Q: How to use bolt-js with Cloudflare Workers or Netlify functions?

[ClydeDz]

Description

Hi,

I'm learning and experimenting with Slack API using Bolt JS and I'm really liking the experience so far. I was trying to integrate bolt.js with Netlify functions and Cloudflare Workers but it doesn't seem to work well. I believe it is to do with implementing the receiver to intercept

The Cloudflare Workers examples page shows various code snippets all with the following code as the entry point.

addEventListener("fetch", event => {
}

The Netlify functions examples page shows various code snippets all with the following code as the entry point, very similar to the Cloudflare Workers example.

exports.handler = function(event, context, callback) {
}

I was trying to implement bits from this example but it perhaps conflicts with the Netlify and Cloudflare lifecycle.

Is there a way to attach bolt's /slack/events listener another way or somehow pass the payload received from the above code snippets into a function to 'parse' and then continue using bolt's app listener events (convenience methods)?

Thanks!

---

What type of issue is this? (place an x in one of the [ ])

• bug
• enhancement (feature request)
• question
• documentation related
• example code related
• testing related
• discussion

Requirements (place an x in each of the [ ])

• I've read and understood the Contributing guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.
• I've searched for any related issues and avoided creating a duplicate issue.

[seratch]

Hi @ClydeDz, thanks for asking the question!

Honestly, I don't have much experience with these platforms yet but let me share information as much as possible I can.

Cloudflare Workers

As there is no out-of-the-box support for the platform yet, you may need to write your own receiver for Cloudflare Workers as the HTTP interface is compatible with neither Express.js or Node.js's HTTP module.

https://developers.cloudflare.com/workers/get-started/guide#5-write-code

Probably, a simple receiver should work but I’ve never tried it out yet. Also, I'm unsure that it smoothly works on the platform as the runtime in the platform is V8. Bolt for JS is supposed to be used in the Node runtime. You may encounter some issues specific to the V8 runtime.

Netlify Functions

An easy way seems to be deploying an Express app: https://www.netlify.com/blog/2018/09/13/how-to-run-express.js-apps-with-netlify-functions The easiest way would be going with the built-in ExpressReceiver. Perhaps, the HTTPRecevier (the default one) should work as well.

If you have questions specific to these platforms, I would recommend their community or forums. You'll be able to get more relevant answers from the platform experts there.

I hope this was helpful to you. If everything is clear, would you mind closing this issue?

[ClydeDz]

Hi, @seratch, thanks for replying and for pointing me in the right direction. I'll check out those links and take it from here. Thank you!

[jacobycwang]

In case anyone needs it, I drafted a Cloudflare receiver with Gemini 2.5, and it seems to work.

#2510