How to OAuth with Slack using Node.js and Express

In this video, you’ll learn how to implement an OAuth flow from scratch to connect a Node.js/Express application to Slack. All of the code samples from this video can be found in this blog post on the same topic: https://knock.app/blog/how-to-authenticate-users-in-slack-using-oauth Knock also has provides a set of UIs and APIs that allow you to manage Slack integrations easily: https://docs.knock.app/integrations/chat/slack-kit/overview If you’re looking for more content on how to integrate Slack with your application, check out these resources: https://knock.app/blog/the-guide-to-slack-markdown https://knock.app/blog/how-to-think-about-slack-as-a-notification-channel Chapters 0:00 - Intro 0:16 - Scaffold the app 1:16 - Import dependencies and bootstrap 3:45 - Explaining step one of OAuth flow 4:40 - Implementing step one of OAuth flow 5:20 - Redirecting the user to Slack 7:55 - Creating our redirect_uri route 8:30 - Getting the code from Slack 8:50 - Explaining step two of OAuth flow 9:40 - Adding error handling 10:45 - Fetching the access token 14:29 - Explaining step three of OAuth flow 15:00 - Using access token to make Slack API requests 15:35 - Storing access token in session 16:55 - Using access token in Authorization header 17:34 - API request error handling 18:25 - Send user channels to browser 19:42 - Start Express server 20:30 - Configuring our Slack app 20:50 - Env variables setup 21:20 - Create Slack app 21:45 - Setting client id and client secret 22:20 - Add OAuth scopes 22:30 - Adding redirect URL 22:42 - Using NGROK 23:35 - Updating redirect URL in .env and Slack 24:15 - Start Express server 24:30 - Test OAuth flow in browser 25:08 - Outro