# is-stream
> Check if something is a [Node.js stream](https://nodejs.org/api/stream.html)
## Install
```
$ npm install is-stream
```
## Usage
```js
import fs from 'node:fs';
import {isStream} from 'is-stream';
isStream(fs.createReadStream('unicorn.png'));
//=> true
isStream({});
//=> false
```
## API
### isStream(stream)
Returns a `boolean` for whether it's a [`Stream`](https://nodejs.org/api/stream.html#stream_stream).
#### isWritableStream(stream)
Returns a `boolean` for whether it's a [`stream.Writable`](https://nodejs.org/api/stream.html#stream_class_stream_writable).
#### isReadableStream(stream)
Returns a `boolean` for whether it's a [`stream.Readable`](https://nodejs.org/api/stream.html#stream_class_stream_readable).
#### isDuplexStream(stream)
Returns a `boolean` for whether it's a [`stream.Duplex`](https://nodejs.org/api/stream.html#stream_class_stream_duplex).
#### isTransformStream(stream)
Returns a `boolean` for whether it's a [`stream.Transform`](https://nodejs.org/api/stream.html#stream_class_stream_transform).
## Related
- [is-file-stream](https://github.com/jamestalmage/is-file-stream) - Detect if a stream is a file stream
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