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Build a ChatGPT-Like App with JavaScript, React & OpenAI
Rating: 4.4 out of 5(4 ratings)
246 students

Build a ChatGPT-Like App with JavaScript, React & OpenAI

Step-by-step tutorial to connect your web app with the OpenAI API and create your own ChatGPT-style chatbot using React
Created byStephan Haewß
Last updated 10/2025
English
English [Auto],

What you'll learn

  • Creating web applications that incorporate AI chats
  • Usage of the OpenAI (ChatGPT) chat completion API
  • Create a basic chat application like ChatGPT
  • Render a simple chat app with React

Course content

2 sections • 12 lectures • 58m total length

  • What's the course about?2:18

    Learn to build ai chat applications using JavaScript, React, Astro JS, and the OpenAI API by creating three web apps, including a simple ChatGPT clone.

  • Tools used in this course4:04

    Explore the tools, libraries, and frameworks used in this course—JavaScript, Node.js, Astro JS, and React—along with npm and the OpenAI API, focusing on working with a large language model.

  • The OpenAI platform5:53

    Discover the OpenAI platform behind ChatGPT, learn how a large language model completes text from full context, and explore api calls, the playground, and docs with signup and api keys.

  • Important: Recent changes to the OpenAI API (and AstroJS)1:22

Requirements

  • Good knowledge of JavaScript (ES6) programming
  • Basic understanding of React JS programming
  • NodeJS is not required, but is an advantage

Description

Do you want to create your first AI-powered web app?
In this free mini-course, you’ll learn how to build your own ChatGPT-style chatbot using JavaScript, React, Astro, and the OpenAI API — step by step.

Whether you’re a web developer, indie maker, or simply curious about how AI works behind the scenes, this hands-on course gives you a practical, fast-paced introduction to building AI-powered applications. You’ll discover how modern AI tools can enhance your coding workflow and bring creative ideas to life — from chatbots to personal assistants and beyond.

What You’ll Learn

  • Set up an Astro + React project from scratch

  • Connect your app to the OpenAI API and send chat prompts

  • Handle conversation state and display messages dynamically

  • Design a clean and modern chat interface

What You’ll Build

A fully functional AI Chat Application — your own lightweight version of ChatGPT that runs directly in the browser and uses the OpenAI API to generate chat messages.

By the end of this mini-course, you’ll understand the fundamentals of connecting web applications with AI models and will be ready to expand your project with more advanced features later on. You’ll gain the confidence to explore creative AI integrations in your own projects and turn simple web apps into interactive, intelligent tools.

Who this course is for:

  • Web Developers that want to integrate AI into their web applications and games

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