AppSync now supports invoking Lambda resolvers asynchronously. This simplifies a common challenge in GenAI applications where we had to hand off the call to the LLM to a background function so we can stream the LLM response back to the caller. The post Ap[...]

Having taught thousands of students to build serverless applications via my online courses and workshops, I felt it was time to kick-start an affiliate program to boost sales. Affiliates would receive 50% of the revenue and get a 15% discount code for the[...]

AWS AppSync added support for Lambda authorizers on 30th July 2021 and it made it much easier to implement group-based authorization with 3rd party identity services. Group-based auth with AppSync and Cognito I previously wrote about how you can secure mu[...]

With API Gateway and Lambda, you can handle client errors gracefully by returning a 4xx response. module.exports.handler = async (event) => { // run validation logic return { statusCode: 400 } } This way, we can communicate clearly to the client that ther[...]

In the last post I discussed my preferred approach for modelling multi-tenant applications with AppSync and Cognito. This approach supports the common requirements in these applications, where there are a number of distinct roles within each tenant. This [...]

Thank you to Josh for asking this question on the AppSync Masterclass forum. His original question goes like this: Let’s say I want to add a one-to-many relationship from Profile to a new property called “Tag” (a complex object with “name” and “color” pro[...]

I have been involved with a client project to help the client launch a new social network for university students to engage with each other to do sports. Amongst other things, users can: Arrange activities and ask to join others’ activities (like a basket[...]

I have some exciting news to share with you. That after some initial delays, the AppSync Masterclass is now open for Early Access with 40% launch discount. First of all, thank you so much for your patience, it’s taken us a bit longer than we expected but [...]

I previously wrote about five reasons you should consider AppSync over API Gateway. One thing that API Gateway supports but you can’t do with AppSync out-of-the-box yet is custom domain names. Your shiny new AppSync API is available at XYZ.appsync-api.us-[...]

I have been working with a US client to build a first-of-its-kind app for managing medical consents. It falls under HIPAA compliance and it’s paramount that we do not allow unauthorized access to user data. As part of the app, we have built an admin tool [...]