Why Automate GitHub to Slack?

Development teams live in two places: their code repository and their messaging tool. When these two systems don't talk to each other automatically, important updates get missed, reviews are delayed, and context-switching increases. Connecting GitHub to Slack via Zapier takes about 15 minutes and eliminates a whole class of manual check-ins.

What You'll Need

  • A GitHub account with access to the target repository
  • A Slack workspace where you have permission to add apps
  • A free Zapier account (the free tier supports this automation)

Step-by-Step: Setting Up the Zap

Step 1: Create a New Zap

Log into your Zapier account and click "Create Zap". Zapier uses a Trigger → Action model. You'll set GitHub as the trigger and Slack as the action.

Step 2: Configure the GitHub Trigger

  1. Search for and select GitHub as the trigger app.
  2. Choose a trigger event. Common options include:
    • New Pull Request — fires when a PR is opened.
    • New Issue — fires when an issue is created.
    • New Commit — fires on each new commit to a branch.
    • Pull Request Review Request — fires when a review is requested.
  3. Connect your GitHub account by authorizing Zapier via OAuth.
  4. Select the specific repository you want to monitor.
  5. Test the trigger — Zapier will fetch a recent event to confirm the connection works.

Step 3: Configure the Slack Action

  1. Search for and select Slack as the action app.
  2. Choose the action event: "Send Channel Message" is the most common choice.
  3. Connect your Slack workspace via OAuth.
  4. Choose the channel where notifications should appear (e.g., #dev-alerts or #pull-requests).
  5. Compose the message using dynamic data from GitHub. For example:
    • Message text: "🔔 New PR by [GitHub Username]: [PR Title] — [PR URL]"
  6. Optionally, set the bot name and icon to make messages recognizable.

Step 4: Test and Activate

Run the test to send a sample message to your Slack channel. Verify the formatting looks right, then click "Publish Zap" to activate it.

Useful Variations to Build Next

  • PR merged notification: Trigger on closed PRs where merged = true, post to a #releases channel.
  • Failed CI alert: Use GitHub Actions webhook + Zapier to alert on failed build status checks.
  • Daily digest: Use Zapier's "Digest" feature to batch all GitHub activity into a single daily Slack summary instead of individual messages.
  • Assign reviewer reminder: When a PR has been open for more than 24 hours without a review, send a reminder message.

Alternatives to Zapier

If you prefer not to use Zapier, consider these alternatives:

  • GitHub's native Slack integration: Available via the Slack App Directory — provides basic notifications without any third-party tools.
  • Make (formerly Integromat): More flexible for complex multi-step workflows.
  • n8n: Open-source and self-hostable, ideal if you want full control of your automation stack.

Final Thoughts

Automating GitHub-to-Slack notifications is one of the highest-ROI automations a development team can set up. It takes minimal time to configure, reduces the need for manual standup updates, and keeps everyone aligned on repository activity without adding to anyone's notification fatigue.