A minimal ChatGPT client by vanilla javascript, run from local or any web host

This program aims to code a full functional chatGPT client using only raw HTML/CSS/JavaScript with minimal coding effort, in the purpose of exploring the minimum requirements of utilizing chatGPT features without the need for a server, framework, or additional resources.

This program offers basic conversation functions with some enhancements for conversation content

1. refined printout
2. easy to copy code-block and content
3. export conversation to markdown
4. voice recognition and speak answer

It is available as a single HTML file, which run directly from local or GitHub source folder.

• https://raw.githack.com/casualwriter/vanilla-chatgpt/main/source/index.html
• https://raw.githack.com/casualwriter/vanilla-chatgpt/main/source/vanilla-chatgpt.html
• if do not have API key, please check the demo

Source folder includes two version of vanilla-chatGPT with a javascript library for chatGPT API.

1. index.html is a single file version of vanilla-chatGPT. no dependence.
2. vanilla-chatgpt.html is the minimum version using casual-markdown.js and vanilla-chatgpt.js.
3. vanilla-chatgpt.js the js library reusable for your chatGPT client.

The program is quite simple in about 380/165 lines of code, making it easy to be revised in your purpose.

You can fork this repo to add your prompt library and further customization.

vanilla-chatgpt.js is the reusable code with the following functions:

• chat.stream(prompt) submit prompt in stream mode.
• chat.send(prompt) submit prompt in normal mode.
• chat.onmessage(text) will be triggered when message received.
• chat.oncomplete(text) will be triggered when message completed.
• chat.controller.abort() to abort fetch() process
• chat.export() to export conversation to markdown file
• chat.history[] keep the conversation history
• chat.apiKey stored the OPENAI_API_KEY, please assign it before call above functions.

When load the page first time, Program will prompt to input OPENAI_API_KEY which could be found in openai account page -> API Key

It is safe as the key will be stored in browser local storage by the following script

// prompt for API key if not found in localStorage
window.onload = function () {
  chat.apiKey = localStorage.getItem('OPENAI_API_KEY');
  if (!chat.apiKey || chat.apiKey.length < 10 ) {
     chat.apiKey = prompt("Please input Secret API key (will store in local.storage)", "sk-");
     localStorage.setItem('OPENAI_API_KEY', chat.apiKey)
  }
}

For next time loading the page, it will retrieve API key from local storage.

To remove the API key from local storage, just click on [logout] button.

If feel not convenience to input the key every time, you may can hard-code the API key as below

window.onload = function () {
  chat.apiKey = 'sk-???????????';
}  

Please be aware that if you hard-code the key in HTML, it may become vulnerable to being revealed. It's recommended run the program on a local or private network.

Inspired by the some self-host solutions

• https://github.com/yuezk/chatgpt-mirror, mirror of ChatGPT (node.js, self-host)
• https://github.com/dirk1983/chatgpt, a simple self-host solution (php)

Special thanks for jat23606, he inspired and contributed the code for voice recognition and speak feature.

• https://github.com/jay23606/chat-gpt-voice

• 2023/03/29, v0.65, initial version
• 2023/04/12, v0.70, add voice recognition and speak, and some minor refinement