Sessions cannot be used with an adapter that doesn't support server output.

import DontEditWarning from '~/components/DontEditWarning.astro'

:::caution[Deprecated] This error was removed in Astro 5.7, when the Sessions feature stopped being experimental. :::

SessionWithoutSupportedAdapterOutputError: Sessions require an adapter that supports server output. The adapter must set "server" in the buildOutput adapter feature.

What went wrong?

Your adapter must support server output to use sessions.

See Also:

Sessions