# Line Chart

> Multi-series line chart: monotone lines draw in, a snapping crosshair shows every series in one tooltip, legend chips toggle series while the axis rescales smoothly, end labels dodge each other with leader lines, and numbered annotations pin notes to moments. Arrow keys scrub.

- Slug: `line-chart`
- Category: [Charts](https://www.assembli.design/category/charts.md)
- Type: component
- Tags: line, time-series, annotations, crosshair, legend, svg
- npm dependencies: motion
- shadcn/ui dependencies: none
- Added: 2026-10-21
- Live preview: https://www.assembli.design/preview/line-chart
- Page: https://www.assembli.design/components/line-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/line-chart/line-chart.tsx` and installs dependencies):

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

Registry item JSON: https://www.assembli.design/r/line-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.