Start Node Server
Download node, create a new nodejs project and install express, bodyparser.
Express JS server
const express = require('express') const bodyParser = require('body-parser') const app = express() app.use(bodyParser.json()) app.get('/addfive/:int', (req,res)=> { const integer = req.params.int res.send(\`Sum:::${parseInt(integer) + 5}\`) }) app.listen(5000, () => console.log(\`App Running on port 5000 ::::\`))
Create A Express Application
Import Express and create a new express application:
//Import Express const express = require('express'); //Create Express App const app = express();
Body Parser
Body parser is a package that parses incoming request stream and makes in available under the req.body property.
//Import body-parser const bodyParser = require('body-parser'); //Use body-parser middleware app.use(bodyParser.json()); // parse application/json
It is important to note that body parser middleware should be used before the actual route handlers.
Route Handler
app.get('/addfive/:int', (req,res)=> { const integer = req.params.int res.send(\`Sum:::${parseInt(integer) + 5}\`) });
I have defined a simple route handler which will handle GET request at “{base_url}/addfive/{integer_user_input}” .
Every time a request is made, integer 5 is added to the incoming user input (integer that will come after /addfive/ , example: /addfive/5 will return 10 as sum) and output is set as response in JSON format.
Running The Application
app.listen(5000, () => console.log(\`App Running on port 5000 ::::\`))
This is how we run an express application on a specific port.
XRequest
XRequest will allow user to make requests to the express application from the console.
<Resource xmlns="http://xml.metamug.net/resource/1.0" v="1.0"> <Request method="GET"> <XRequest id="1" url="http://localhost:5000/addfive/14" method="GET" output="true"> </XRequest> </Request> </Resource>
The above XML resource represents a sample XRequest from console to the node application running on port 5000. We specify output=”true” to see the output in JSON format.
Output
{ "1": { "sum": 19 } }
Refer XRequest Documentatation for more information.