A new plugin called "javascript" has been added to WeeChat. You can now load and execute Javascript scripts in WeeChat!

This plugin uses Google's v8 engine.

WeeChat now supports Python, Perl, Ruby, Lua, Tcl, Guile and Javascript!

To load/unload JS scripts, you can use the /script or /javascript command.

An example of script is available here: https://weechat.org/files/temp/scripts/example.js.