What happens if my CSP is too strict?

If a CSP is too strict, legitimate scripts or styles may be blocked, causing parts of your website to fail. Always test your policy in a staging environment before deploying to production.

Can I use 'unsafe-inline' and still be secure?

While 'unsafe-inline' is common for ease of use, it significantly weakens XSS protection. The 'Strict' preset recommends moving all inline code to external files for maximum security.

Is a meta tag as effective as an HTTP header?

Most CSP features work identically in meta tags. However, certain directives like 'report-uri' or 'frame-ancestors' usually require the HTTP header to function correctly.

What is the 'default-src' directive for?

It serves as a fallback for other fetch directives. If a specific directive like 'script-src' is missing, the browser will use the value of 'default-src' instead.

Do I need CSP if I use a modern framework like React?

Yes. While frameworks help prevent many XSS patterns, CSP provides a critical secondary defense layer against vulnerabilities in third-party libraries or server-side injections.

How do I test my CSP without breaking the site?

You can use the 'Content-Security-Policy-Report-Only' header on your server. This logs violations to a reporting endpoint without actually blocking the resources.

CSP Generator

CSP Generator Overview

Generate Content Security Policy headers

The Content Security Policy (CSP) Generator is a critical security utility for modern web developers aimed at mitigating Cross-Site Scripting (XSS), clickjacking, and other code injection attacks. CSP is an added layer of security that helps detect and mitigate certain types of attacks, including XSS and data injection. These attacks are used for everything from data theft to site defacement and malware distribution. Our tool provides a tactical interface to define which dynamic resources are allowed to load on your site. By explicitly declaring approved sources for scripts, styles, images, and fonts, you can prevent the execution of malicious scripts even if an attacker finds a vulnerability in your code. The generator features three distinct security tiers: 'Strict' for maximum security (disallowing inline scripts), 'Standard' for a balanced production environment, and 'Lax' for development testing. It generates both the standard HTTP Response Header and the HTML Meta Tag equivalent. With real-time validation and clear descriptions for each directive (like default-src, script-src, and frame-ancestors), it demystifies complex security headers and makes robust web protection accessible to every developer.

How to Use CSP Generator

Select a security preset (Strict, Standard, or Lax) to get started quickly
Fine-tune individual directives by adding or removing sources like 'self', 'unsafe-inline', or specific domains
Observe the real-time preview of the resulting CSP string in the output terminal
Copy the 'HTTP Header' output to use in your server configuration (Nginx, Apache, or Node.js)
Alternatively, copy the 'Meta Tag' output to paste into your HTML section
Use browser developer tools to verify that the policy is active and not blocking legitimate resources

Frequently Asked Questions

What happens if my CSP is too strict?: If a CSP is too strict, legitimate scripts or styles may be blocked, causing parts of your website to fail. Always test your policy in a staging environment before deploying to production.
Can I use 'unsafe-inline' and still be secure?: While 'unsafe-inline' is common for ease of use, it significantly weakens XSS protection. The 'Strict' preset recommends moving all inline code to external files for maximum security.
Is a meta tag as effective as an HTTP header?: Most CSP features work identically in meta tags. However, certain directives like 'report-uri' or 'frame-ancestors' usually require the HTTP header to function correctly.
What is the 'default-src' directive for?: It serves as a fallback for other fetch directives. If a specific directive like 'script-src' is missing, the browser will use the value of 'default-src' instead.
Do I need CSP if I use a modern framework like React?: Yes. While frameworks help prevent many XSS patterns, CSP provides a critical secondary defense layer against vulnerabilities in third-party libraries or server-side injections.
How do I test my CSP without breaking the site?: You can use the 'Content-Security-Policy-Report-Only' header on your server. This logs violations to a reporting endpoint without actually blocking the resources.

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