This guide will walk you through creating a chatbot using React for the frontend, Node.js for the backend, and OpenAI’s powerful language models.
Prerequisites
Ensure you have the following before you begin:
- Basic knowledge of JavaScript and experience with React and Node.js.
- Node.js installed on your machine.
- An account with OpenAI and access to their API.
Step 1: Using Node.js to Set Up Your Backend
Initialize Node.js project
Make a new project directory and launch a Node.js application:
Install dependencies
You’ll need “express” for creating the server and “axios” for making HTTP requests to the OpenAI API. You can replace “express” with server of your choice. Instead of “axios” you can use the built-in “fetch” for making HTTP requests
Set up Express server
Create a file named server.js and initialize an express app. The express app will be listening on PORT 5000.
Integrate OpenAI API
Add a route to handle POST requests from our React application that will interact with OpenAI. This POST request will contain user message in the body.
Step 2: Using React to Set Up Your Frontend
Initialize a Vite project
Create a new directory for your project and initialize a React application:
Build Chat Interface
Create a simple chat interface in your App component. We are using “messages” state to manage our array of chat messages. 
Implementing handleSendClick
We send an HTTP request to the express backend when a user types a message in the input field and clicks the send button. We will display the OpenAI message, or, in the event of an error, an error message based on the response.
Here is how we are monitoring the “loading” state:
The assistant message will be empty when the user clicks the send button while an HTTP request is still being processed.
Improve User Experience
Scrolling to the end of messages
To scroll to the end of messages when a user clicks on the send button, we will create an empty div element and attach a ref to it.
Now, when a user clicks on the send button, we will scroll to the anchor element.
Preventing scroll to bottom if user scrolls up after sending message
Create another ref to check whether anchor element is in viewport. If it’s not in viewport, that means user has scrolled up and hence we will not scroll down.
Add a scroll handler to div wrapping messages.
Conclusion
In this blog we discussed building a chatbot with React, Node.js, and OpenAI. Hope this step-by-step guide was helpful to you. Are you curious to know more about AI tools and technologies? Our next blog from this series will provide you with interesting and useful information by guiding on improving Flolite with an AI-Powered Chatbot. Click here to increase your knowledge and tech expertise.
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