---
title: IsSessionFunction
---

# IsSessionFunction

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[MODES: framework, data]

## Summary

[Reference Documentation ↗](https://api.reactrouter.com/v8/types/react-router.IsSessionFunction.html)

A function that determines whether a value is a React Router [`Session`](https://api.reactrouter.com/v8/interfaces/react-router.Session.html)
object.

## Signature

```tsx
type IsSessionFunction = (object: any) => object is Session;
```

## Params

### object

The value to check.

## Returns

`true` if the value is a React Router [`Session`](https://api.reactrouter.com/v8/interfaces/react-router.Session.html) object;
otherwise, `false`.