Best for
Analysts, investors, or product teams who need an interactive treemap market landscape visualisation they can fill with real sector data.
Stack
A ready-made Market Map UI you can fork, run, and customize with the prompt pack below.
What's actually inside
The honest engineer's breakdown — what the Market Maptemplate does, how it's wired, and where it's opinionated.
The Market Map template centres on a Recharts Treemap where every rectangle represents a company: its area is proportional to the selected size metric (market cap, revenue, or employee count) and its colour maps to a sector. The SectorFilterBar lets users show or hide entire sectors with a single click, the CompanyTooltip fires on hover to surface company name, market cap, and one-day change, and the DataControlBar switches which numeric dimension drives the rectangle sizing — all without a page reload.
The MarketSummaryStats row at the top gives instant context: total market cap in the visible set, number of companies, top gainer, and top loser. The LegendPanel maps each sector colour so readers can orient quickly. These pieces are well-thought-out and genuinely useful for investment teams or product-market-fit slides.
Honest caveat: all data is hardcoded as a static array. The template has no data-fetching layer out of the box, so the treemap will always show the same companies until you wire it to an API route or Supabase table. At 500+ nodes, Recharts SVG rendering can also dip below 60fps — if your dataset is that large, budget a day to explore D3 direct.
Key UI components
MarketTreemapRecharts Treemap rendering market segments as sized, colour-coded rectangles
SectorFilterBarshadcn/ui ToggleGroup to show/hide market sectors in the treemap
CompanyTooltipCustom Recharts tooltip showing company name, market cap, and 1-day change on hover
LegendPanelColour-coded legend mapping sector colours to sector names
DataControlBarControls for switching between market cap / revenue / employee count as the size metric
MarketSummaryStatsHeadline KPI row: total market cap, number of companies, top gainer, top loser
Libraries it leans on
RechartsTreemap and custom tooltip rendering — the core visualisation engine
shadcn/ui ToggleGroupSectorFilterBar toggle buttons for showing/hiding sectors
shadcn/ui CardWraps the MarketSummaryStats KPI blocks
shadcn/ui BadgeChange indicators (+/-%) on the CompanyTooltip and summary stats
Fork it and get it running
Forking takes about 5 minutes in the browser. No terminal or local setup needed — V0 builds and previews everything in Vercel Sandbox.
Open and fork the template
Go to https://v0.dev/chat/community/R8vEpHkisbA. You'll see the market map running in the community preview. Click the blue Fork button in the top-right area of the page. V0 creates a new Project in your account with a full copy of the code — it takes about 15 seconds.
Tip: You need a free V0 account to fork. Sign up at v0.dev if you haven't already.
You should see: A new V0 Project opens with the market map code and a live Vercel Sandbox preview.
Verify the preview
In the Vercel Sandbox preview panel, hover over several cells in the MarketTreemap to confirm the CompanyTooltip appears. Click the SectorFilterBar toggle buttons to hide and show sectors. Check that the MarketSummaryStats row updates. If anything looks blank, try refreshing the preview pane — the sandbox can be slow to warm up.
You should see: Treemap cells render with colours, CompanyTooltip fires on hover, and SectorFilterBar toggles work.
Adjust colours and copy in Design Mode
Press Option+D (or click the Design tab icon) to open Design Mode. Click the LegendPanel or any cell to update sector colours. Update the headline copy in MarketSummaryStats. Design Mode changes cost zero credits — do all visual tweaks here before touching the chat.
Tip: Write down the hex codes you want for each sector before entering Design Mode so you can apply them quickly.
You should see: Sector colours and headline copy update in the preview immediately.
Replace sample data with your real dataset
In the V0 chat input, paste prompt 1 from the Prompt Pack below with your company or product data. V0 rewrites the static data array in MarketTreemap and updates CompanyTooltip and SectorFilterBar to reflect your real sectors. Review the preview to make sure all sectors and companies appear correctly.
You should see: MarketTreemap shows your real company names with correct sector colours and tooltip data.
Publish to a live URL
Click the Share button (top-right, next to the settings gear) then select the Publish tab. Click 'Publish to Production' — Vercel builds and deploys the market map in about 30 seconds. You get a live *.vercel.app URL you can share immediately.
Tip: Each time you make a change and want to update the live URL, click Share → Publish → 'Publish to Production' again.
You should see: The market map is live on a Vercel subdomain and publicly accessible.
Add a custom domain (optional)
For a branded URL, open the Vercel Dashboard at vercel.com, find your market map project, go to Settings → Domains, and add your domain. Vercel walks you through the DNS changes — typically a CNAME or A record. For scheduled data refreshes, prompt V0 to add export const revalidate = 300 to the server component so the treemap auto-refreshes every 5 minutes.
