Web applications are one of the most sensitive targets of cyber attacks in our time.
It is crucial to keep your web applications secure against emerging threats in order to protect sensitive user information, preserve trust, and stay up to standard with industry regulations.
We will find out what works best in the article, which is the best practices for every developer or development team to adopt to keep their apps secure in 2025.
1. Implement Strong Authentication and Authorization
Your Login is the first point of security. Implement multi-factor authentication (MFA) which adds an extra layer behind passwords. Also don’t forget about proper authorization checks to ensure that users only see what they are allowed to see.
See more JavaScript security tips for ways to improve authentication in your applications.
2. HTTPS Everywhere
If you are encrypting data in transit, you are headed in the right direction. Use HTTPS on your entire site. Obtain SSL/TLS certificates, and there are free SSL/TLS certificates from Let’s Encrypt. Using HTTPS protects from data being intercepted from attackers and can protect against man-in-the-middle attacks.
Check out our step-by-step tutorial on how to enable HTTPS for your website.
3. Sanitize User Inputs to Prevent Injection Attacks
Injection attacks, which include types of injection such as SQL injection and Cross-Site Scripting (XSS), are the most harmful of any of the previously mentioned attacks.
- Software and Dependencies Update
Outdated (including legacy) software, frameworks, and libraries are almost always vulnerable. Update your server software and dependencies over time to patch security issues.
Learn secure coding practices from our secure coding guides to ensure that the codebase remains healthy.
- Content Security Policy (CSP)
Implementing a solid Content Security Policy (CSP) limits what resources can be loaded on your website, therefore, preventing XSS attacks. Implementing good CSP headers allows you to load only trusted scripts and styles.
Check out this tutorial by the Mozilla Developer Network about implementing CSP headers.
- Security Headers
Other HTTP security headers including X-Frame-Options, X-Content-Type-Options, and Strict-Transport-Security help defend against clickjacking, MIME sniffing, and protocol downgrade attacks.
Check out MDN Web Docs to learn more about web security headers.
- Security Event Monitoring and Logging
Keep robust records of user activity and system activity – by monitoring automated logs, you can spot suspicious activity or security threats sooner and respond quicker. - Regular Security Testing
Regular pen tests and use of vulnerability scanning tools (OWASP ZAP, Burp Suite) to find vulnerabilities before attackers do.
Google’s Web Fundamentals Security section can walk you through how to secure web apps by
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