Get an A–F grade for your site's HTTP security headers without leaving the terminal. Use it as a library, a CLI, or a CI gate that fails deploys on regression.

The flow goes like this:

1. Ship a deploy.
2. Alt-tab to securityheaders.com.
3. Paste in the URL.
4. Squint at the report.
5. Realize someone removed the CSP three weeks ago and nobody noticed.

I wanted step 2 to be npx.

CLI

npx @hailbytes/security-headers https://example.com

Prints a color report to the terminal. Add --json to feed it into other tools, or just rely on the non-zero exit code on grade D or F to use it as a CI gate:

npx @hailbytes/security-headers https://staging.example.com || exit 1

Library

import { analyze } from '@hailbytes/security-headers';

const report = await analyze('https://example.com');
// { grade: 'A+', score: 95, percentage: 95, headers: [...] }

Or pass raw headers (for unit tests, or middleware that wants to grade its own response before sending):

import { analyzeHeaders } from '@hailbytes/security-headers';

const report = analyzeHeaders({
  'strict-transport-security': 'max-age=31536000; includeSubDomains',
  'content-security-policy': "default-src 'self'",
  'x-frame-options': 'DENY',
  // ...
});

What it checks

Seven categories — HSTS, CSP, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, and the Cross-Origin family (COEP/COOP/CORP). Each header gets a numeric score, a status (good / warning / missing / error), and specific remediation strings you can drop straight into a ticket.

The grading scale is the obvious one:

npm install @hailbytes/security-headers

Source: github.com/hailbytes/security-headers — MIT licensed.