You should see: The market map loads on your custom domain with automatic HTTPS.
The prompt pack
Copy-paste these straight into v0's chat to customize the Market Maptemplate. Each one names this template's own components — no generic filler.
Replace sample data with real market data
Replaces the hardcoded sample company array with your real market data while preserving the tooltip and filter interactions.
In the market map template, replace all sample company data in the MarketTreemap with the following real dataset. Each company should have: name, sector, market_cap_billions, one_day_change_pct, and a colour assigned by sector. Keep the CompanyTooltip wired to show the company name, market cap, and change percentage on hover, and keep the SectorFilterBar toggle logic working for all sectors in the new data: [paste your data here].
Colour cells by daily price change
Switches the treemap to a gain/loss heatmap view so viewers can instantly spot movers without reading tooltips.
In the market map MarketTreemap, colour each cell by its one_day_change_pct value instead of by sector. Cells with a positive change should be green with intensity proportional to the gain, negative change should be red with intensity proportional to the loss, and cells within ±0.1% should be grey. Keep the sector border outlines visible. Update the LegendPanel to show a gain/loss colour scale instead of sector colours, and keep the CompanyTooltip showing the actual change percentage.
Add click-to-drill-down into a sector
Adds a drill-down navigation layer so users can zoom into a single sector and see its companies at higher resolution.
In the market map template, make the MarketTreemap cells clickable at the sector level: clicking a sector area in the treemap should update the view to show only companies in that sector, re-scaling the treemap to fill the full container width. Add a breadcrumb above the MarketTreemap showing the current sector with an 'All sectors' back link that resets to the full view. Store the selected sector in useState and pass it to both MarketTreemap and the breadcrumb component.
Wire the DataControlBar metric switcher
Makes the DataControlBar functional so analysts can switch between market cap, revenue, and headcount views without reloading the page.
Wire the DataControlBar in the market map template so the user can switch the Treemap size metric between market_cap, revenue, and employee_count. When a different metric is selected, re-sort the company data array by the new metric value and update MarketTreemap so cell sizes reflect the new dimension. Display the active metric in the DataControlBar as a highlighted shadcn/ui ToggleGroup button. Ensure the CompanyTooltip still shows all three metric values regardless of which one is active.
Fetch live market data from an API route
Connects the treemap to a live data feed via a secure server-side API route with 5-minute ISR refresh.
Add a Next.js App Router route handler at /api/market-data/route.ts that fetches real market data from my data provider's REST API using the API key stored in MARKET_DATA_API_KEY — no NEXT_PUBLIC_ prefix since this is server-only. Return a JSON response matching the company data shape expected by MarketTreemap: array of { name, sector, market_cap_billions, one_day_change_pct }. On the market map page, fetch from this route in a Server Component and add export const revalidate = 300 so the MarketTreemap auto-refreshes every 5 minutes via ISR without a full deployment.Add Supabase-backed watchlist
Adds persistent per-user watchlists backed by Supabase RLS and Clerk auth so each visitor can save companies they are tracking.
Add a watchlist feature to the market map template. When a user clicks a company cell in MarketTreemap, show an 'Add to Watchlist' button inside the CompanyTooltip. Save the watchlist to a Supabase table called watchlist (user_id uuid, company_name text, added_at timestamptz) with RLS policies so each user can only read and write their own rows. Use Clerk for auth — get the user ID from auth() in server components and pass it as a header to the Supabase client. Add a /watchlist page that lists the user's saved companies with their current one_day_change_pct fetched from the same data source as the main map.
Gotchas when you extend it
The failures people actually hit when they push this template past its defaults — and the exact fix for each.
Recharts: Treemap component throws "window is not defined" during SSRWhy: Recharts accesses window.ResizeObserver internally. Next.js attempts to server-render the MarketTreemap component, which crashes in the Node.js environment where window is not available.
Fix: Wrap the MarketTreemap component in dynamic(() => import('./MarketTreemap'), { ssr: false }) in the parent page component.
Wrap the MarketTreemap component in the market map template in a Next.js dynamic() import with ssr: false to prevent the 'window is not defined' crash during server rendering.
CompanyTooltip flickers and disappears when cursor moves between adjacent cellsWhy: The Recharts default tooltip has a mouseLeave delay mismatch with the Treemap's cell boundary detection. Adjacent cells briefly report no hover target, causing the tooltip to hide and immediately re-show.
Fix: Set isAnimationActive={false} on the Treemap and add a 100ms debounce delay before hiding the tooltip using a useRef timeout.
