Channel Groups API for PubNub JavaScript SDK

Channel Groups allows PubNub developers to bundle thousands of channels into a group that can be identified by name. These Channel Groups can then be subscribed to, receiving data from the many back-end channels the channel group contains.

Learn more about our Channel Groups here.

Channel Group operations

You can't publish to a Channel Group. You can only subscribe to it. To publish within Channel Group, you need to publish to each channel individually.

Supported and recommended asynchronous patterns

PubNub supports Callbacks, Promises, and Async/Await for asynchronous JS operations. The recommended pattern is Async/Await and all sample requests in this document are based on it. This pattern returns a status only on detecting an error. To receive the error status, you must add the try...catch syntax to your code.

Adding Channels

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

Description

This function adds a channel to a channel group.

Method(s)

Adding Channels is done by using the following method(s) in the JavaScript V4 SDK:

Maximum number of channels

200 channels can be added to the channel group per API call.

pubnub.channelGroups.addChannels({
    channels: Array<string>,
    channelGroup: string
})

Parameter	Type	Required	Description
Operation Arguments	Hash	Yes	A hash of arguments.
channels	Array<string>	Yes	The channel to add to the channel group.
channelGroup	string	Yes	The channelGroup to add the channels to.

Basic Usage

Adding Channels

try {
    const result = await pubnub.channelGroups.addChannels({
        channels: ["ch1", "ch2"],
        channelGroup: "myChannelGroup",
    });
    console.log("operation done!");
    result.channels.forEach(function (channel) {
        console.log(channel);
    });
} catch (status) {
    console.log("operation failed w/ error:", status);
}

Response

{
    error: false,
    operation: "PNAddChannelsToGroupOperation",
    statusCode: 200
}

Listing Channels

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

Description

This function lists all the channels of the channel group.

Method(s)

Listing Channels is accomplished by using the following method(s) in the JavaScript V4 SDK:

pubnub.channelGroups.listChannels({
    channelGroup: string
})

Parameter	Type	Required	Description
Operation Arguments	Hash	Yes	A hash of arguments.
channelGroup	string	Yes	Channel Group to list the channel(s) of.

Basic Usage

Listing Channels

// assuming an intialized PubNub instance already exists
try {
    const result = await pubnub.channelGroups.listChannels({
        channelGroup: "myChannelGroup",
    });
    console.log("Listing push channels for the device");
    result.channels.forEach(function (channel) {
        console.log(channel);
    });
} catch (status) {
    console.log("Operation failed w/ error:", status);
}

Response

// Example of Status
{
    error: false,
    operation: "PNChannelsForGroupOperation",
    statusCode: 200
}

// Example of Response
{
    channels: ["ch1", "ch2"]
}

Removing Channels

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

Description

This function removes the channels from the channel group.

Method(s)

Removing Channels is accomplished by using the following method(s) in the JavaScript V4 SDK:

pubnub.channelGroups.removeChannels({
    channels: Array<string>,
    channelGroup: string
})

Parameter	Type	Required	Description
Operation Arguments	Hash	Yes	A hash of arguments.
channels	Array<string>	Yes	The channel to remove from the channel group.
channelGroup	string	Yes	The channelGroup to remove the channels from.

Basic Usage

Removing channels

// assuming an initialized PubNub instance already exists
try {
    const result = await pubnub.channelGroups.removeChannels({
        channels: ["son"],
        channelGroup: "family",
    });
    console.log("operation done!");
    result.channels.forEach(function (channel) {
        console.log(channel);
    });
} catch (status) {
    console.log("operation failed w/ error:", status);
}

Response

{
    error: false,
    operation: "PNRemoveChannelsFromGroupOperation",
    statusCode: 200
}

Deleting Channel Group

Requires Stream Controller add-on

This method requires that the Stream Controller add-on is enabled for your key in the Admin Portal. Read the support page on enabling add-on features on your keys.

Description

This function removes the channel group.

Method(s)

Deleting Channel Group is accomplished by using the following method(s) in the JavaScript V4 SDK:

pubnub.channelGroups.deleteGroup({
    channelGroup: string
})

Parameter	Type	Required	Description
Operation Arguments	Hash	Yes	A hash of arguments.
channelGroup	string	Yes	The channelGroup to remove.

Basic Usage

Deleting Channel Group

try {
    const result = await pubnub.channelGroups.deleteGroup({
        channelGroup: "family",
    });
    console.log("operation done!");
    result.channels.forEach(function (channel) {
        console.log(channel);
    });
} catch (status) {
    console.log("operation failed w/ error:", status);
}

Response

{
    error: false,
    operation: "PNRemoveGroupOperation",
    statusCode: 200
}