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How HTTP POST requests work in Node ?

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The HTTP POST method is employed by the World Wide Web to send data to a server. This request method is characterized by the inclusion of data in the request body, and the type of this body is specified by the Content-Type header. Express.js, a web application framework for Node, facilitates the creation of servers and handling various HTTP requests, such as GET and POST.

Syntax:

app.post(route, function(req, res){
//this is a callback function
})

Steps to Create the Application:

Step 1: Initialising the Node App using the below command:

npm init -y

Step 2: Installing the required packages:

npm i express body-parser

Project Structure:

NodeProj

The updated dependencies in package.json file will look like:

"dependencies": {
"body-parser": "^1.20.2",
"express": "^4.18.2",
}

Example: Below is the basic example of the HTTP POST request using nodejs:

  • User accesses the server at http://localhost:3000/.
  • The server sends the HTML form for the user to input two numbers.
  • User enters numbers and submits the form.
  • The server receives the POST request, extracts the numbers, performs addition, and sends the result as a response.

Javascript

const express = require("express");
const bodyParser = require("body-parser")
 
// New app using express module
const app = express();
app.use(
    bodyParser.urlencoded({
        extended: true
    })
);
 
app.get("/",
    function (req, res) {
        res.sendFile(
            __dirname + "/index.html"
        );
    });
 
app.post("/",
    function (req, res) {
        var num1 =
            Number(req.body.num1);
        var num2 =
            Number(req.body.num2);
 
        var result = num1 + num2;
        res.send("Addition - " + result);
    });
 
app.listen(3000, function () {
    console.log(
        "server is running on port 3000"
    );
})

                    

HTML

<!DOCTYPE html>
<html lang="en" dir="ltr">
 
<head>
    <meta charset="utf-8">
    <title>Calculator</title>
</head>
 
<body>
    <h1>Simple Calculator.</h1>
    <form action="/" method="post">
        <input type="text" name="num1"
            placeholder="First Number">
        <input type="text" name="num2"
            placeholder="Second Number">
            
        <button type="submit" name="submit">
            calculator
        </button>
    </form>
</body>
 
</html>

                    

Output:

httppostGIF

Output





Last Updated : 18 Jan, 2024
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