nbb, an ad-hoc scripting tool for Node.js, v0.0.101 comes with a basic console REPL and socket server REPL (only 49 lines of code!):

$ npm install -g nbb
$ nbb
user> (+ 1 2 3)
6
user> (ns foo (:require ["fs" :as fs]))
#object[Pn foo]
foo> (fs/existsSync "README.md")
true

$ nbb socket-repl :port 1337