AI Text Summarizer App

A simple Node.js + Express app with a clean UI for summarizing long text via OpenAI. It serves a static frontend from public and exposes POST /api/summarize.

Local Development

1. Install dependencies:

npm install

2. Set your OpenAI API key (optional for preview mode):

# Windows PowerShell
$env:OPENAI_API_KEY="sk-..."
# macOS/Linux
export OPENAI_API_KEY="sk-..."

3. Run the server:

npm run dev

Open http://localhost:3000.

Without an API key, the app returns a truncated preview summary.

Deployment

Environment variables:

• OPENAI_API_KEY – required for real summaries
• PORT – optional; defaults to 3000

Render

• New Web Service → Connect repo
• Build Command: npm install
• Start Command: npm start
• Add env var OPENAI_API_KEY

Railway / Fly.io / Heroku

• Set OPENAI_API_KEY in project variables
• Start command: npm start

Vercel

• Use a Node serverless function or deploy as a Node server:
  • Framework preset: “Other”
  • Build Command: npm install
  • Output: N/A (server app)
  • Add OPENAI_API_KEY

API

POST /api/summarize

• body: { "text": string } (min 200 chars)
• response: { "summary": string }

Project Structure

• index.js – Express server and /api/summarize
• public/ – static frontend (index.html, stylesheet.css, script.js)

Notes

• Client adds loading state, validation, copy/clear, and character counter.
• The server limits JSON size to 1MB. Increase if needed.