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nodejs program that outputs piped in timestamped lines in chunks separated by a set time interval


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line2Chunk - nodejs program to serve line-by-line input into chunks


line2Chunk is a command line nodejs program that collects timestamped lines from its input stream into chunks of a regular timeSpan (generally) larger than the time difference between the lines which are sent to a websocket. The timeSpan is a millisecond value sent from the client web page (defaults to 1 sec). Timestamps from the input stream are assumed to be the first field of each line. The timeSpan can be changed by the consuming web client.

line2Chunk was written as a way to provide piped pping output to a web client visualizer but can be used to "chunk" any line-by-line output stream with a first field timestamp where the chunks cover some time span specified by the client.


line2Chunk requires nodejs ( and the packages 'ws' and 'websocket-stream'.

pping -i interface -m | node.js line2Chunk.js OR cat [some file of ppings] | node.js line2Chunk.js

then either "open index.html" from command line or navigate to index.html from localhost web page. (This can be used with ppvizCLI.html from Pollere's in-progress ppviz project for the adventurous.)

Note that the input to this file doesn't have to be ppings, just any source of lines with a first field of time in seconds.
A simple test can be peformed by executing the command line:

cat tst.pp | node line2Chunk.js

And then open index.html in a browser window. The browser window will display and scroll the output lines. index.html can be used with pping to view its output in a browswer window and can also be used as a template for more sophisticated client viewers.


See Also

pping at ppviz at


Kathleen Nichols


Copyright (c) 2018, Kathleen Nichols

Licensed under the GNU GPLv3. See LICENSE for more details.


nodejs program that outputs piped in timestamped lines in chunks separated by a set time interval







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