Streams 101
There are four fundamental stream types in Node.js: Readable, Writable, Duplex, and Transform streams.
- A readable stream is an abstraction for a source from which data can be consumed. An example of that is the fs.createReadStream method.
- A writable stream is an abstraction for a destination to which data can be written. An example of that is the fs.createWriteStream method.
- A duplex streams is both Readable and Writable. An example of that is a TCP socket.
- Transform streams are basically a duplex stream that can be used to modify or transform the data as it is written and read.
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