id or slug.If you just upgraded a Next.js project and your dynamic route page started throwing errors about params, welcome to the club. Somewhere between one version and the next, the Next.js team quietly decided that params — the innocent little object that hands you your dynamic route segments like id or slug — is no longer a plain object. It is now a Promise. Yes, a Promise. The same thing you get back from fetch(), except this time it’s just holding a string.
This one change trips up a shocking number of developers, mostly because the error message Next.js gives you is about as helpful as a fortune cookie. So let’s break down exactly what’s happening, why it’s happening, and how to fix your code without losing your mind (or your afternoon).
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