node package manager
Share your code. npm Orgs help your team discover, share, and reuse code. Create a free org »



npm codeship coverage 93.85%

A Slack Web API client 🌱🙌💕

  • Written in modern JavaScript; tested for Node and the browser
  • Complete support for the Slack Web API
  • Perfect symmetry: JS method signatures match Web API docs
  • Choose your async adventure: all methods accept either a Node style errback or return a Promise
  • Opt into an OO style class instance that applies token to all methods
  • Well tested, CI, and Apache2 licensed
  • Only one dependency: tiny-json-http
  • Tiny: 7kb browserified/minified

Install 🌟📦

npm i slack

Usage ✨🚀

slack mirrors the published API docs exactly because its generated from those docs! The default interface are stateless functions and has remain unchanged since 1.0.0 and that will continue to be the case.

var slack = require('slack')
// logs {args:{hello:'world'}}
slack.api.test({hello:'world'}, console.log)
// :new: opt into promises

Due to popular demand an OO style is now supported. For an instance of Slack all methods come prebound with the token parameter applied.

const token = process.env.SLACK_BOT_TOKEN
const Slack = require('slack')
const bot = new Slack({token})
// logs {args:{hyper:'card'}}

Using async/await in Node 8.x:

let token = process.env.SLACK_BOT_TOKEN
let Slack = require('slack')
let bot = new Slack({token})
;(async function main() {
  // logs {args:{hyper:'card'}}
  var result = await bot.api.test({hyper:'card'})

Choose whichever style works best for your project deployment needs and team preference. It is definitely worth examining what style is more concise, expressive and deterministic. It is also worth noticing how these properties can change between runtime versions. ♥️🍺

Error Handling

Some methods (like provide additional context for errors through a response_metadata object. This will be exposed as a messages properties on the errors that are thrown. => {

Test Setup 🔒🔑👈

Clone this repo and create a file called .env in the root with the following:


You can get a SLACK_TOKEN for testing here. You need to register an app for a SLACK_CLIENT_ID and SLACK_CLIENT_SECRET. The tests require the app to have the channels:history scope. You can read about bot tokens here.

Testing 💚💚💚

👉 In Node:

npm test

👉 Or the browser:

npm run btest

Slack Web API 🎉🐝🚩

The entire Slack Web API is supported. All method signatures accept a params object and either a Node style callback (an errback) or, if absent, it will return a Promise. Required params are documented inline below.


The code for the client is generated by scraping the Slack Web API documentation. Regenerate from the latest Slack documentation by running 🏃:

npm run generate

Portions of this README are generated as well; to make edits, update readme.tmpl and run the same command ☁️☔️☀️🌻.