MsgPacker: JSON ⬌ MessagePack

a rubygem which converts a JSON stream to MessagePack-ed one and vice versa. It contains an excutable script that reads STDIN and writes the converted stream to STDOUT.

Install this gem

gem install msgpacker

Then you now have a executable script named msgpacker.

Prepare a sample JSON file

$ echo '{"compact": true, "schema": 0}' > DATA.json 

And then execute the following to make it as MessagePack

$ cat DATA.json | msgpacker > DATA.mpac

Finally, you might also want to decode the MsgPack-ed file

$ cat DATA.mpac | msgpacker -d -n > DATA_decoded.json

If you give the -n option, it prints decoded json items with newline(\n) character appended.