Security can’t be an afterthought. A single vulnerability can compromise user data and your reputation. This guide covers the essentials every web developer should apply.
1. OWASP Top 10 Awareness
Familiarize yourself with the OWASP Top 10: broken access control, cryptographic failures, injection (SQL, NoSQL, command), insecure design, misconfiguration, vulnerable components, auth failures, data integrity failures, security logging failures, and SSRF. Prioritize injection and broken access control—they’re among the most common.
2. Authentication & Sessions
Use proven auth libraries (e.g. Passport, NextAuth) and never store plain-text passwords—always hash with bcrypt or Argon2. Use HTTPS only and secure, HttpOnly cookies for sessions. Implement rate limiting and account lockout to reduce brute-force risk.
3. Input Validation & Output Encoding
Validate and sanitize all input on the server. Use parameterized queries or ORMs to prevent SQL injection. Escape output for the context (HTML, URL, JavaScript) to prevent XSS. Consider a strict Content-Security-Policy header.
4. HTTPS and Headers
Enforce HTTPS and set security headers: Strict-Transport-Security, X-Content-Type-Options: nosniff, X-Frame-Options, and Content-Security-Policy. Keep dependencies and server configs updated.
5. Secrets and Environment
Never commit API keys or secrets. Use environment variables and secret managers. Rotate credentials periodically and limit access to production.
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