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+---
+title: "Stop Pasting URLs into Security Header Sites — Use This CLI"
+published: false
+description: 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.
+tags: security, webdev, devops, javascript
+cover_image: <COVER_IMAGE_URL>
+canonical_url: https://github.com/hailbytes/security-headers
+published_at: 2026-05-21 13:00 +0000
+---
+
+<!--
+COVER IMAGE PROMPT (1000x420, 2.4:1 banner):
+
+Flat vector illustration, isometric perspective. A stylized laptop with an open terminal
+window showing a list of HTTP security header names (CSP, HSTS, X-Frame-Options) as
+abstract bars — readable as a list but not literal text. A large translucent report-card or
+badge floats above the terminal displaying a bold letter grade in the shape of an "A+"
+(rendered as a graphic emblem, not typed text). Decorative padlock and shield icons orbit
+the laptop. Dark navy (#0a1628) background, electric cyan (#00d4ff) primary, soft green
+(#5eead4) for the grade badge, amber (#ffb347) accent. Banner composition. Avoid any
+literal text strings — render letters only as iconic shapes.
+
+Suggested generators: Midjourney v6+ with `--ar 1000:420 --style raw`, DALL-E 3, or Flux.
+After generation, host on Cloudinary or GitHub raw and replace <COVER_IMAGE_URL> above.
+-->
+
+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
+
+```bash
+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:
+
+```bash
+npx @hailbytes/security-headers https://staging.example.com || exit 1
+```
+
+## Library
+
+```ts
+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):
+
+```ts
+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:
+
+| Grade | Score |
+|---|---|
+| A+ | ≥ 90% |
+| A  | ≥ 75% |
+| B  | ≥ 60% |
+| C  | ≥ 40% |
+| D  | ≥ 20% |
+| F  | < 20% |
+
+```bash
+npm install @hailbytes/security-headers
+```
+
+Source: [github.com/hailbytes/security-headers](https://github.com/hailbytes/security-headers) — MIT licensed.