I Built a Gmail AI Responder in Node.js (and it Actually Works)

I Built a Gmail AI Responder in Node.js (and It Actually Works) You know the situation. You have 30 unread emails. You’ve written a few replies. They technically work… but they feel clunky, too long, slightly awkward, or just off in tone. I wanted a way to fix that: Without switching tools Without copying emails into ChatGPT Without paying for another SaaS Without building a heavy UI So I built Gmail Responder , a tiny Node.js CLI that: Watches for a Gmail label Finds your draft reply Polishes it with GPT-4.1 Puts the improved version back into Gmail No UI. No dashboard. No browser extensions. Just a script you run when you're ready. Here’s how it works and how you can build your own. The Idea The workflow is intentionally dead simple: Write a rough draft reply in Gmail Add a label such as znote to the thread Run the script Reopen your draft and see the improved version The AI gets the full thread context, so it: Matches the tone of the conversation Keeps your intent intact Fixes gramm