“Hi everyone! I hope you’re doing great. My name is Julian, and in today’s session, we’re going to understand three important HTTP methods: POST, PUT, and DELETE. These methods are essential for building a fully functional web application. Let’s dive right in!”
Explaining express.json() Middleware: (Explain this in between post request after showing that it is printing undefined)
“Before we get started with the HTTP methods,
let’s quickly understand the use of express.json() middleware.
In web applications, we often send data to the server and format that we use is JSON format. For example,
when you fill out a form on a website,
the data is usually converted into JSON before being sent to the server.
The express.json() middleware helps us parse this incoming JSON data,
making it accessible as req.body in our code.
Without this middleware, the server won’t understand the incoming JSON data.
Here’s how we use it in an Express app:
const express = require(‘express’);
const app = express();
// Middleware to parse JSON
app.use(express.json());
By adding app.use(express.json()), we ensure that all incoming JSON data is automatically parsed for our use. Now, let’s move on to the requests.”
Explaining POST Request:
First, let’s talk about the POST request.
A POST request sends data to the server to create a new resource.
Think of it as filling out a form and submitting it to save your information.
Here’s an example:
When you sign up for a website, your details like name and email are sent to the server using a POST request.
In code, a POST request might look like this:
app.post(‘/users’, (req, res) => {
const newUser = req.body; // Extract data from the request
res.status(201).send({ message: ‘User created successfully’, user: newUser });
});
The key here is that POST creates something new.”
Explaining PUT Request
“Next, we have the PUT request.
A PUT request is used to update an existing resource on the server.
For example, if you want to update your profile details, a PUT request is used to send the updated data to the server.
Here’s an example:
app.put(‘/users/:id’, (req, res) => {
const userId = req.params.id; // Get the user ID from the URL
const updatedData = req.body; // Get updated data from the request
// Update user in the database
res.send({ message: ‘User updated successfully’, userId, updatedData });
});
The PUT method replaces the resource with the new data.”
Explaining DELETE Request:
“Finally, let’s discuss the DELETE request.
As the name suggests, DELETE removes a resource from the server.
For instance, when you delete a user account,
the DELETE request removes the corresponding data from the database.
Here’s an example:
app.delete(‘/users/:id’, (req, res) => {
const userId = req.params.id; // Get the user ID from the URL
// Remove user from the database
res.send({ message: ‘User deleted successfully’, userId });
});
The DELETE method ensures the resource is no longer available.”
Summary
“So, to summarize:
POST is for creating a new resource.
PUT is for updating an existing resource.
DELETE is for removing a resource.
Practice these methods to understand how they work in real-world scenarios. That’s all for today’s session. Thank you for watching, and see you in the next video!”
