Helmet
Helmet is a Node.js middleware library for Express.js applications that helps secure web applications by setting various HTTP headers. It provides a simple way to protect against common web vulnerabilities, such as cross-site scripting (XSS), clickjacking, and other attacks, by configuring security-related headers automatically. Developers can use it to enhance the security posture of their Express-based web servers with minimal configuration.
Developers should use Helmet when building Express.js applications to improve security by mitigating common web threats without manually setting complex HTTP headers. It is particularly useful for production deployments, APIs, and any web service where security headers are critical for compliance or protection against attacks like XSS or content injection. Learning Helmet is recommended for Node.js developers focused on building secure, robust web applications.