I'm using Angular 20 with server-side rendering (Angular SSR). Everything works correctly on most routes, but I encounter a hydration error on dynamic routes like /news/:category or /tools/:id. The error appears in the browser console after hydration: main.ts:6 ERROR Error: ASSERTION ERROR: Unexpected state: no hydration info available for a given TNode, which represents a view container. [Expected=> null != undefined <=Actual] If I change the same component to use a static route (e.g., /news/general without a route parameter), the error does not occur and hydration completes without issues. It seems like Angular is failing to hydrate properly when dynamic route parameters are involved. What I've tried: Verified that the component renders properly in SSR and client modes. Ensured that data fetching completes on the server before hydration. Compared static vs dynamic route behavior — only dynamic routes trigger the error. Looked through Angular SSR documentation, but couldn’t find a clear solution. Questions: What might be causing this hydration error only on dynamic routes? Are there any examples or best practices for configuring Angular 20 SSR properly with dynamic routes? Is there a workaround or fix for this issue? Continue reading...