Fix the CompanyTooltip flickering in the market map by setting isAnimationActive={false} on the Recharts Treemap and adding a 100ms debounce before hiding the tooltip on mouseLeave.SectorFilterBar deselecting all sectors renders an empty Treemap with no feedbackWhy: When all sectors are toggled off, the filtered data array is empty and Recharts Treemap renders nothing — the page looks broken with a white box where the chart was.
Fix: Add a fallback render: when the filtered dataset is empty, show a centred message inside the chart container reading 'No sectors selected — toggle a sector to display data.'
Add an empty-state message in the market map MarketTreemap that shows 'No sectors selected' when all SectorFilterBar toggles are off, replacing the blank chart area.
Market map export via Share → Publish shows cells at wrong sizes on first loadWhy: Recharts Treemap requires a known container width to calculate cell sizes. On initial load, if the container width is 0 before paint, all cells render at the same size.
Fix: Wrap MarketTreemap in a Recharts ResponsiveContainer with minHeight set to ensure the container has dimensions before the Treemap renders.
Wrap the market map MarketTreemap in a Recharts ResponsiveContainer with minHeight={400} so cell sizes are calculated correctly on first render rather than defaulting to equal widths.DataControlBar metric switch causes visible loading flash on every toggleWhy: Each metric switch triggers a new data fetch if data is not pre-cached. The Treemap briefly shows empty while the new dataset loads.
Fix: Fetch all three metric datasets once on page load and store them in a ref or state. The DataControlBar then switches between in-memory arrays with no fetch.
Preload all three metric datasets (market_cap, revenue, employee_count) in the market map page on initial load and store them in a ref, so DataControlBar switches between them instantly without re-fetching.
Template vs. custom — the honest call
A forked template gets you far, fast. Here's where it holds up, and where you'll outgrow it.
The template is enough when
- Investment team or analyst who needs a one-pager market landscape visualisation for internal use
- SaaS product adding a market-map feature screen for a demo or investor pitch deck
- Developer who wants a Recharts Treemap scaffold with working tooltips and sector filters already built
- Content team publishing a visual industry landscape that refreshes via ISR
Go custom when
- You need real-time streaming price data with sub-second WebSocket updates across hundreds of tickers
- The map must handle 500+ companies without performance degradation — Recharts SVG can slow below 60fps at scale and D3 direct is a better fit
- You need print-quality SVG export, PDF generation, or embeddable iframe output for external reports
RapidDev can wire your market map to a live data feed, add Supabase persistence for watchlists, and optimise the Recharts rendering for large datasets — see rapidevelopers.com.
Frequently asked questions
Is the Market Map v0 template free to use?
Yes. All community templates on v0.dev are free to fork. Forking the market map costs zero V0 credits; subsequent AI chat edits draw on your credit balance at the normal rate.
Can I use this template commercially?
V0 community templates are published under an MIT-style license — you can use, modify, and deploy the Market Map template in commercial projects without attribution. Always verify the license shown on the template's community page before launching a paid product.
Why does my forked market map look blank in the Vercel Sandbox preview?
The most common cause is Recharts trying to render server-side. The MarketTreemap component uses browser APIs (window.ResizeObserver) that don't exist in Node.js. Add 'use client' to the MarketTreemap file or wrap it in dynamic(() => import('./MarketTreemap'), { ssr: false }) to fix this.
How do I connect real market data to the treemap?
Add a Next.js route handler at /api/market-data/route.ts that calls your data provider using a server-only env var (no NEXT_PUBLIC_ prefix). Fetch from this route in the page Server Component and add export const revalidate = 300 for 5-minute ISR refreshes. Prompt 5 in the Prompt Pack above walks through the full implementation.
The SectorFilterBar toggle shows an empty chart when I deselect all sectors — is that a bug?
It is a known gap in the template. When the filtered data array is empty, Recharts Treemap renders nothing. Use the fix prompt under the relevant gotcha above to add an empty-state message so the UI stays informative.
Will the Recharts Treemap perform well with 500+ companies?
Likely not at smooth 60fps. Recharts renders every cell as an SVG element and the DOM count grows linearly. Below 300 nodes performance is fine; above 500 you should consider switching to a D3 canvas-based treemap for better performance.
Can RapidDev help me build a production version of this market map?
Yes. RapidDev connects V0 prototypes to live data feeds, adds Supabase persistence, and optimises Recharts rendering for larger datasets. Reach out at rapidevelopers.com to discuss your project.
Can I embed the market map in an existing Next.js app?
Yes. Use the GitHub integration in V0 (Git panel → Connect) to push the template to a branch. Merge via PR and import the MarketTreemap, SectorFilterBar, and supporting components into your existing project. You will need Recharts and shadcn/ui installed.
Outgrowing the template?
RapidDev turns v0 prototypes into production apps — real auth, database, and payments — at $13K–$25K.
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