Audit a Next.js site's SEO with PageAudit

// Audits a page with PageAudit and fails when the page has SEO errors.
// Usage: node scripts/seo-audit.mjs https://example.com/
const page = process.argv[2] ?? "https://example.com/";
const response = await fetch("https://pageaudit.online/api/audit", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({ url: page }),
});
const report = await response.json();
if (response.status === 402 || response.status === 429) {
  console.warn("No free PageAudit audits left today. Run it again tomorrow.");
} else if (!response.ok) {
  console.error(`PageAudit answered ${response.status}: ${report.error}`);
  process.exitCode = 1;
} else {
  const { errors, warnings } = report.counts;
  console.log(`Score ${report.score}: ${errors} errors, ${warnings} warnings`);
  for (const issue of report.issues.filter((i) => i.severity === "error"))
    console.error(`${issue.code}: ${issue.message}`);
  if (errors) process.exitCode = 1;
}

{
  "scripts": {
    "seo:audit": "node scripts/seo-audit.mjs https://example.com/"
  }
}

import type { Metadata } from "next";

export const metadata: Metadata = {
  metadataBase: new URL("https://example.com"),
  title: { default: "Example Store", template: "%s | Example Store" },
  description: "Handmade ceramic mugs and plates, shipped in 3 days.",
  alternates: { canonical: "/" },
  openGraph: { type: "website", siteName: "Example Store", images: ["/og.png"] },
};

// app/robots.ts
import type { MetadataRoute } from "next";

export default function robots(): MetadataRoute.Robots {
  return {
    rules: { userAgent: "*", allow: "/" },
    sitemap: "https://example.com/sitemap.xml",
  };
}

// app/sitemap.ts
import type { MetadataRoute } from "next";

export default function sitemap(): MetadataRoute.Sitemap {
  return [{ url: "https://example.com/", lastModified: new Date() }];
}