{
    "content": "<p>The <strong>_next\/data<\/strong> route is a fundamental aspect of the <a href=\"..\/Next.js\/\">Next.js<\/a> framework, specifically designed to handle <a href=\"..\/Client-side-Navigation\/\">Client-side-Navigation<\/a> efficiently. When a user navigates using the <a href=\"..\/Link-component\/\">Link-component<\/a>, the application fetches a JSON file containing the pre-calculated props for the target page instead of requesting a full HTML document. This file is located at a path following the pattern <code>\/_next\/data\/[buildID]\/[page].json<\/code>, which is essential for the <a href=\"..\/Hydration\/\">Hydration<\/a> process on the client.<\/p><p>This mechanism supports both <a href=\"..\/Static-Generation\/\">Static-Generation<\/a> and <a href=\"..\/Server-side-Rendering\/\">Server-side-Rendering<\/a>. For pages utilizing <a href=\"..\/getStaticProps\/\">getStaticProps<\/a>, the JSON data is generated at build time. Conversely, for pages using <a href=\"..\/getServerSideProps\/\">getServerSideProps<\/a>, the data is fetched on the server at request time and returned as a JSON payload. Detailed specifications can be found in the <a href=\"https:\/\/nextjs.org\/docs\/pages\/building-your-application\/data-fetching\/get-server-side-props\">Next.js Data Fetching Documentation<\/a> and the <a href=\"https:\/\/vercel.com\/docs\/frameworks\/nextjs\">Vercel Framework Guide<\/a>.<\/p><p>A key component of this system is the <a href=\"..\/Build-ID\/\">Build-ID<\/a>, a unique hash that identifies the specific deployment of the application. The <a href=\"..\/Router\/\">Router<\/a> uses this ID to ensure that the <a href=\"..\/JavaScript\/\">JavaScript<\/a> logic on the client matches the data structure provided by the server. If a mismatch occurs, typically during a new deployment on <a href=\"..\/Vercel\/\">Vercel<\/a>, the system can trigger a full page reload to maintain application integrity and <a href=\"..\/Web-Performance\/\">Web-Performance<\/a>.<\/p><ul><li><a href=\"..\/Incremental-Static-Regeneration\/\">Incremental-Static-Regeneration<\/a><\/li><li><a href=\"..\/Middleware\/\">Middleware<\/a><\/li><li><a href=\"..\/React\/\">React<\/a><\/li><li><a href=\"..\/Data-Fetching\/\">Data-Fetching<\/a><\/li><\/ul>",
    "tags": [
        "nextjs",
        "react",
        "routing",
        "ssr",
        "ssg",
        "performance",
        "frontend",
        "web-development",
        "javascript",
        "vercel",
        "hydration",
        "data-fetching"
    ]
}