How to Create a WebSocket API using Amazon API Gateway and AWS Lambda - full tutorial

Want a job as a Serverless Software Engineer?

In this in depth video we'll be be learning how to set up a Websocket endpoint. Websockets allow users to connect and then either party to send messages at any point. This is great for notification systems, messaging platforms and much more.

This is the repo to start the lesson

This is the repo of the complete code

[MubashirAR]

Thank you!! I'm doing a demo tomorrow in my company on serverless and this was the only resource I found that explained the setup of websockets with API Gateway and Lambda so well. Finally, my demo is complete. Keep the amazing videos coming! :)

[aarondavidge]

These are literally the best coding instructional on the NET!!! Awesome you use the CLI for everything were as every of instructional use the GUI. If you subscribe and follow along you will not be disappointed.

[jayraldempino]

I'm still a student and this really really helps me a lot. Thank you!

[chrisclark]

You absolute hero; really helpful and concise tutorial!

[rachellejanssen]

Dude, this is such a nice tutorial! I'm excited to see your other videos!

[samgoldmann]

Nice production value. Great tutorial. Thank you.

[fedelecavaliere]

Your explanations are so comprehensive and understandable! Sub

[rajatmasih]

Amazing tutorial. Its very easy to learn and job

[diegomarzo]

Super well explained, thank you very much for such a nice piece of work!!

[mahdadghasemian]

Thank you!! There is a sight change in newer version regarding postParams. it should be like this "ConnectionId" with capital C
const postParams = {
Data: message,
ConnectionId: connectionID
}

[yasirkaram]

Very concise n clear, what makes next worth is to do Front-End full stack app with hybrid framework

[warrior-kas]

I am thankful for your videos and they taught me so much . I had great experience on aws but i was not fan of serverless yaml file because of some small indentation it causes huge problem .However you made it so easy for me and i feel comfortable now to write api in serverless rather than deploying in console aws

[boughanmi]

Awesome tutorial.
It would be great if you add a section about integration of a costum authorizer for the $connect route

[francoisvT]

Nice tool, websocket.org, I usually use an npm package called wscat, where you can connect and test your socket connections in terminal on your local machine. Good tutorial, got some nice serverless tips for websockets here thanks.

[leandrocorrea]

Thanks a lot bro, I remember you were going to notify me when you upload this video. Anyways, great video!

[wagnerperin]

Excellent video! Congratulations.

I found a typo in the code of the websocketMessage.js file. In connectionId, C is capitalized. The correct one would be ConnectionId in postParams object.

[shuvo]

Hi, thanks for the tutorial. I've one query. I'm working on a calling application. When one user starts a call to connect with some other user, only the other user will be get notified in the frontend app if the user is logged in. How can I achieve this with this WebSocket?

[krishnamadina]

please explain the configuration of aws and serverless framework and dynamo db

[nirgluzman]

Great tutorial!
What I find a bit weird in the code, that you use Responses._200({...}) as part of the websocket protocol. It looks like you're mixing HTTP and WS.

[dustinv]

Great tutorial. I just have a quick question, is it possible to test locally without deploying these functions to aws lambda.? Afaik, y can use postman to test for the rest api, but not sure if we can use something to test for the websocket