express-sample.cljs

(ns express_sample
  (:require [cljs.nodejs :as node]))

(def express (node/require "express"))
(def app (. express (createServer)))

(defn -main [& args]
  (doto app
    (.use (. express (logger)))
    (.get "/" (fn [req res]
                (.send res "Hello World")))
    (.listen 3000))
  (println (str "Express server started on port: "
                (.port (. app (address))))))

(set! *main-cli-fn* -main)

express-sample.js

// from http://blog.nodeknockout.com

var express = require('express'),app = express.createServer()

app.use(express.logger())

app.get('/', function(req, res){
    res.send('Hello World')
})

app.listen(3000)
console.log('Express server started on port %s', app.address().port)

helloserver.cljs

(ns helloserver
  (:require [cljs.nodejs :as nodejs]))

(def http (nodejs/require "http"))

(defn greetHandler [req res]
  (doto res
    (.writeHead 200 {"Content-Type" "text/plain"})
    (.end "Hello World")))

(defn server [handler port url]
  (-> (.createServer http handler)
      (.listen port url)))

(defn -main [& mess]
  (server greetHandler 1337 "127.0.0.1")
  (println "Server running at http://127.0.0.1:1337/"))

(set! *main-cli-fn* -main)

helloserver.js

var http = require('http')

function greetHandler (req,res) {
  res.writeHead (200,{'Content-Type': 'text/plain'})
  res.end('Hello World\n')
}

function server (handler,port,url) {
  http.createServer(handler).listen(port,url)
}

server (greetHandler,1337, "127.0.0.1")
console.log('Server running at http://127.0.0.1:1337/')