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CSP & SRI Policy Builder

Build strict CSP header templates and SRI tag snippets for frontend script hardening and safer deployments

CSP & SRI Policy Builder

CSP header and SRI tags built

{
  "cspHeader": "default-src 'self'; script-src 'self' https://cdn.jsdelivr.net/npm/; style-src 'self' https://fonts.googleapis.com; connect-src 'self' https://api.example.com; img-src 'self' data: https://images.example.com; font-src 'self' https://fonts.gstatic.com; frame-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'; report-uri https://report.example.com/csp",
  "reportOnlyHeader": "default-src 'self'; script-src 'self' https://cdn.jsdelivr.net/npm/ 'report-sample'; style-src 'self' https://fonts.googleapis.com 'report-sample'; connect-src 'self' https://api.example.com; img-src 'self' data: https://images.example.com; font-src 'self' https://fonts.gstatic.com; frame-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'; report-uri https://report.example.com/csp",
  "sriTags": [
    "<script src=\"https://cdn.jsdelivr.net/npm/app.js\" integrity=\"sha256-UNhY4JhezH9gQYqvDMWrWH9CwlcKiECVqejMrND2VFw=\" crossorigin=\"anonymous\"></script>"
  ]
}

Updated . Provided as is. Check the output before you rely on it in production.

How to use CSP & SRI Policy Builder

  1. 1

    Define source lists and inline allowances

    Provide script, style, connect, image, font, and frame source arrays plus inline toggles to model your target policy.

  2. 2

    Add assets for SRI tags

    Include external asset URLs and hashes so the tool can generate script or link tags with integrity attributes.

  3. 3

    Generate CSP and report-only headers

    Click Build CSP + SRI to produce enforce and report-only header variants for staged rollout.

  4. 4

    Apply headers and verify in browser

    Deploy generated headers to your edge or app server, then validate console violations and network behavior before enforcing fully.

Questions and answers

What is CSP & SRI Policy Builder?
Content-Security-Policy is a header listing where a page may load scripts, styles and other resources from; Subresource Integrity adds a hash so the browser rejects a tampered file. This tool builds enforce and report-only CSP headers from your source lists and script or link tags with sha256 integrity attributes.
What output do I get?
The tool produces enforce-mode and report-only CSP header variants plus HTML tag snippets containing integrity and crossorigin attributes for listed assets.
Can it include report-only policies?
Yes. It generates a report-oriented variant so you can observe violations before enforcing strict CSP in production.
Does CSP & SRI Policy Builder store or send my data?
No. Header composition and SRI assembly are local browser operations with no backend dependency.
For AI agents: how to call this tool

Machine-readable contract, endpoints and examples. Humans can ignore this section.

Best Path For Builders

Browser workflow

Runs instantly in the browser with private local processing and copy/export-ready output.

Browser Workflow

This tool is optimized for instant in-browser execution with local data handling. Run it here and copy/export the output directly.

/csp-sri-policy-builder/

For automation planning, fetch the canonical contract at /api/tool/csp-sri-policy-builder.json.