Securing File Uploads: The First Line of Defense in Chat Applications

File upload vulnerabilities are among the most exploited security gaps in web applications, yet many developers overlook them when building chat features. This article demonstrates how simple validation techniques—whitelisting file types, sanitizing filenames, and organizing storage properly—can effectively prevent malicious file uploads from compromising your application. Understanding these practices is essential for anyone building real-world systems where user-generated content is involved.