Send a success/error message to your Slack group

Create an Incoming WebHook and export this as SLACK_URL. Can send a message to #channel (by default), a direct message to @username or a message to a private group group with success (green) or failure (red) status.

Supported platforms ios, android, mac
Author @KrauseFx

2 Examples

slack(message: "App successfully released!")
  message: "App successfully released!",
  channel: "#channel",  # Optional, by default will post to the default channel configured for the POST URL.
  success: true,        # Optional, defaults to true.
  payload: {  # Optional, lets you specify any number of your own Slack attachments.
    "Build Date" =>,
    "Built by" => "Jenkins",
  default_payloads: [:git_branch, :git_author], # Optional, lets you specify an allowlist of default payloads to include. Pass an empty array to suppress all the default payloads.
        # Don't add this key, or pass nil, if you want all the default payloads. The available default payloads are: `lane`, `test_result`, `git_branch`, `git_author`, `last_git_commit`, `last_git_commit_hash`.
  attachment_properties: { # Optional, lets you specify any other properties available for attachments in the slack API (see
       # This hash is deep merged with the existing properties set using the other properties above. This allows your own fields properties to be appended to the existing fields that were created using the `payload` property for instance.
    thumb_url: "",
    fields: [{
      title: "My Field",
      value: "My Value",
      short: true


Key Description Default
message The message that should be displayed on Slack. This supports the standard Slack markup language
pretext This is optional text that appears above the message attachment block. This supports the standard Slack markup language
channel #channel or @username
use_webhook_configured_username_and_icon Use webhook's default username and icon settings? (true/false) false
slack_url Create an Incoming WebHook for your Slack group
username Overrides the webhook's username property if use_webhook_configured_username_and_icon is false fastlane
icon_url Overrides the webhook's image property if use_webhook_configured_username_and_icon is false
payload Add additional information to this post. payload must be a hash containing any key with any value {}
default_payloads Remove some of the default payloads. More information about the available payloads on GitHub
attachment_properties Merge additional properties in the slack attachment, see {}
success Was this build successful? (true/false) true
fail_on_error Should an error sending the slack notification cause a failure? (true/false) true
link_names Find and link channel names and usernames (true/false) false

* = default value is dependent on the user's system


To show the documentation in your terminal, run

fastlane action slack


It is recommended to add the above action into your Fastfile, however sometimes you might want to run one-offs. To do so, you can run the following command from your terminal

fastlane run slack

To pass parameters, make use of the : symbol, for example

fastlane run slack parameter1:"value1" parameter2:"value2"

It's important to note that the CLI supports primitive types like integers, floats, booleans, and strings. Arrays can be passed as a comma delimited string (e.g. param:"1,2,3"). Hashes are not currently supported.

It is recommended to add all fastlane actions you use to your Fastfile.

Source code

This action, just like the rest of fastlane, is fully open source, view the source code on GitHub

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