Security is a critical part of modern web development.
JavaScript applications often handle user data, authentication, and sensitive information.
If security is ignored, even a small mistake can lead to serious problems like data theft or system damage.
Understanding JavaScript security helps developers build applications that are not only functional, but also safe and trustworthy.
Why JavaScript Security Matters
- Protects user data
- Prevents hacking and misuse
- Builds trust with users
- Keeps applications compliant with standards
- Avoids financial and legal risks
Security is not optional — it is a responsibility.
This code allows user input to be inserted directly into the page.
If a malicious user enters harmful code, it can run in the browser.
Using textContent prevents user input from being treated as HTML or script.
This simple change protects against common security risks.
These examples show how small security improvements can prevent big problems.
By learning JavaScript security from the beginning, students gain the mindset of responsible developers who build safe, reliable, and professional applications — an essential step toward becoming job-ready.