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ChatGPT is a state-of-the-art language model that can generate human-like responses to a given prompt. It is based on a transformer architecture and has been trained on a large corpus of text, making it capable of generating high-quality responses to a wide range of inputs. With ChatGPT, developers can create chatbots that can engage in more natural and sophisticated conversations with users.

To use ChatGPT in a React.js application, you can follow these steps:

1. Create an account and obtain an API key from OpenAI’s website.
2. Install the openai package in your React.js application using the npm or yarn package manager.
3. Import the openai package in your React.js component where you want to use ChatGPT.
4. Call the openai.Completion function to generate a response from the ChatGPT model.

Here is an example React.js component that uses ChatGPT to generate a response to a user’s input:

import React, { useState } from 'react';
import openai from 'openai';

const API_KEY = 'YOUR_API_KEY';

const Chatbot = () => {
  const [input, setInput] = useState('');
  const [response, setResponse] = useState('');

  const handleInputChange = (event) => {
    setInput(event.target.value);
  };

  const handleFormSubmit = async (event) => {
    event.preventDefault();

    const prompt = `User: ${input}\nChatbot:`;
    const response = await openai.Completion.create({
      engine: 'davinci',
      prompt,
      maxTokens: 150,
      n: 1,
      stop: '\n',
    });

    const { choices } = response.data;
    const { text } = choices[0];

    setResponse(text);
    setInput('');
  };

  return (
    <div>
      <form onSubmit={handleFormSubmit}>
        <input type="text" value={input} onChange={handleInputChange} />
        <button type="submit">Send</button>
      </form>
      <p>{response}</p>
    </div>
  );
};

export default Chatbot;