How to fix npm ERR! code SIGTERM npm ERR! errno SIGTERM npm ERR! process terminated with SIGTERM in npm

# ❌ Before (bad - npm intercepts signals)
CMD npm start

# ✅ After (good - Node.js is PID 1)
CMD ["node", "./dist/index.js"]

# ❌ Before
web: npm start

# ✅ After
web: node ./dist/index.js

# ❌ Shell form (bad - signals lost in shell)
CMD "node ./src/index.js"

# ✅ Exec form (good - signals forwarded directly)
CMD ["node", "./src/index.js"]

// index.js - add at the very top
process.on('SIGTERM', () => {
  console.log('SIGTERM received, starting graceful shutdown...');

  server.close(() => {
    console.log('HTTP server closed');
    process.exit(0);
  });
});

process.on('SIGINT', () => {
  console.log('SIGINT received, shutting down...');
  process.exit(0);
});

const express = require('express');
const app = express();

const server = app.listen(3000, () => {
  console.log('Server running on port 3000');
});

docker run --init -p 3000:3000 my-node-app

FROM node:20-alpine
RUN apk add --no-cache tini
WORKDIR /app
COPY . .
RUN npm ci --omit=dev

ENTRYPOINT ["/sbin/tini", "--"]
CMD ["node", "./dist/index.js"]

services:
  app:
    build: .
    init: true
    ports:
      - "3000:3000"

# Locally, test with memory constraints:
node --max-old-space-size=256 ./dist/index.js

// ✅ Use streaming instead of loading entire datasets
app.get('/data', (req, res) => {
  fs.createReadStream('large-file.json').pipe(res);
});

// ❌ Avoid: loading entire file into memory
app.get('/data', (req, res) => {
  const data = fs.readFileSync('large-file.json');
  res.send(data);
});