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To get a Slack channel webhook URL, open your Slack app’s settings, enable Incoming Webhooks, choose Add New Webhook to Workspace, select a channel, and authorize. Slack then lists the generated URL in the app settings under Webhook URLs for Your Workspace.
Get a webhook URL in Slack app settings
- Open the Slack app management dashboard and create an app, or select an app you already own.
- In the app settings, open Incoming Webhooks and switch Activate Incoming Webhooks on. See Slack’s Incoming Webhooks documentation.
- Select Add New Webhook to Workspace to begin the installation and authorization flow.
- Choose the destination channel and select Authorize. For a private channel, the person authorizing the app must already be a member.
- Return to the app’s settings and copy the URL listed under Webhook URLs for Your Workspace. Slack’s example URLs use the
hooks.slack.com/services/...pattern; an example is not a working credential.
Use OAuth when your app needs to obtain URLs programmatically
If you are building an app that installs into workspaces, request the incoming-webhook scope during OAuth. Slack’s incoming-webhook scope reference explains that this enables incoming webhooks and displays a channel picker during installation. After exchanging the OAuth verification code, read the incoming_webhook object in the response and use its url field. The object also includes the selected channel, channel_id, and configuration_url.
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Send a test message
Post JSON to the generated URL with an HTTP POST request. For example:
POST <your-generated-webhook-url>
Content-type: application/json
{"text":"Hello, world."}If the request succeeds, the message appears in the channel selected during authorization. Slack’s webhook guide also covers richer message formatting, including blocks.
Know what the webhook can and cannot do
- It is a secret. Slack warns: “Your webhook URL contains a secret. Don’t share it online, including via public version control repositories.” Slack says it actively searches for and revokes leaked secrets. Keep the URL out of public repositories, posts, screenshots, and logs. Slack’s security guidance explains the risk.
- It is restricted to its authorized destination. The webhook is associated with its app and configured channel; it cannot post as an arbitrary user or to an unapproved channel. Its app configuration determines the channel, username, and icon, which a webhook request cannot override. See Slack’s webhook documentation.
- It cannot delete messages. Incoming webhooks do not provide a way to delete a posted message. If deletion is required, Slack points developers to the
chat.postMessageAPI method; consult its method documentation for the API’s behavior and requirements.
If the URL is exposed
Treat an exposed URL as compromised. Remove or regenerate it through Slack’s app or workspace configuration, then replace the old value anywhere your integration stores or uses it. Slack’s warning and active revocation policy are the reason to rotate it rather than assume it is still safe.
Quick Recap
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