random web3 provider - check if your provider is connected, pick another at random if not and keep trying

random-web3-provider.js

let setupProvider = async () => {
 const endpoints = [
     'https://bsc-dataseed1.defibit.io/',
     'https://bsc-dataseed.binance.org/',
     'https://bsc-dataseed1.ninicoin.io/',
     'https://bsc-dataseed2.defibit.io/',
     'https://bsc-dataseed3.defibit.io/',
     'https://bsc-dataseed4.defibit.io/',
     'https://bsc-dataseed2.ninicoin.io/',
     'https://bsc-dataseed3.ninicoin.io/',
     'https://bsc-dataseed4.ninicoin.io/',
     'https://bsc-dataseed1.binance.org/',
     'https://bsc-dataseed2.binance.org/',
     'https://bsc-dataseed3.binance.org/',
     'https://bsc-dataseed4.binance.org/',
 ]
 
 let endpointsClone
 let isConnected = false
 let web3endpoint
 let web3 = new Web3()

 while (!isConnected) {
     endpointsClone = [...endpoints]
     await new Promise(async (resolve, reject) => {
         try {
             while (!isConnected) {
                 (endpointsClone.length === 0) && (resolve(false))
                 const idx = Math.floor(Math.random() * endpointsClone.length)
                 web3endpoint = endpointsClone.slice(idx, idx + 1)[0]
                 try {
                     await web3.setProvider(web3endpoint)
                     await web3.eth.getBlockNumber()
                     isConnected = web3.currentProvider.connected
                 } catch (err) {
                     console.error(err)
                 }
                 await this.sleep(1000)
             }
             window.web3 = web3
             resolve(true)
         } catch(err) {
             reject(err)
         }
     })
 }
 return web3endpoint
}

console.log('RPC:' (await setupProvider()))

sleep.js

  function sleep(ms) {
        return new Promise((resolve) => setTimeout(resolve, ms))
  }