Building a trading UI? Tired of paying for market data APIs just to test your dashboard? trade-data-generator generates realistic synthetic market data for equity, forex and crypto. → Price ticks with mean reversion → Order book depth (bid always below ask) → OHLCV candles — multiple intervals → Market hours for equity and forex → EventEmitter API — any WebSocket server → Zero dependencies → TypeScript support 836 downloads. MIT license. Node.js 14+ See it live at tradesim.dev/demo