Try It Yourself - SyntaxStudy Editor

HTML / CSS / JS

// server.js – production entry point
require('dotenv').config(); // no-op in prod if no .env file
const app  = require('./app');
const db   = require('./db');           // Sequelize/Mongoose instance
const PORT = process.env.PORT || 3000;

// ── Health check ──────────────────────────────────────────────
app.get('/health', async (req, res) => {
    try {
        await db.authenticate(); // verify DB connection
        res.json({ status: 'ok', uptime: process.uptime() });
    } catch (err) {
        res.status(503).json({ status: 'error', detail: err.message });
    }
});

// ── Start server ──────────────────────────────────────────────
const server = app.listen(PORT, () => {
    console.log(`Listening on port ${PORT} (${process.env.NODE_ENV})`);
});

// ── Graceful shutdown ─────────────────────────────────────────
async function shutdown(signal) {
    console.log(`${signal} received – shutting down gracefully`);
    server.close(async () => {
        await db.close();
        console.log('DB connection closed. Exiting.');
        process.exit(0);
    });
    // Force exit after 10 s if connections don't close
    setTimeout(() => process.exit(1), 10_000).unref();
}

process.on('SIGTERM', () => shutdown('SIGTERM'));
process.on('SIGINT',  () => shutdown('SIGINT'));