vercel-labs__json-render/examples/dashboard

Dashboard Example

AI-generated dashboard widgets with guardrails. Each widget is streamed from an LLM, constrained by a json-render catalog, and rendered with shadcn components and Recharts. Widgets can fetch and mutate data through named actions that hit a real REST API backed by Postgres.

What it shows

• Streaming widget generation -- useUIStream streams JSONL patches from the server, progressively building each widget's spec.
• Catalog-constrained actions -- the catalog declares typed actions (viewCustomers, createInvoice, approveExpense, etc.) that map to REST endpoints; the registry wires them to real fetch calls with toast feedback.
• Persistence -- widget prompts and specs are saved to Postgres via Drizzle ORM, so widgets survive page reloads.
• Drag-and-drop reorder -- @dnd-kit lets you rearrange widgets, with ordering persisted to the database.
• Edit mode -- send a follow-up prompt to iteratively refine a saved widget.

Setup

pnpm install          # from the monorepo root
cd examples/dashboard
cp .env.example .env

Set the required environment variables:

Variable	Required	Description
DATABASE_URL	Yes	Postgres connection string
AI_GATEWAY_API_KEY	Yes	Vercel AI Gateway key
AI_GATEWAY_MODEL	No	Defaults to anthropic/claude-haiku-4.5
KV_REST_API_URL	No	Upstash Redis URL for rate limiting
KV_REST_API_TOKEN	No	Upstash Redis token
RATE_LIMIT_PER_MINUTE	No	Defaults to 10
RATE_LIMIT_PER_DAY	No	Defaults to 100

Set up the database:

pnpm db:push          # apply the schema to your database
pnpm db:seed          # optional: populate with sample data

Run

pnpm dev
# http://dashboard-demo.json-render.localhost:1355

Requires global portless. The predev script checks for it automatically.

Files

• app/page.tsx -- dashboard grid with drag-and-drop, widget management, and add/edit flows
• app/api/generate/route.ts -- streams text from the model using dashboardCatalog.prompt() as the system prompt
• app/api/v1/ -- REST API for widgets, customers, invoices, expenses, accounts, and reports
• lib/render/catalog.ts -- component catalog with shadcn-based UI primitives and typed business actions
• lib/render/registry.tsx -- maps components to React (shadcn + Recharts) and wires actions to REST calls
• lib/render/renderer.tsx -- DashboardRenderer with state, visibility, and action providers
• lib/db/schema.ts -- Drizzle schema for customers, invoices, expenses, accounts, transactions, and widgets
• components/widget.tsx -- individual widget with useUIStream, auto-action execution, and save/edit logic