router/src/lib/request-context.ts#L12"
---

# createContextKey

## Summary

Create a request context key with an optional default value.

## Signature

```ts
function createContextKey<value>(): ContextKey<value>

function createContextKey<value>(defaultValue: value): ContextKey<value> & { defaultValue: value }

```

## Parameters

### `defaultValue`

The default value for the context key

## Returns

The new context key