Export your ChatGPT conversations as Github Gists
Features full markdown support!
Just copy the contents of bookmarklet.js into a bookmark in your browser.
I wanted the authentication flow to be entirely client-side, but Github's OAuth API does not set CORS allow-origin header. Therefore, I had to make a small backend that would proxy requests to the Github API without running into CORS issues.
(Bonus Markdown chessboard -- how cool is that?)
Enjoy!