When you need to create new resources or update existing ones from your React application, Axios makes it easy to send data to your backend API. To illustrate, imagine you have a simple form where users can submit their name and email. When the form is submitted, you want to send this information as JSON to your server. In your React component, you might write a form submission handler like this:

import React, { useState } from "react";
import axios from "axios";

function SignupForm() {
  const [name, setName] = useState("");
  const [email, setEmail] = useState("");

  const handleSubmit = async (event) => {
    event.preventDefault();
    try {
      await axios.post("https://api.example.com/users", {
        name: name,
        email: email
      });
      alert("User created!");
    } catch (error) {
      alert("There was an error creating the user.");
    }
  };

  return (
    <form onSubmit={handleSubmit}>
      <input
        value={name}
        onChange={e => setName(e.target.value)}
        placeholder="Name"
      />
      <input
        value={email}
        onChange={e => setEmail(e.target.value)}
        placeholder="Email"
      />
      <button type="submit">Sign Up</button>
    </form>
  );
}

Here, the axios.post method sends a POST request to the API endpoint with the user data as a JSON object. This is a common pattern when submitting forms in React and sending data to your server.

Besides creating resources, you often need to update or delete them. Axios provides convenient methods for these operations: put for updating resources and delete for removing them.

A PUT request is typically used when you want to replace an existing resource with new data. For example, if your app allows users to update their profile, you might use axios.put to send the updated information to the server. The main difference between POST and PUT is that POST usually creates a new resource, while PUT replaces an existing one at a specific URL.

A DELETE request is used to remove a resource from the server. With Axios, you can use axios.delete and provide the URL of the resource you want to remove. Unlike POST and PUT, DELETE requests usually do not include a request body.

In summary:

• Use POST to create new resources, often sending form data as JSON;
• Use PUT to update or replace an existing resource, sending the full updated data;
• Use DELETE to remove a resource, specifying its unique identifier in the URL.

These methods let your React app interact with your backend to create, update, and delete data as needed.