Route "/[slug]" used `params.slug`. `params` should be awaited before using its properties — here's exactly why Next.js 15+ broke synchronous params, and how to fix every case.
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nextjs
`params` is a Promise and must be unwrapped with await or React.use() before accessing its properties — the exact fix for Next.js 15 and 16 App Router.
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nextjs
Next.js turned params and searchParams into Promises. Here's the exact warning text, why v16 makes it crash instead of warn, and how to fix it for good.
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nextjs