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stock-market-gen

Generate realistic fake stock market data plus SVG charts and standalone HTML pages. Pure JS, zero dependencies, works in Node and the browser.

A modern, more capable replacement for the old fake-stock-market-generator package.

Why this package

  • Zero dependencies. One small package, no bundled bloat.
  • Works everywhere. Node 14+, modern browsers, ESM and CommonJS.
  • Reproducible. Pass a seed and you get the same output every time, on every machine.
  • Realistic. Geometric Brownian Motion price model — prices stay positive, volatility scales with price level.
  • Bring your own data. Supply close prices or full OHLC bars, the generator fills in whatever's missing.
  • Charts included. Line, area, OHLC bar, candlestick, multi-line comparison — all return self-contained SVG strings.
  • Standalone HTML. Drop a market into renderHtmlPage() and get a self-contained dashboard with clickable cards.

At a glance

```js import { generateStock, renderLineChart } from 'stock-market-gen'; import { writeFileSync } from 'node:fs';

const stock = generateStock({ bars: 250, interval: '1d', seed: 'demo' }); writeFileSync('chart.svg', renderLineChart(stock)); ```

That's it. One stock, one year of daily bars, one SVG chart.

Where to next

  • Getting started Install the package and render your first chart.

  • Guides Step-by-step walkthroughs for every feature.

  • API reference Every function, every option.

  • Recipes Copy-paste examples for common tasks.

Install

bash npm install stock-market-gen

bash pnpm add stock-market-gen

bash yarn add stock-market-gen

Compatibility

Runtime Status
Node 14+ ESM and CJS
Modern browsers ESM bundlers (Vite, esbuild, Rollup, webpack)
Deno ESM via npm specifier
Bun ESM and CJS

License

MIT.