import socket
import json

def handle_client(client_socket):
    # Receive the data from the client.
    data = client_socket.recv(1024)

    # Decode the data as JSON.
    json_data = json.loads(data.decode())

    # Process the JSON data.
    print(json_data)

    # Send a response to the client.
    response = json.dumps({"message": "Hello, world!"})
    client_socket.sendall(response.encode())

def main():
    # Create a socket.
    server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

    # Bind the socket to a port.
    server_socket.bind(("localhost", 8080))

    # Listen for incoming connections.
    server_socket.listen(1)

    while True:
        # Accept an incoming connection.
        client_socket, _ = server_socket.accept()

        # Handle the client connection.
        handle_client(client_socket)

if __name__ == "__main__":
    main()