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Javascript on AWS Lambda
How to use Node.js in a serverless architecture
Tamás Sallai
Reduce the time it takes to get up to speed with Lambda from weeks to an afternoon. This technical manual shows you everything you need to successfully develop and deploy AWS Lambda functions written in Javascript. It covers all necessary topics in one place, complete with code examples and linked projects.
The AWS documentation pages are a great place to learn about services, but they are also filled with things that are not relevant, making it hard to get the big picture.
This book has all the important parts, based on experience and a lot of trial-and-error. You'll know everything you need in a fraction of time. No fluff or filler text, but plenty of hands-on examples.
You'll:
* Understand how the Lambda execution environment works
* Learn how to write Javascript serverless functions
* And walk away with knowledge about debuggers and HTTP APIs
I'm an AWS certified security specialist and architect and I've been working with cloud environments for several years now. I've been writing about these topics since 2014 on my blog. With over 150 articles (and counting!), my writing is characterized by the depth of research and a to-the-point style.
Who is this book for?
Software developers who are familiar with Javascript and have some experience with the AWS cloud. The infrastructure examples are in Terraform, so it's nice to have some prior knowledge of that too.
Table of contents
Introduction
Chapter 1: The Lambda execution model
Serverless functions
Limits
The cost model
At-least-once execution
Caching in /tmp
Cold start
Memory
Chapter 2: Setup
Node versions
The Lambda permission model
How to define code
Inline code
File interpolation
Adding packages with npm
Handler argument
Chapter 3: Programming model
Async handler
Async programming patterns
Background tasks
Input and output
The event object
The context object
Output
The AWS SDK
Pagination
Environment variables
Timeout
Cause of timeouts
Mitigating timeouts
AWS SDK timeouts
Promise-based timeout handling
Chapter 4: Debugging
Logging
X-Ray
Custom segments
Chapter 5: Other topics
Storing secrets
Using SSM
Caching
Cache time
HTTP API
OpenAPI backend
Request parameters
Special handlers
Express backend
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