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2026-09-11 01:08:07 +00:00 · 2025-10-03 15:28:16 +08:00
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+- [Shared Load Markets](./examples/js/)
+
+
+ ```javascript
+ import ccxt from '../../js/ccxt.js';
+
+// ----------------------------------------------------------------------------
+// an example of how to load markets for each exchange just once
+// in order to save memory and time for initializing multiple exchange instances
+// see https://github.com/ccxt/ccxt/issues/7312 for details
+// ----------------------------------------------------------------------------
+
+const globalIds = [ 'binance', 'poloniex', 'bittrex', 'bitstamp' ]
+const globalExchanges = {}
+
+async function loadExchange (id) {
+    try {
+        const exchange = new ccxt[id] ()
+        await exchange.loadMarkets ()
+        globalExchanges[id] = exchange
+    } catch (e) {
+        // throw e // uncomment to break the entire program on any error
+        // console.log (e) // print the exception and ignore this exchange
+    }
+}
+
+async function main () {
+
+    // initialize unique global exchange instances first
+    await Promise.all (globalIds.map (async (id) => loadExchange (id)))
+    console.log ('Loaded global exchanges:', Object.keys (globalExchanges))
+
+    // load user exchanges and keys from a database or configure these via JSON
+    const users = {
+        'user1': {
+            'binance': { 'apiKey': 'USER1_BINANCE_API_KEY', 'secret': 'USER1_BINANCE_SECRET' },
+            'poloniex': { 'apiKey': 'USER1_POLONIEX_API_KEY', 'secret': 'USER1_POLONIEX_SECRET' }
+        },
+        'user2': {
+            'poloniex': { 'apiKey': 'USER2_POLONIEX_API_KEY', 'secret': 'USER2_POLONIEX_SECRET' },
+            'bittrex': { 'apiKey': 'USER2_BITTREX_API_KEY', 'secret': 'USER2_BITTREX_SECRET' }
+        },
+        'user3': {
+            'bittrex': { 'apiKey': 'USER3_BITTREX_API_KEY', 'secret': 'USER3_BITTREX_SECRET' },
+            'bitstamp': { 'apiKey': 'USER3_BITSTAMP_API_KEY', 'secret': 'USER3_BITSTAMP_SECRET' }
+        }
+    }
+
+    // initialize local exchanges per user
+    const localExchanges = {}
+    for (const userId in users) {
+        const userExchanges = {}
+        for (const exchangeId in users[userId]) {
+            if (exchangeId in globalExchanges) {
+                const globalExchange = globalExchanges[exchangeId]
+                const exchange = new ccxt[exchangeId] ({
+                    // 'verbose': true, // uncomment for debug output
+                    ... users[userId][exchangeId],
+                });
+                [
+                    'ids',
+                    'markets',
+                    'markets_by_id',
+                    'currencies',
+                    'currencies_by_id',
+                    'baseCurrencies',
+                    'quoteCurrencies',
+                    'symbols',
+                ].forEach ((propertyName) => {
+                    exchange[propertyName] = globalExchange[propertyName]
+                })
+                userExchanges[exchangeId] = exchange
+            }
+        }
+        localExchanges[userId] = userExchanges
+    }
+
+    // print the loaded exchanges per user
+    for (const userId in localExchanges) {
+        console.log ('Loaded', userId, Object.keys (localExchanges[userId]))
+    }
+}
+
+main ()
+ 
+```