Besides setting a maximum request limit, there may be situations where we would like to slow down response such that it sends a chunk every x milliseconds. This can be useful when testing slow connections.

Usually, you will want to limit file uploads because it wouldn't be relevant to throttle a JSON response of 20 KB.

There are several NPM modules that do throttling, such as slow-stream and throttle. Let's say we have a file attached to a note and want to send a 64-byte chunk at a time, each 100 milliseconds, using slow-stream, as follows:

streamFromDatabaseOrFileSystem('note-attachment-asdAsd21j3o8uad', { bufferSize: 64 })
  .pipe(new SlowStream({ maxWriteInterval: 400 }))
  .pipe(res);

Both the modules mentioned work with streams, as you can see from the preceding example. The slow-stream module can also handle back pressure, so if we're dealing with a proper implemented stream, we won't have memory leaks.