Helmet CSP

Helmet CSP is a middleware for Node.js applications that helps implement Content Security Policy (CSP) headers to mitigate cross-site scripting (XSS) and other code injection attacks. It allows developers to define which sources of content are trusted and can be executed or loaded by the browser, such as scripts, styles, images, and fonts. This library is part of the larger Helmet.js security suite, which provides various HTTP header protections for Express.js and other Node.js frameworks.

Also known as: Helmet Content Security Policy, Helmet.js CSP, Helmet-csp, CSP middleware, Content-Security-Policy

Why learn Helmet CSP?

Developers should use Helmet CSP when building web applications with Node.js, especially those handling user input or sensitive data, to enhance security against XSS attacks. It is crucial for compliance with security standards and best practices in production environments, such as e-commerce sites, banking apps, or any service where data integrity is paramount. By configuring CSP policies, developers can restrict unauthorized script execution, reducing the risk of malicious code injection.

Learning Resources

• docs: Helmet.js Documentation - CSP
• docs: MDN Web Docs - Content Security Policy (CSP)
• tutorial: Node.js Security Best Practices with Helmet
• tutorial: Express.js Security: Implementing CSP with Helmet
• video: YouTube - Helmet.js Tutorial for Beginners