ritmex-bot/docs/ccxt/wiki/examples/js/fetch-ohlcv-many-exchanges-continuosly.md

- [Fetch Ohlcv Many Exchanges Continuosly](./examples/js/)


 ```javascript
 import ccxt from '../../js/ccxt.js';
// AUTO-TRANSPILE //
// fetch and handle constinuosly
async function fetchOHLCVContinuously(exchange, symbol) {
    while (true) {
        try {
            const ohlcv = await exchange.fetchOHLCV(symbol);
            const ohlcvLength = ohlcv.length;
            console.log('Fetched ', exchange.id, ' - ', symbol, ' candles. last candle: ', ohlcv[ohlcvLength - 1]);
        }
        catch (e) {
            console.log(e);
            break;
        }
    }
}
// start exchanges and fetch OHLCV loop
async function startExchange(exchangeName, symbols) {
    const ex = new ccxt[exchangeName]({});
    const promises = [];
    for (let i = 0; i < symbols.length; i++) {
        const symbol = symbols[i];
        promises.push(fetchOHLCVContinuously(ex, symbol));
    }
    await Promise.all(promises);
    await ex.close();
}
// main function
async function example() {
    const exchanges = ['binance', 'okx', 'kraken'];
    const symbols = ['BTC/USDT', 'ETH/USDT'];
    const promises = [];
    for (let i = 0; i < exchanges.length; i++) {
        const exchangeName = exchanges[i];
        promises.push(startExchange(exchangeName, symbols));
    }
    await Promise.all(promises);
}
await example();
 
```