is-stream

Check if something is a Node.js stream

Install

npm install is-stream

Usage

import fs from 'node:fs';
import {isStream} from 'is-stream';

isStream(fs.createReadStream('unicorn.png'));
//=> true

isStream({});
//=> false

API

isStream(stream, options?)

Returns a boolean for whether it's a Stream.

isWritableStream(stream, options?)

Returns a boolean for whether it's a stream.Writable, an http.OutgoingMessage, an http.ServerResponse or an http.ClientRequest.

isReadableStream(stream, options?)

Returns a boolean for whether it's a stream.Readable or an http.IncomingMessage.

isDuplexStream(stream, options?)

Returns a boolean for whether it's a stream.Duplex.

isTransformStream(stream, options?)

Returns a boolean for whether it's a stream.Transform.

Options

checkOpen

Type: boolean
Default: false with isStream(), true with the other methods

When this option is true, the method returns false if the stream has already been closed.

Related

• is-file-stream - Detect if a stream is a file stream