Node.js: how to fix error server error at Socket.onPacket


How to fix Node.js client connect_error:

    Error: server error at Socket.onPacket (socket.io.js:1) 
      at XHR.<anonymous> (socket.io.js:1) 
      at XHR.Emitter.emit (socket.io.js:1) 
      at XHR.Transport.onPacket (socket.io.js:1) 
      at callback (socket.io.js:2) 
      at Object.exports.decodePayload (socket.io-.js:2) 
      at XHR.Polling.onData (socket.io.js:2) 
      at Request.<anonymous> (socket.io-.js:2) 
      at Request.Emitter.emit (socket.io.js:1) 
      at Request.onData (socket.io.js:2)

Main raison is mismatched versions of socket.io in client and server. You can choose the match JS client library at: https://cdnjs.com/libraries/socket.io or use /socket.io/socket.io.js on your server eg: https://ws.tutorialspots.com:31111/socket.io/socket.io.js

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