Security best practices are habits that professional developers follow to keep applications safe from attacks.
Instead of fixing security problems after they happen, good developers prevent them by writing secure code from the beginning.
By following these practices, students can build JavaScript applications that are reliable, trustworthy, and ready for real-world use.
Key Security Best Practices
- Never trust user input
- Avoid using innerHTML with dynamic data
- Store sensitive data on the server, not in the browser
- Use strong validation for forms
- Keep dependencies updated
- Limit user permissions
- Handle errors safely
- Follow the principle of least privilege
Security is a habit, not a one-time task.
This code allows any content to be injected into the page.
If the user enters malicious code, it can run in the browser.
Using textContent ensures that user input is treated only as text.
This simple practice blocks many common attacks like XSS.
These examples show how following security best practices prevents many common problems.
By developing secure coding habits, students gain the mindset of professional developers who protect users, data, and systems — a critical skill for becoming a job-ready JavaScript developer.