How to Use io.LimitReader to Prevent Memory Exhaustion

Wrap your io.Reader with io.LimitReader to enforce a maximum byte count and prevent memory exhaustion. This wrapper stops reading once the limit is reached, returning io.EOF.

import "io"

// Limit reading to 10MB (10 * 1024 * 1024 bytes)
limitedReader := io.LimitReader(originalReader, 10*1024*1024)

// Read from limitedReader instead of originalReader
data, err := io.ReadAll(limitedReader)

io.LimitReader acts like a safety valve for your data stream. It lets you read from a file or network connection but automatically stops after a specific number of bytes. This prevents your program from accidentally loading a massive file into memory and crashing.