Socket server and client in node js.

client.js

const net = require('net');

const sendMessage = (port, message) => {
    return new Promise((resolve, reject) => {
        const client = net.createConnection(port, () => {
            try {
                console.log('Sending message', message)
                const messageSerialized = JSON.stringify(message)
                client.write(messageSerialized)
            }
            catch (err) {
                reject(err)
            }
        }).on('error', err => {
            reject(err)
        })

        client.on('data', (data) => {
            try {
                const response = data.toString()
                const responseUnserialized = JSON.parse(response)

                console.log('Response received', responseUnserialized)
                client.end()

                resolve(response)
            }
            catch (err) {
                reject(err)
            }
        })
    })
}

server.js

const net = require('net');


const server = net.createServer(socket => {
    socket.on('data', data => {
        try {
            const dataSerialized = data.toString()
            console.log('Data received', dataSerialized)

            const responseSerialized = handleMessage(dataSerialized)
            console.log('Sending response to client', responseSerialized)
            
            socket.write(responseSerialized)
            socket.end()
        }
        catch (err) {
            console.error(err)
        }
    })
}).on('error', err => {
    console.error('Could not initialize server.', err)
})

const handleMessage = data => {
    const jsonData = JSON.parse(data)

    // consume json data, send response
   
    const response = {
        'status': 0,
    }
    const responseSerialized = JSON.stringify(response)
    return responseSerialized
}

server.listen(1626, () => {
    console.log('Unity server listenting on', server.address().port);
})