MessagePack (or "MsgPack") is a serialization format similar to JSON but binary. Unlike JSON but like TOML and YAML it distinguishes between byte arrays and strings and has a timestamp format (as an optional but standardized extension).
There are the following options for working with MessagePack in Tcl.
|Library||Type||Minimum Tcl version||MsgPack spec version||License||Features|
|https://github.com/jdc8/msgpack||pure Tcl||8.6||"new" (v5)||3-clause BSD||Encoder, decoder, extension formats, timestamp|
|https://github.com/jdc8/tclmsgpack||Critcl C extension||8.5||"old" (v4)||3-clause BSD||Encoder, decoder|
|https://github.com/tkob/tclmessagepack||pure Tcl||?||"new" (v5)||MIT||Decoder, extension formats|
|https://github.com/yuhangwang/MessagePack-Tcl||pure Tcl||8.5||"old" (v4)||MIT||Encoder, decoder, extension formats|