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Node.js Chat App to SMS


David Davis

Summary: This is a how-to Node.js chat app to SMS using Twilio API. Feel free to jump to the repo to get you started.

So I recently was looking to integrate a chat app for a small business client. I knew they wouldn’t want to budget a third party app like Intercom, and so I searched for something simple; I just wanted a chat app on the client’s website that would SMS my client’s phone. I admittedly didn’t do an in depth search, but from what I found it seemed most 3rd party applications charge $15/month on the low end to accomplish this. Knowing this isn’t a very complex application I set out to build what I needed.

The only real limiting factor from what I found when trying to ping a mobile carrier is that you can’t just send an RPC from Node.js without sending it from an SMS number. And thankfully Twilio has a solution you can use called Programmable SMS. To get started, you must purchase a number through them, and by default they give you a number with a random area code. At the end of the day, when you get your app up and running, it’s really pennies on the dollar to use the Twilio service, and for a small company this beats paying a 3rd party app a monthly $15.

First, where to host this code? Well, you need a place that allows persistant connections. I’m a fan of, but they don’t support persistant connections that is needed with websockets. Because I used to work for Google I’m a fan of Google Cloud Platform, and so Cloud Functions won’t work, App Engine does allow persistant connections. Easy enough, BUT, after only a month of running this app on App Engine, I got a bill for ~$150. WHAAAAAT! Yeah, the open socket connection outgoing calls from the server meant I was getting charged 24 hours a day. Screw that obviously, I got a small business to run. So I jumped over to Heroku, and luckily they don’t charge an arm and a leg for this service. I recommend using Heroku.

Enough background, here’s what your app should look like when your done:

I’ve implimented the following using react chat UI called react-chat-window. You can also use react-chat-widget. Both are minimalist UIs and both are great. The code for react-chat-window looks like this:

The above front-end code can live anywhere, I’m using But for the backend code that’s on Heroku, and that code looks like this:

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