NodeJS: What's the difference between a Duplex stream and a Transform stream?

Question

The Stream docs state that Duplex Streams \"are streams that implement both the Readable and Writable interfaces\" and Transform Streams \"are Duplex streams where the outpu

Answer 1

The difference is just syntactic sugar. Transform streams are full duplex streams but rather than implementing _write and _read methods, you are asked to implement just the _transform method. You can read more about streams on the excellent substack's streams guide or from Isaacs's readable-stream repo.