# Bar Chart

> Grouped bar chart in plain HTML: bars grow from the baseline in a stagger, a recessive grid, legend, and a hover column with a tooltip for every series. Colorblind-validated palette and a hidden data table.

- Slug: `bar-chart`
- Category: [Charts](https://www.assembli.design/category/charts.md)
- Type: component
- Tags: bar, chart, grouped, tooltip, dataviz
- npm dependencies: motion
- shadcn/ui dependencies: none
- Added: 2026-10-15
- Live preview: https://www.assembli.design/preview/bar-chart
- Page: https://www.assembli.design/components/bar-chart

## Install

One-time setup (needs a subscription):

1. Add the registry to the project's `components.json`: `{"@assembli":{"url":"https://www.assembli.design/r/{name}.json","headers":{"Authorization":"Bearer ${ASSEMBLI_API_KEY}"}}}` (merge into `"registries"`).
2. Put an API key from https://www.assembli.design/account in `.env.local` as `ASSEMBLI_API_KEY=asm_…`.

Then install with the shadcn CLI (writes `components/bar-chart/bar-chart.tsx` and installs dependencies):

```bash
npx shadcn@latest add @assembli/bar-chart
```

Registry item JSON: https://www.assembli.design/r/bar-chart.json (send `Authorization: Bearer <api key>`)

## Code

> Component source needs an Assembli subscription ($12/month) and an API key sent as `Authorization: Bearer <key>`. To get one without copying anything, POST https://www.assembli.design/api/agent/login (or call the MCP tool connect_account), show the user the link it returns, and poll https://www.assembli.design/api/agent/token for the key. Or subscribe at https://www.assembli.design/pricing and create a key at https://www.assembli.design/account.