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What are some common security best practices in Node.js applications?

Q: What are some common security best practices in Node.js applications?

**TL;DR.** Defense in depth: **validate all input**, use **parameterized queries**, **hash passwords** (bcrypt/argon2), set **security headers** (Helmet), enforce **HTTPS/TLS**, keep **secrets in env/vaults**, **rate-limit**, **audit dependencies** ( npm audit ), and never leak stack traces. No single control is enough. transport: HTTPS/TLS + headers (Helmet) edge: rate limit + authn/authz app core <text class='d-sub' x='230' y='114' text-anchor='

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A few high-impact defaults

import helmet from 'helmet';
app.use(helmet());                          // security headers
app.use(express.json({ limit: '100kb' }));  // cap body size (DoS)

// parameterized query — no string interpolation
await db.query('SELECT * FROM users WHERE email=$1', [email]);

// never leak internals in prod:
app.use((err, req, res, next) => res.status(500).json({ error: 'Internal error' }));

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