node.js - Error in importing socket library client side -


i craeting server using express js , when client side want import socket.io.js library error

get http://localhost:3000/ net::err_connection_refused

and when tried access http://localhost:3000/socket.io/socket.io.js error 

cannot /socket.io/socket.io.js

my client side code 

<script src="/socket.io/socket.io.js"></script> <script type="text/javascript">     var socket = io("http://localhost:3000"); </script>


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