xavieluh/ai-writing-assistant-mern ? reverse-engineered prompt

Build me a simple AI writing assistant web app where I can paste or type text, then get quick help fixing grammar, spelling, or rewriting a sentence in a better way.

I want one clean editor page with a few action buttons for those three tasks, plus a side area that shows the suggestions and lets me keep the ones I like in a running list. Make it feel like a real writing helper, not a chat app. Add a basic login screen and navigation too, but it does not need full account storage or document saving yet.

Use React for the front end and a small Express API for the text fixes, powered by OpenAI. Keep everything working end to end, make sure the browser can actually talk to the server, and handle errors nicely if a request fails. If you need to check current docs for the best setup, go ahead and look them up online.