Working with the Slack API in Node.js - In this article, I'll explain the basics of how to send a Slack message from Node.js. There are two npm modules that I recommend for working with the Slack API. Here's how you can use Node.js to send messages to Slack.
Integrating with the Slack API is becoming an increasingly common task. Slack is the de facto communication platform for many companies, so there's a lot of demand for getting data from Node.js apps to Slack in realtime. In this article, I'll explain the basics of how to send a Slack message from Node.js.
There are two npm modules that I recommend for working with the Slack API: the official
@slack/web-api module and the slack module written primarily by Brian LeRoux of WTFJS fame. I've also used node-slack in the past, but that module is fairly out of date. However, both
slack are fairly thin wrappers around the Slack API, so, for the purposes of this article, we'll just use axios.
In order to make an API request to Slack, you need a Slack token. There are several types of Slack token, each with its own permissions. For example, an OAuth token lets you post messages on behalf of a user. But, for the purposes of this article, I'll be using bot user tokens. Bot user tokens let you post messages as a bot user, with a custom name and avatar, as opposed to as an existing user.
In order to get a bot user token, you first need to create a new Slack app. Make sure you set "Development Slack Workspace" to the Slack Workspace you want to use.
Next, go through the steps to create a bot user. You'll have to add scopes (permissions) to your bot user, and then install your app. First, make sure you add the following scopes to your bot user:
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