Storybook
Storybook is a development and documentation environment that displays each interface component (button, card, form) in isolation, with its state variants (loading, error, disabled). Designers, developers, and product owners can review and validate the design system without launching the whole app.
On a somewhat mature React or Next.js frontend, Storybook becomes the living catalog of the design system: you check accessibility, edge states, and consistency before wiring a component into a flow. It's also a collaboration tool: a PO can validate an error state without waiting for a staging deploy.
Keeping Storybook up to date takes discipline. If stories aren't written with the components, or nobody runs them in CI, the tool becomes an obsolete museum. The other mistake is documenting components never used in production: better fewer stories, aligned with the real design system.
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