vue

SSR hydration mismatch

Hydration.*mismatch|hydrat(ion|e).*expected.*but received

Fixes

1.Wrap browser-only code in onMounted() or <ClientOnly>
2.Ensure server and client render identical initial HTML
3.Use useId() for consistent IDs between server and client renders

vuessrhydration

Related Errors

Cannot read property of undefined in setup()

Cannot read propert(y|ies) of undefined.*setup

•Initialize reactive refs before accessing nested properties
•Add optional chaining (?.) when accessing potentially undefined objects

Computed property getter returns undefined

computed property.*getter.*undefined

•Ensure computed getter always returns a value
•Check that reactive dependencies are initialized before computed runs

Direct prop mutation warning

Avoid mutating a prop directly

•Use a local data/ref copy of the prop instead of mutating directly
•Emit an event to let the parent update the prop value