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event dispatch for express


An express.js utility for firing off named events that you expect to callback.

This is a slight change over an eventing system in that you expect a callback to be called, and you want control over the response; for example, firing off requests to either an API or stubbing local data based on configuration.

npm install express-transmit
var express = require('express'),
    expressTransmit = require('express-transmit'),
    app = express.createServer(),
    http = require('http');
app.eventRouter = expressTransmit(app);
// Provide an endpoint; external for prod, dummy data for development 
app.configure('production', function(){
  app.transmit.provide(':method/data/:collection/:id', function(params, data, callback){
    http.get('' +, function(res){
      var chunks = [];
      res.on('data', function(chunk){
      res.on('end', function(){
        callback(null, JSON.parse(chunks.join(''));
    }).on('error', function(error){
app.configure('development', function(){
  app.transmit.provide(':method/data/:collection/:id', function(params, data, callback){
    callback(null, { 
      id: 1,
      name: 'Jack' 
// Perform a request 
app.get('/api/users/1', function(req, res){
  app.transmit.request('get/data/users/1', function(params, data, function(err, data){
      res.json({ error: err.message });