Creating ChatGPT Apps with JavaScript: A Hands-on Guide for AI Applications with OpenAI APIs

What can a JavaScript application do with OpenAI’s models? Bruce Hopkins Jr. and Bruce Hopkins Sr. answer with a sequence of hands-on projects that turn API concepts into working software. This guide moves from a first ChatGPT client to tools for summarizing Slack messages, transcribing audio, generating images, and building more capable Discord bots.

Rather than treating AI as a single feature, the authors show how different capabilities can serve different tasks—and how prompts, API calls, and application logic fit together. The result is a practical tour of AI application development with JavaScript.

Start with the APIs, then build

The opening chapters introduce ChatGPT for JavaScript developers, explain key API concepts, and walk through setup and authentication. Readers then create a basic client and explore using ChatGPT as a pair-programmer, with projects involving weather information and travel-time estimates.

Put AI to work in everyday tools

A Slack summarizer demonstrates how prompt engineering can shape concise, audience-aware summaries and suggested next steps. Later, a podcast-visualization project combines Whisper transcription with DALL·E 3 image generation, offering a concrete example of multimodal features working together.

Build and refine Discord bots

The book develops Discord bots for questions and content moderation, then returns to improve their intelligence and behavior. These chapters offer a useful view of how an AI model can be integrated into a larger application rather than used as a standalone chat interface.

For JavaScript developers exploring AI

With a project-led approach and coverage ranging from API fundamentals to Slack and Discord integrations, this book is suited to JavaScript developers and hobbyists interested in building AI-enabled applications. It also introduces prompt-engineering practices along the way, helping readers think about how instructions influence an application’s responses.

If you want to move from experimenting with AI to wiring model capabilities into JavaScript projects, this guide provides a hands-on path through several distinct kinds of application.