#Problem with private cache control code#bundlejs - An online tool to quickly bundle & minify your projects, while viewing the compressed gzip/brotli bundle size, all running locally on your browser.Įach file inside your pages/ directory will automatically be code split into its own JavaScript bundle during next build.Webpack Bundle Analyzer – Visualize the size of webpack output files with an interactive, zoomable treemap.Bundle Phobia - Analyze how much a dependency can increase bundle sizes.Package Phobia – Find the cost of adding a new dev dependency to your project.Import Cost – Display the size of the imported package inside VSCode.To reduce the amount of JavaScript sent to the browser, you can use the following tools to understand what is included inside each JavaScript bundle: If you are using Vercel, Edge Caching works without configuration. If you are self-hosting, you will need to add this logic yourself using a key/value store like Redis. Note: Your deployment provider must support caching for dynamic responses. If the page is using getStaticProps, it will have a Cache-Control header of s-maxage=REVALIDATE_SECONDS, stale-while-revalidate, or if revalidate is not used, s-maxage=31536000, stale-while-revalidate to cache for the maximum age possible.If you want a different cache behavior while using getServerSideProps, use res.setHeader('Cache-Control', 'value_you_prefer') inside of the function as shown above. If the page uses getServerSideProps or getInitialProps, it will use the default Cache-Control header set by next start in order to prevent accidental caching of responses that cannot be cached.export async function getServerSideProps ( īy default, Cache-Control headers will be set differently depending on how your page fetches data. If you refresh the page, you will see the new value. // In the background, a revalidation request will be made to populate the cache // with a fresh value. If the request is repeated before 59 seconds, // the cached value will be stale but still render (stale-while-revalidate=59). If a request is repeated within the next 10 seconds, the previously // cached value will still be fresh. This value is considered fresh for ten seconds (s-maxage=10). For example, using stale-while-revalidate. You can also use caching headers inside getServerSideProps and API Routes for dynamic responses. Cache-Control: no-cache, no-store, max-age=0, must-revalidate Note: When running your application locally with next dev, your headers are overwritten to prevent caching locally. If you're using next/image, there are also specific caching rules for the default Image Optimization loader. If you need to revalidate the cache of a page that has been statically generated, you can do so by setting revalidate in the page's getStaticProps function. Cache-Control: public, max-age=31536000, immutableĬache-Control headers set in will be overwritten in production to ensure that static assets can be cached effectively. Next.js automatically adds caching headers to immutable assets served from /_next/static including JavaScript, CSS, static images, and other media. next/image and Automatic Image OptimizationĬaching improves response times and reduces the number of requests to external services.Review Supported Browsers and Features.For best results, use a production build of Next.js and use incognito in your browser so results aren't affected by extensions. Run Lighthouse to check for performance, best practices, accessibility, and SEO.Configure the 404 (Not Found) and 500 (Error) pages.Defer loading heavy JavaScript bundles until needed.Aim to ship the least amount of JavaScript possible.Ensure your database and backend are deployed in the same region.Before taking your Next.js application to production, here are some recommendations to ensure the best user experience.
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