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Generate Content Security Policy

Build a robust defense against client-side attacks. Generate a custom Content Security Policy (CSP) header mapped to your trusted domains.

Use this guide to understand the issue, validate the problem manually, and run the live scanner when you are ready. Get results in under 30 seconds.

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Why teams search for this check

Search intent around this topic usually comes from one of three pressures: a buyer or procurement questionnaire, a legal or compliance review, or an engineering team trying to validate a risky browser behavior before launch.

This page is written to answer that intent directly, without generic filler. It explains what the issue means technically, how to confirm it manually, and what a defensible fix looks like in production.

Why you need a Content Security Policy

A Content Security Policy (CSP) is a foundational HTTP response header that serves as a whitelist for the resources the browser is permitted to load on a specific page.

Instead of blindly trusting that all scripts and styles are safe, a CSP strictly tells the browser, 'Only execute JavaScript that originates from these specific, trusted domains.' If an attacker manages to inject malicious code into a forum comment or via a compromised third-party widget, the browser will refuse to run it because the attacker's domain is not on the whitelist.

Building a strict CSP is the single most effective way to eliminate Cross-Site Scripting (XSS) vulnerabilities, a class of attacks that consistently ranks in the OWASP Top 10 web security risks. In practice, teams usually do not lose trust because of a single configuration detail. They lose trust when the issue suggests weak governance, undocumented vendors, avoidable data sharing, or a disconnect between legal claims and live technical behavior.

What this tool specifically detects

  • Whether your current asset model needs a restrictive Content-Security-Policy rather than open-ended script loading.
  • The resource categories that usually need explicit allowlisting, including scripts, styles, fonts, frames, and connections.
  • Common CSP design mistakes such as relying on unsafe-inline or allowing broad wildcard sources.

When this becomes critical

  • You process forms, account actions, payments, or embedded third-party content.
  • You need demonstrable XSS mitigation for customer trust or procurement reviews.
  • Your application is growing and script governance is becoming harder to manage manually.

How this check works

Our free interactive builder helps you generate a Content Security Policy by allowing you to define your permitted sources for scripts, styles, images, frames, and fonts, instantly generating the correct HTTP header syntax to copy and paste.

The goal is not to create noise. The goal is to surface the signal that matters first, show you how the issue normally appears in production, and help you decide whether you need a quick fix, a deeper audit, or a broader policy update.

Real-world examples that trigger this finding

A marketing widget injects inline JavaScript, so the team keeps unsafe-inline permanently and weakens the policy.

An analytics change adds a new connect-src endpoint and silently breaks data collection in production.

A site uses third-party checkout or chat tools without modeling their frame-src or script-src requirements.

How to manually detect this issue

  • List every external script, style, font, image, frame, and API endpoint used by the page.
  • Open the browser console and review CSP violations after enabling report-only mode.
  • Inspect inline scripts and event handlers that would need nonces or hashes instead of unsafe-inline.

How to fix it

  • Start from a default-src none or tight default and explicitly allow only required sources.
  • Replace unsafe-inline with nonces or hashes where possible.
  • Use report-only mode first, then promote the policy after reviewing violations and business-critical flows.

Common mistakes teams make

  • Copying a generic CSP example from another stack.
  • Allowing entire vendor domains when only one endpoint is needed.
  • Forgetting to update CSP after marketing or product teams add a new dependency.

Related Tools and Guides

Test Security HeadersReferrer Policy CheckThird-Party Domain CheckLearn how Content Security Policy worksLearn how CSP fits into security headers

Frequently Asked Questions

Is a Content Security Policy difficult to generate?+
Creating the basic syntax is easy, but generating a strict policy without breaking existing site functionality takes careful planning. It requires you to know exactly which external domains your site relies on to function.
What is Report-Only mode?+
The `Content-Security-Policy-Report-Only` header allows you to generate a policy and deploy it safely. Instead of blocking resources, the browser just sends a JSON violation report to a server you specify, allowing you to fine-tune the policy before enforcing it.
Should I use 'unsafe-inline'?+
No. Generating a policy with 'unsafe-inline' in the `script-src` directive completely undermines the primary XSS protection of a CSP. You should refactor inline scripts into external files or use cryptographic nonces or hashes.
Does CSP protect against SQL injection?+
No. A Content Security Policy only protects against client-side attacks in the browser (like XSS or data sniffing). It offers zero protection against server-side vulnerabilities like SQL injection or command execution.
Where do I put the generated CSP code?+
The most robust method is to configure your web server (Nginx, Apache) or application framework (Next.js, Express) to send it as an HTTP response header. Alternatively, it can be placed in a `<meta>` tag in the HTML `<head>`, though some directives (like framing controls) are not supported via meta tags.

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