node mpd client

Connect to a music player daemon server, send commands, emit events.

You might also be interested in checking out node-groove, a generic music player backend as a node module.

Or maybe Groove Basin, a music player server which supports the MPD protocol and has many features and improvements over MPD.

Usage

import { MpdClient, parseKeyValueMessage } from "@cuadue/mpd";

const client = new MpdClient();

client.onSystem('player', async () => {
  const msg = await client.getStatus();
  console.log('System "player" event, status is now:', msg);
});

client.onSystem('mixer', async () => {
  const msg = await client.getStatus();
  console.log(`Volume changed to ${msg.volume}`);
});

client.on('state', (state) => {
  if (state instanceof Error) {
    console.log(`Something bad happened! ${state}`);
  } else {
    console.log(`State changed to ${state}`);
  }
});


const main = async () => {
  await client.connect({
    port: 6600,
    host: 'raspberrypi.local',
  })

  console.log("MPD Client is connected");

  const playlistinfo = await client.sendCommands([
    'clear',
    ['add', 'https://listen.xray.fm/stream'],
    'play',
    'playlistinfo'
  ]);

  console.log('Playlist file:', parseKeyValueMessage(playlistinfo).file);

  const msg = await client.getStatus();
  console.log('Status', msg);

  while (true) {
    await new Promise<void>(resolve => setTimeout(resolve, 16));
  }
};

main();

Documentation

See also the MPD Protocol Documentation.

Make a new client with const client = new MpdClient().

Functions

client.connect(options)

Connects to the MPD server.

async client.sendCommand(command)

command can be either:

• a string commandName for a command with no arguments, or
• an array [commandName, arg1, ...] for a command with arguments

async client.sendCommands(commandList)

Send multiple commands in one batch

parseKeyValueMessage(msg)

msg: a string which contains an MPD response. Returns an object.

Events

state(arg)

Whenever the state of the client changes. arg is an Error instance, the string connecting or the string ready.

system(systemName)

A system has updated. systemName is one of:

• database - the song database has been modified after update.
• update - a database update has started or finished. If the database was modified during the update, the database event is also emitted.
• stored_playlist - a stored playlist has been modified, renamed, created or deleted
• playlist - the current playlist has been modified
• player - the player has been started, stopped or seeked
• mixer - the volume has been changed
• output - an audio output has been enabled or disabled
• options - options like repeat, random, crossfade, replay gain
• sticker - the sticker database has been modified.
• subscription - a client has subscribed or unsubscribed to a channel
• message - a message was received on a channel this client is subscribed to; this event is only emitted when the queue is empty

Event Helper Functions

client.onReady(callback)

Callback is called when the client is ready to receive commands. This is called again after reconnecting, if there was an error previously.

client.onSystem(name, callback)

Callback is called with no args when the subsystem having name changes.