I Built an AI Writing Assistant in a Weekend How I built a tool that helps me write 10x faster — and how you can too. The Problem I write a lot. Blog posts, documentation, client emails, proposals. The problem isn't what to write — it's getting started and staying consistent: Blank page paralysis Inconsistent tone across documents Spending 30 minutes on an email that should take 3 Forgetting key points mid-draft What I Built A simple web app that: Takes a topic/outline → generates a draft Takes my rough notes → polishes into clean prose Takes a finished piece → checks for consistency Maintains my writing style across all output Tech stack: Node.js + Express + OpenAI API (could use any LLM) The Architecture Browser (textarea) ↓ POST /api/write Express Server ↓ [Pre-processor] Clean input, extract intent ↓ [Prompt Builder] Assemble context-aware prompt ↓ [LLM Client] Call OpenAI/Claude/Gemini API ↓ [Post-processor] Format output, add metadata ↓ Response: { text, tokensUsed, suggestions } Enter fullscreen mode…