CSP & SRI Policy Builder

What This Tool Does

CSP & SRI Policy Builder is built for deterministic developer and agent workflows.

Build strict Content-Security-Policy headers and Subresource Integrity templates with practical defaults for modern frontend security hardening.

Use How to Use for execution steps and FAQ for constraints, policies, and edge cases.

Last updated:

This tool is provided as-is for convenience. Output should be verified before use in any production or critical context.

Agent Invocation

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.

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.

Frequently Asked Questions

What is CSP & SRI Policy Builder?
CSP & SRI Policy Builder creates hardened Content-Security-Policy headers and Subresource Integrity tag snippets for frontend assets.
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.