---
url: /api/core/types/utils/function-is-observable.md
description: api documentation of isObservable from @tsed/core
---

## Usage

```typescript
import { isObservable } from "@tsed/core";
```

> See [/packages/core/src/utils/isObservable.ts](https://github.com/tsedio/tsed/blob/v8.37.1/packages/core/src/utils/isObservable.ts#L0-L0).

## Overview

```ts
function isObservable<T>(obj: any): obj is Observable<T>;
```

## Description

Checks if an object is an RxJS Observable by verifying lift and subscribe methods.