Subscribe to a Mastodon streaming URL with NodeJS

listen.js

// npm install websocket
var WebSocketClient = require('websocket').client;

var client = new WebSocketClient();

client.on('connectFailed', function(error) {
    console.log('Connect Error: ' + error.toString());
});

client.on('connect', function(connection) {
    
    connection.on('error', function(error) { 
        console.log("Connection Error: " + error.toString()); 
    });
    
    connection.on('close', function() { 
        console.log("Connection closed");
    });
    
    connection.on('message', function(update) {
        
        var status = {};
        
        switch(update.type)
        {
            case "utf8": status = JSON.parse(JSON.parse(update.utf8Data).payload); break;
            default: status = {}; break;
        }
        
        // status is now a Mastodon toot object
        
    });
});

client.connect('wss://...', 'echo-protocol');