Dev shares three critical Next.js App Router bugs that silently broke 1,200 static pages

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A developer building factorcalculator.org, a free math tool generating 1,200 static pages, discovered that Next.js App Router does not treat mixed-text folder names like 'factors-of-[number]' as dynamic routes, causing all generated pages to silently fail. The fix required restructuring the route as a plain '[slug]' segment and parsing the URL prefix manually within the page component. A second bug stemmed from JavaScript's toLocaleString() producing different number formats on the server versus the client, causing hydration mismatches that took multiple attempts to resolve properly. The developer also implemented safeguards such as dynamicParams=false to prevent on-demand rendering of unintended URLs and a leading-zero check to block duplicate content from crawlers. The post concludes with an honest account of post-deployment traffic, noting that the technical build was ultimately the least eventful part of the project.

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Backpack Wallet Review: A Multi-Chain Crypto Wallet Built for DeFi and Beyond

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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