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    <p>Here is an example of a REST API web service that dynamically loads the handler js file based on the url sent to the server:</p> <p>server.js</p> <pre><code>var http = require("http"); var url = require("url"); function start(port, route) { function onRequest(request, response) { var pathname = url.parse(request.url).pathname; console.log("Server:OnRequest() Request for " + pathname + " received."); route(pathname, request, response); } http.createServer(onRequest).listen(port); console.log("Server:Start() Server has started."); } exports.start = start; </code></pre> <p>router.js</p> <pre><code>function route(pathname, req, res) { console.log("router:route() About to route a request for " + pathname); try { //dynamically load the js file base on the url path var handler = require("." + pathname); console.log("router:route() selected handler: " + handler); //make sure we got a correct instantiation of the module if (typeof handler["post"] === 'function') { //route to the right method in the module based on the HTTP action if(req.method.toLowerCase() == 'get') { handler["get"](req, res); } else if (req.method.toLowerCase() == 'post') { handler["post"](req, res); } else if (req.method.toLowerCase() == 'put') { handler["put"](req, res); } else if (req.method.toLowerCase() == 'delete') { handler["delete"](req, res); } console.log("router:route() routed successfully"); return; } } catch(err) { console.log("router:route() exception instantiating handler: " + err); } console.log("router:route() No request handler found for " + pathname); res.writeHead(404, {"Content-Type": "text/plain"}); res.write("404 Not found"); res.end(); } exports.route = route; </code></pre> <p>index.js</p> <pre><code>var server = require("./server"); var router = require("./router"); server.start(8080, router.route); </code></pre> <p>handlers in my case are in a subfolder /TrainerCentral, so the mapping works like this:</p> <p>localhost:8080/TrainerCentral/Recipe will map to js file /TrainerCentral/Recipe.js localhost:8080/TrainerCentral/Workout will map to js file /TrainerCentral/Workout.js</p> <p>here is a example handler that can handle each of the 4 main HTTP actions for retrieving, inserting, updating, and deleting data.</p> <p>/TrainerCentral/Workout.js</p> <pre><code>function respond(res, code, text) { res.writeHead(code, { "Content-Type": "text/plain" }); res.write(text); res.end(); } module.exports = { get: function(req, res) { console.log("Workout:get() starting"); respond(res, 200, "{ 'id': '123945', 'name': 'Upright Rows', 'weight':'125lbs' }"); }, post: function(request, res) { console.log("Workout:post() starting"); respond(res, 200, "inserted ok"); }, put: function(request, res) { console.log("Workout:put() starting"); respond(res, 200, "updated ok"); }, delete: function(request, res) { console.log("Workout:delete() starting"); respond(res, 200, "deleted ok"); } }; </code></pre> <p>start the server from command line with "node index.js"</p> <p>Have fun!</p>
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