Schema Injection for Headless Apps: Next.js, Astro, Nuxt, and Remix

> TL;DR
> - Headless apps have no CMS schema plugins — structured data must be added in code or via injection
> - AI agents can't discover or purchase from headless apps without schema — the gap is total
> - Working code examples for every major framework
> - Or skip the code: one script tag handles it all →

Updated: April 21, 2026

---

The Headless Schema Gap

Traditional CMS platforms (WordPress, Shopify) at least generate partial schema through plugins. Headless apps — built on Next.js, Astro, Nuxt, Remix, or custom React — generate zero schema by default.

Your headless app might be blazing fast, beautifully designed, and technically excellent. To an AI agent crawling the web for products, services, or software to recommend or purchase, it's a blank page.

Schema injection bridges this gap without requiring architectural changes.

---

Option A: Schema Injection Script (Zero Code)

Add one script tag to your app's . SchemaInject detects page type and generates the correct schema automatically.

Next.js (App Router)

In app/layout.tsx:

export default function RootLayout({ children }: { children: React.ReactNode }) {
  return (
    
      
                  src="https://schema-inject-cdn.justinspollack.workers.dev/inject.js?key=YOUR_KEY"
          async
        />
      
      {children}
    
  )
}

Next.js (Pages Router)

In pages/_document.tsx:

import { Html, Head, Main, NextScript } from 'next/document'
export default function Document() {
  return (
    
      
                  src="https://schema-inject-cdn.justinspollack.workers.dev/inject.js?key=YOUR_KEY"
          async
        />
      
      
        

        
      
    
  )
}

Astro

In src/layouts/Layout.astro:

---
// Layout.astro
---

  
          src="https://schema-inject-cdn.justinspollack.workers.dev/inject.js?key=YOUR_KEY"
      async
      is:inline
    >
  
  
    
  

Nuxt 3

In nuxt.config.ts:

export default defineNuxtConfig({
  app: {
    head: {
      script: [
        {
          src: 'https://schema-inject-cdn.justinspollack.workers.dev/inject.js?key=YOUR_KEY',
          async: true
        }
      ]
    }
  }
})

Remix

In app/root.tsx:

import { Links, Meta, Outlet, Scripts } from "@remix-run/react";
export default function App() {
  return (
    
      
        
        
                  src="https://schema-inject-cdn.justinspollack.workers.dev/inject.js?key=YOUR_KEY"
          async
        />
      
      
        
        
      
    
  );
}

Get your key from the free audit →

---

Option B: Native JSON-LD Components (Code Path)

For full control, implement schema as reusable components that accept your data as props.

Next.js — Reusable Schema Component

// components/SchemaMarkup.tsx
interface SchemaProps {
  schema: Record
}
export function SchemaMarkup({ schema }: SchemaProps) {
  return (
          type="application/ld+json"
      dangerouslySetInnerHTML={{
        __html: JSON.stringify(schema)
      }}
    />
  )
}

Usage on a SaaS product page:

// app/page.tsx
import { SchemaMarkup } from '@/components/SchemaMarkup'
export default function HomePage() {
  const schema = {
    "@context": "https://schema.org/",
    "@type": "SoftwareApplication",
    "name": "YourApp",
    "description": "...",
    "applicationCategory": "BusinessApplication",
    "offers": [{
      "@type": "Offer",
      "name": "Free",
      "price": "0",
      "priceCurrency": "USD"
    }]
  }
  return (
    <>
      
      {/ page content /}
    
  )
}

Astro — Static Schema

---
// ProductPage.astro
const schema = {
  "@context": "https://schema.org/",
  "@type": "Product",
  "name": Astro.props.productName,
  "offers": {
    "@type": "Offer",
    "price": Astro.props.price,
    "priceCurrency": "USD",
    "availability": "https://schema.org/InStock"
  }
}
---