A full-featured MQTT client for your browser

In one of the last blog posts, we took a closer look on the available MQTT client tools out there. While these all of these tools work great, they have a drawback in common: You need to download and install them. Some they don’t work on all operating systems. And others don’t support all MQTT 3.1 features like username/passwords.

We are proud to present a MQTT client which implements all MQTT 3.1 features and which runs on any operating system. Introducing the HiveMQ Websockets Client.

This client runs on any modern browser (sorry Internet Explorer <10!) and you can use it to publish and subscribe at the same time. Under the hood it leverages the awesome Eclipse Paho Javascript library for MQTT and Zurbs Foundation as CSS framework.

This web client works perfectly with any HiveMQ MQTT broker with websockets enabled.
Now let’s take a closer look on the features of the web client:

Connecting the client

Connecting with mqttdashboard.com

Connecting with mqttdashboard.com

You can connect to any HiveMQ (even a broker running on localhost!) with all the MQTT 3.1 features you want to use like Last Will and Testament and Username/Password. It’s of course possible to use secure websockets which use SSL to encrypt your traffic.


A few subscriptions

A few subscriptions

You can subscribe to any number of topics you want. Topic wildcards are fully supported. All topics subscriptions are marked with a color of your choice to differentiate the incoming messages on that topic subscription. When clicking the “X” on a topic subscription, you can unsubscribe from the topic.

Incoming messages

Incoming messages

Incoming messages appear in the “Messages” panel and contain all relevant information about the publish like Quality of Service, topic and a timestamp.


Publishing via the web client

Publishing via the web client

The web client supports publishing of messages with all characteristics a MQTT publish can have like Quality of Service and the retain flag.

Try it out yourself

Click here to use the online version of the HiveMQ Websocket client. If you don’t like to use a self hosted (or locally running) HiveMQ, you can use the MQTTDashboard.

Host: broker.mqttdashboard.com
Websockets port: 8000

The source code is available on Github here. Tell us in the comments if you like the idea of a portable MQTT client for the browser which uses kick-ass technology like websockets or drop us a line via e-mail!


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  2. Andy Piper says:

    “The source code will be available on Github very soon” – *bump* :-)

  3. Hey Andy,

    you can find the source code of the HiveMQ MQTT websocket client here: https://github.com/hivemq/hivemq-mqtt-web-client :)

    1. Chandan says:

      Sorry for asking very basic question. i downloaded the example from github. Please let me know how to run it in my machine

    2. Chandan says:

      The connection to ws://broker.mqttdashboard.com:8000/mqtt was interrupted while the page was loading.

      I clicked on connect

      broker.mqttdashboard.com with Port 8000
      clientId-NHlt4GJ1uy but it failed

    3. Are you running a modern browser like Chrome or Firefox? If you’re using an old Internet Explorer version, websockets won’t work :(

      Another possibility would be that port 8000 is blocked by your corporate firewall. Could that be the case?

      Dominik from the HiveMQ Team

    4. Chandan says:

      Hello Team,

      I am using modern browser. i tested in both chrome as well as firefox but didnt worked. :(
      Corporate firewall might be an issue

    5. Chandan says:


      What is the alternate solution to make it work inside a corporate firewall.
      I am desperately need to connect to mqtt broker. Please provide a solution :(

    6. Chandan says:

      Hello Team,

      What could be an alternate solution to overcome the corporate firewall blockage to make hivemq broker work inside a corporate network. Please suggest

    7. Hi Chandan,

      well, the easiest way would be to connect to a MQTT broker installed on your computer and try with “localhost”. I would suggest to talk to your corporate infrastructure team to figure out what your options are. Maybe a broker running on port 80 would help? SOCKS5 may also be an option.

      Dominik from the HiveMQ Team

  4. Zack says:

    Great works!
    I just use it for developing our MQTT-based application dev site(for debugging or something).

    Keep going! Thanks!

  5. samir says:


    Your websocket mqtt client is great. Thank you.
    I think there is a small implementation error in the PUBREL apdu byte 1 – bit 1 should be set to 1 instead of 0.
    Could you confirm please ?

    Bravo !

    1. Hi Samir,

      the websocket client uses the Paho Javascript websocket client and this is probably an error in this upstream dependency. Does upgrading to a more recent version solve the issue for you?

      Dominik from the HiveMQ Team

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