How to pipe one readable stream into two writable streams at once in Node.js?

Question

The goal is to:

1. Create a file read stream.
2. Pipe it to gzip (zlib.createGzip())

3. Then pipe the read stream of zlib output to:

Answer 1

I found that zlib returns a readable stream which can be later piped into multiple other streams. So I did the following to solve the above problem:

var sourceFileStream = fs.createReadStream(sourceFile);
// Even though we could chain like
// sourceFileStream.pipe(zlib.createGzip()).pipe(response);
// we need a stream with a gzipped data to pipe to two
// other streams.
var gzip = sourceFileStream.pipe(zlib.createGzip());

// This will pipe the gzipped data to response object
// and automatically close the response object.
gzip.pipe(response);

// Then I can pipe the gzipped data to a file.
gzip.pipe(fs.createWriteStream(targetFilePath));