KITFORMA · EDITORIAL GUIDE
Why does a Node.js download use more memory than the file being transferred?
KitForma editorial guide. A producer can enqueue data faster than the destination consumes it. Ignoring stream backpressure allows buffered chunks to accumulate.
Step-by-step guidance
A producer can enqueue data faster than the destination consumes it. Ignoring stream backpressure allows buffered chunks to accumulate.
Prefer
pipeline from node:stream/promises for a complete stream chain. If manually writing, stop when write() returns false and resume after drain. Test with a deliberately slow destination and observe resident memory rather than only transfer speed. The high-water mark is a buffering threshold, not a strict total process-memory cap. Transform stages can still retain their own data, and converting the entire stream to an array defeats the streaming design.Sources and verification
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