Even simpler integration with Slack's Incoming and Outgoing webhooks
Clone or download


Slack.Webhooks Build status NuGet Version

Even simpler integration with Slack's Incoming/Outgoing webhooks API for .net

*** v1.0.0 BREAKING CHANGES ***

We no longer use RestSharp in favour of HttpClient - this however means that .NET 4.0 and below are no longer supported.

Also, the PostAsync method signature has changed. The return type is now Task<bool> in place of Task<IRestResponse> which was tied directly to RestSharp.

Outgoing Webhooks

Blog Post

Incoming Webhooks


  1. You must first enable the Webhooks integration for your Slack Account to get the Token. You can enable it here: https://slack.com/services/new/incoming-webhook
  2. Slack.Webhooks depends on JSON.net
  3. Compatible with .NET 4.5+ and .NET Core. If you need .NET 3.5/4 you can use an older release, but this may be out of date.


Package is hosted on Nuget and can be installed from the package manager:

PM> Install-Package Slack.Webhooks

For older .NET framework support:

PM> Install-Package Slack.Webhooks -Version 0.1.8

Then, create a SlackClient with your Webhook URL.

var slackClient = new SlackClient("[YOUR_WEBHOOK_URL]");

Create a new SlackMessage

var slackMessage = new SlackMessage
    Channel = "#random",
    Text = "Your message",
    IconEmoji = Emoji.Ghost,
    Username = "nerdfury"

By default the text can contain Markdown but this default behaviour can be disabled:

slackMessage.Mrkdwn = false;

More info on message formatting can be found in the Docs

Attachments can be added to a message:

var slackAttachment = new SlackAttachment
        Fallback = "New open task [Urgent]: <http://url_to_task|Test out Slack message attachments>",
        Text = "New open task *[Urgent]*: <http://url_to_task|Test out Slack message attachments>",
        Color = "#D00000",
        Fields =
            new List<SlackField>
                    new SlackField
                            Title = "Notes",
                            Value = "This is much *easier* than I thought it would be."
slackMessage.Attachments = new List<SlackAttachment> {slackAttachment};

Please see the Docs for further info on attachments.

And Post it to Slack