--- title: "Discussion on \"A guide to reading and writing Node.js streams\" | Hashnode" description: "Discussion on \"A guide to reading and writing Node.js streams\". By the end of this guide, you will have a deep understanding of how streams work, including creating and managing readable and writable streams, handling ba" url: "https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d" --- [Feed](https://hashnode.com/feed) / Discussion # [A guide to reading and writing Node.js streams](https://blog.platformatic.dev/a-guide-to-reading-and-writing-nodejs-streams?utm_source=hashnode&utm_medium=feed) By the end of this guide, you will have a deep understanding of how streams work, including creating and managing readable and writable streams, handling ba Jul 11, 2024 · 13 min read · blog.platformatic.dev Read the article - [#nodejs](https://hashnode.com/tag/nodejs) - [#nodejs-streams](https://hashnode.com/tag/nodejs-streams) - [#streams](https://hashnode.com/tag/streams) - [#platformatic](https://hashnode.com/tag/platformatic) ## Written by [Matteo Collina](https://hashnode.com/@matteocollina) @matteocollina [View profile](https://hashnode.com/@matteocollina) Open Sourcerer, Node.js TSC member, Fastify Lead Maintainer ## Responses 6 Markdown supported · ⌘↵ to post [Emma Raducanu](https://hashnode.com/@raducanue70) [Aug 16, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/66bf7c034758db5019603d3e) I NEED A HACKER TO RECOVER MY LOST CRYPTOS VISIT \[ ROCKET SPEED RECOVERY HACKER \] My name is Emma Raducanu and I am from Toronto, Canada well known as a Professional Tennis Player. 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WhatsApp .. +1 (269) 369–5436 Email… rocketspeedrecoveryhacker@seznam.cz Telegram..[t.me/rocketspeedrecoveryhacker](http://t.me/rocketspeedrecoveryhacker) [Jackson David](https://hashnode.com/@jackson943) [Aug 13, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/66baec5fe2f22beb3be3a55a) i live in Canada a friend introduces me to blank atm card which i got from Davidwilson hackers, i believe him so well not like scammers out there i have withdrew $50000 with this card so i decided to share a testimony if you are interested contact him now for Financial Solutions Davidwilson2284@gmail.com [Esten Grove](https://hashnode.com/@Esten) [Aug 2, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/66ad5f433f8465a4805c5432) Really great article. Would love for an in depth article on async generators. Saw a library recently using them for streams & it seemed very concise. Would be interested to leer more. [Stasa Stanisic](https://hashnode.com/@stasas) [Jul 20, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/669bc4c5e7c7f0d1d346a3c6) Thank you for a great streams overview! How would you write out the correct version of HTTP stream example with stream/promises pipeline, pass res as last parameter? And for fastify, reply.send? [Matteo Collina](https://hashnode.com/@matteocollina) [Jul 25, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/669bc4c5e7c7f0d1d346a3c6#reply-66a223b1f67fe113f8fcb4d2) use `@fastify/static` :). Don't stream files directly because there are infinite edge cases that will inevitably result in a security issues in your server. [Stasa Stanisic](https://hashnode.com/@stasas) [Jul 25, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/669bc4c5e7c7f0d1d346a3c6#reply-66a22736f9ee50415797da53) [Matteo Collina](https://hashnode.com/@matteocollina) Thanks for the reply! Yes, understood for static files which can be directly served, but I was thinking more of the case when there is a pipeline - reading file then transforming and finally sending as a response... [Matteo Collina](https://hashnode.com/@matteocollina) [Jul 25, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/669bc4c5e7c7f0d1d346a3c6#reply-66a2459182434a49dc324bcc) [Stasa Stanisic](https://hashnode.com/@stasas) you can just call `reply.send(stream)` or `return stream` in your Fastify route. Using barebone HTTP, you should do `pipeline(a, b, c, res, (err) => { ... })`. [Sarfraz Ashrafi](https://hashnode.com/@MohammedSarfraz) [Jul 20, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/669b9d40ec44bd003c3b10e1) thank you mate informative [Priyankar Pal](https://hashnode.com/@priyankarpal1) [Jul 20, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/669b35d2ee40ae2f2205fd0b) Well written article. How did you design the diagram? [Matteo Collina](https://hashnode.com/@matteocollina) [Jul 25, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/669b35d2ee40ae2f2205fd0b#reply-66a2223530807b6f84e024a3) We have an amazing designer at platformatic :). [Jason Jiang](https://hashnode.com/@jasonjiang7) [Jul 18, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/6698f792d8d1c8446fa805d5) Thanks for the great guide, and I was confused with the Writeable demo: Why the "wait drain" was logged after only one HELLO is logged to stdout, I assume the buffer was empty after the first HELLO logged, the 2nd HELLO should also be logged before the first "wait drain", not sure where did i misunderstood, is this because the stdout.write is async, after calling the "cb", the "hello" in the buffer will be removed? [Matteo Collina](https://hashnode.com/@matteocollina) [Jul 25, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/6698f792d8d1c8446fa805d5#reply-66a2236196271f659e5801b5) Good spot! The buffer is flushed on first write. Because the `cb` will be called after an event loop turn (it's async!), we need to wait for `drain`. To counteract this effect there are cork() and uncork(). They are used to send out the http headers for example. [Vineeth Kasula](https://hashnode.com/@vineethKasula) [Jul 12, 2024](https://hashnode.com/posts/a-guide-to-reading-and-writing-nodejs-streams/668fd751e5d695eed5680b4d/comment/66913571ca3928be95d3e06e) Thanks, This is really helpful