vercel/next.js / errors / no-before-interactive-script-outside-document.mdx

---

title: No Before Interactive Script Outside Document

Prevent usage of next/script's beforeInteractive strategy outside of a root layout or pages/_document.js.

Why This Error Occurred

You cannot use the next/script component with the beforeInteractive strategy outside a root layout or pages/_document.js. That's because beforeInteractive strategy only works inside a root layout or pages/_document.js and is designed to load scripts that are needed by the entire site (i.e. the script will load when any page in the application has been loaded server-side).

Possible Ways to Fix It

App Router

If you want a global script, and you are using the App Router, move the script inside a root layout, any layout without a layout.js above it.

import Script from 'next/script'

export default function RootLayout({ children }) {
  return (
    <html lang="en">
      <body>{children}</body>
      <Script
        src="https://example.com/script.js"
        strategy="beforeInteractive"
      />
    </html>
  )
}

Pages Router

If you want a global script, and you are using the Pages Router, move the script inside pages/_document.js.

import { Html, Head, Main, NextScript } from 'next/document'
import Script from 'next/script'

export default function Document() {
  return (
    <Html>
      <Head />
      <body>
        <Main />
        <NextScript />
        <Script
          src="https://example.com/script.js"
          strategy="beforeInteractive"
        ></Script>
      </body>
    </Html>
  )
}

Useful Links

• App Router Script Optimization
• Pages Router Script Optimization