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What is next/script and what are its strategy options in Next.js?

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01

Understand the problem

Controlling when third-party scripts load.

nextjsnext-scriptthird-partyperformance
02

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03

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next/script loads third-party scripts with a strategy: beforeInteractive (critical, before hydration), afterInteractive (default, after hydration), lazyOnload (idle), and worker (off main thread). It prevents blocking scripts from hurting performance.

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04

Read the code

Load analytics after interactive
import Script from 'next/script';

// analytics: not critical → after hydration
<Script src="https://analytics.example.com/a.js" strategy="afterInteractive" />;

// chat widget: low priority → when the browser is idle
<Script src="https://chat.example.com/w.js" strategy="lazyOnload" />;
05

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