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Looks like the module that you are using is for the server-side and not the client-side socket.io lib you need. Use the client site script instead. You can just use the <script> tag in your HTML index.html and import the socket.io js file for the client site <script src="/socket.io/socket.io.js"></script> <script> const ...

Your WS path looks good to me it may an issue on the server side. Here's how I build the WS URL on the client side to run on local and Heroku: const wsUrl = (window.location.protocol === 'http:' ? 'ws://' : 'wss://') + window.location.host;