Express Post Request

In Express.js, handling HTTP POST requests is common when dealing with forms and data submissions.

To handle POST requests in Express.js, we need to use the `post()` method to define a route that listens for POST requests. The data sent from the client to server can be accessed from the request body using `req.body`.

Declaring express module:

const express = require("express");
const app = express();

Declaring Middleware for request handlers:

// Middleware to parse JSON and URL-encoded data
app.use(express.json({ limit: "50mb" }));
app.use(express.urlencoded({ extended: true, parameterLimit: 50000 }));
const PORT = process.env.PORT || 3000;

Define request handler:

// Simulating a data store
let users = [
  { id: 1, name: 'Alice Collin' },
  { id: 2, name: 'Edward Collin' },
];

// Handling a simple GET request at the root URL "/" to fetch all users
app.get("/", (req, res) => {
  console.log("recieve request");
  res.send(JSON.stringify(users));
});

// Handling a POST request with form data
app.post("/add-user", (req, res) => {
  const formData = req.body;
  users.push(formData);
  res.send(`Form Data Received: ${JSON.stringify(formData)}`);
});

Start Listening server on specific PORT:

// Listening on the 3000 port
app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});

Handling POST request in Express:

const express = require("express");
const app = express();

// Middleware to parse JSON and URL-encoded data
app.use(express.json({ limit: "50mb" }));
app.use(express.urlencoded({ extended: true, parameterLimit: 50000 }));
const PORT = process.env.PORT || 3000;

// Simulating a data store
let users = [
  { id: 1, name: 'Alice Collin' },
  { id: 2, name: 'Edward Collin' },
];

// Handling a simple GET request at the root URL "/" to fetch all users
app.get("/", (req, res) => {
  console.log("recieve request");
  res.send(JSON.stringify(users));
});

// Handling a POST request with form data
app.post("/add-user", (req, res) => {
  const formData = req.body;
  users.push(formData);
  res.send(`Form Data Received: ${JSON.stringify(formData)}`);
});

// Listening on the 3000 port
app.listen(PORT, () => {

  console.log(`Server is running on http://localhost:${PORT}`);

});

"app.post()" is used to define a route for handling HTTP POST requests.

The "express.json()", "express.urlencoded({extended: true})" middleware is used to parse the request body, making it accessible through "req.body".

The req (request) object provides information about the incoming request, and the res (response) object is used to send a response back to the client.

Scenarios covered in the example:

Handling a get request at the root URL ("/") to fetch all mock users.
Handling a POST request with form data ("/submit"). The express.json(), express.urlencoded({extended: true}) middleware is used to parse the form data from the request body.

Start Server Command:

 // navigate to folder location where server.js exist

node server.js

<-- Get Request

Put Request -->