Node.js NodeJs Routing Express Web Server Routing
Example
Creating Express Web Server
Express server came handy and it deeps through many user and community. It is getting popular.
Lets create a Express Server. For Package Management and Flexibility for Dependency We will use NPM(Node Package Manager).
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Go to the Project directory and create package.json file. package.json { "name": "expressRouter", "version": "0.0.1", "scripts": { "start": "node Server.js" }, "dependencies": { "express": "^4.12.3" } }
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Save the file and install the express dependency using following command npm install. This will create node_modules in you project directory along with required dependency.
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Let's create Express Web Server. Go to the Project directory and create server.js file. server.js
var express = require("express"); var app = express();
//Creating Router() object
var router = express.Router();
// Provide all routes here, this is for Home page.
router.get("/",function(req,res){
res.json({"message" : "Hello World"});
});
app.use("/api",router);
// Listen to this Port
app.listen(3000,function(){ console.log("Live at Port 3000"); });
For more detail on setting node server you can see [here][1].
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Run the server by typing following command.
node server.js
If Server runs successfully, you will se something like this.
. -
Now go to the browser or postman and made a request
The output will be
.
That is all, the basic of Express routing.
Now let's handle the GET,POST etc.
Change yous server.js file like
var express = require("express");
var app = express();
//Creating Router() object
var router = express.Router();
// Router middleware, mentioned it before defining routes.
router.use(function(req,res,next) {
console.log("/" + req.method);
next();
});
// Provide all routes here, this is for Home page.
router.get("/",function(req,res){
res.json({"message" : "Hello World"});
});
app.use("/api",router);
app.listen(3000,function(){
console.log("Live at Port 3000");
});
Now if you restart the server and made the request to
http://localhost:3000/api/
You Will see something like 
Accessing Parameter in Routing
You can access the parameter from url also, Like http://example.com/api/:name/. So name parameter can be access. Add the following code into your server.js
router.get("/user/:id",function(req,res){
res.json({"message" : "Hello "+req.params.id});
});
Now restart server and go to [http://localhost:3000/api/user/Adem][4], the output will be like 
.
