# isstream

> Determine if an object is a Stream

Latest version **0.1.2** (published 2015-03-07) · MIT license · 0 weekly downloads

## Install

```sh
npm install isstream
pnpm add isstream
yarn add isstream
bun add isstream
```

## Health

**Score 23/100 (F)** — status: abandoned.

Positive: has types package; no vulnerabilities; high quality score.

Warnings: low downloads; no esm support; pre 1.0.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 0.1.2 |
| Published | 2015-03-07 |
| First published | 2014-04-07 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | separate (@types/isstream) |
| Module format | CommonJS |
| Dependencies | 0 |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 63 |
| Author | Rod Vagg |
| Maintainers | rvagg |
| Keywords | stream, type, streams, readable-stream, hippo |

## Links

- npm: https://www.npmjs.com/package/isstream
- Repository: https://github.com/rvagg/isstream
- Issues: https://github.com/rvagg/isstream/issues
- npm.io page: https://npm.io/package/isstream

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## Recent versions

- 0.1.2 (latest) — 2015-03-07
- 0.1.1 — 2014-12-08
- 0.1.0 — 2014-04-07
- 0.0.0 — 2014-04-07

## README

# isStream

[![Build Status](https://secure.travis-ci.org/rvagg/isstream.png)](http://travis-ci.org/rvagg/isstream)

**Test if an object is a `Stream`**

[![NPM](https://nodei.co/npm/isstream.svg)](https://nodei.co/npm/isstream/)

The missing `Stream.isStream(obj)`: determine if an object is standard Node.js `Stream`. Works for Node-core `Stream` objects (for 0.8, 0.10, 0.11, and in theory, older and newer versions) and all versions of **[readable-stream](https://github.com/isaacs/readable-stream)**.

## Usage:

```js
var isStream = require('isstream')
var Stream = require('stream')

isStream(new Stream()) // true

isStream({}) // false

isStream(new Stream.Readable())    // true
isStream(new Stream.Writable())    // true
isStream(new Stream.Duplex())      // true
isStream(new Stream.Transform())   // true
isStream(new Stream.PassThrough()) // true
```

## But wait! There's more!

You can also test for `isReadable(obj)`, `isWritable(obj)` and `isDuplex(obj)` to test for implementations of Streams2 (and Streams3) base classes.

```js
var isReadable = require('isstream').isReadable
var isWritable = require('isstream').isWritable
var isDuplex = require('isstream').isDuplex
var Stream = require('stream')

isReadable(new Stream()) // false
isWritable(new Stream()) // false
isDuplex(new Stream())   // false

isReadable(new Stream.Readable())    // true
isReadable(new Stream.Writable())    // false
isReadable(new Stream.Duplex())      // true
isReadable(new Stream.Transform())   // true
isReadable(new Stream.PassThrough()) // true

isWritable(new Stream.Readable())    // false
isWritable(new Stream.Writable())    // true
isWritable(new Stream.Duplex())      // true
isWritable(new Stream.Transform())   // true
isWritable(new Stream.PassThrough()) // true

isDuplex(new Stream.Readable())    // false
isDuplex(new Stream.Writable())    // false
isDuplex(new Stream.Duplex())      // true
isDuplex(new Stream.Transform())   // true
isDuplex(new Stream.PassThrough()) // true
```

*Reminder: when implementing your own streams, please [use **readable-stream** rather than core streams](http://r.va.gg/2014/06/why-i-dont-use-nodes-core-stream-module.html).*


## License

**isStream** is Copyright (c) 2015 Rod Vagg [@rvagg](https://twitter.com/rvagg) and licenced under the MIT licence. All rights not explicitly granted in the MIT license are reserved. See the included LICENSE.md file for more details.

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_Source: https://npm.io/package/isstream · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._