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JavaScript websocket.emit TypeError: socket.emit is not a function

I would like to emit special event from client side to server. I created a code like this :

const socket = new WebSocket('ws://localhost:9090');

let set_nickname = message => {
    socket.emit ("type-event",message)
}

It throws an error:

Uncaught TypeError: socket.emit is not a function

I couldn't find a solution due to this problem (I'm not sure if emit is even implemented in websocket, I couldn't find a method in a specification, but webstorm suggests that I could use this).

about 4 years ago · Juan Pablo Isaza

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Accepted Answer · 2022-07-04T00:47:12.214Z

The .emit() is a part of Socket.IO but you are using WebSocket API in a browser that uses .send() to emit data to server.

const socket = new WebSocket('ws://localhost:9090');

socket.send("Hello server!");

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JavaScript websocket.emit TypeError: socket.emit is not a function

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