Websocket 8.5 sends `<Buffer>` to server. How to convert data on Server to JSON?-CodePudding

I'm testing websocket connection. I want to send JSON object from client to Server:

const WebSocket = require('ws');
const wss = new WebSocket.Server({port: 8082});

wss.on("connection", (ws) => {
  console.log('server is connected');
  ws.on("message", (mesg) => {
    const a = mesg.toString();
    console.log(a);
  });
  ws.on("close", () => {
    console.log("Client has disconnected!");
  });
});

On the server side: console.log(mesg) returns <Buffer>

console.log(a) returns object Object]

JSON.parse(a) throws error message.

I'm at a loss. What am I doing wrong? Thank you!

CodePudding user response：

Problem is on the client side. You're not serializing your JSON when sending it over the socket.

Add a call to JSON.stringify() on the client before sending, and it should work.

On the server then it's just a matter of using JSON.parse(mesg.toString()) to output the buffer to a string and deserialize the JSON back to an object.