Next.js params Is a Promise: Fix the Async Params Error
`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.
app-router
2 PostsNext.js params/searchParams: Fixing the Promise Error
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.