Luis  Rodrigues

Luis Rodrigues


AWS API Gateway & AWS Lambda - AWS Serverless - Part II

In this AWS API Gateway tutorial as we use API Gateway to create a REST API ‘front door’ for our AWS Lambda and DynamoDB backend.

Included topics:

  1. Create REST endpoints using AWS API Gateway
  2. Integrate AWS API Gateway with AWS Lambda function
  3. AWS Lambda integration with AWS DynamoDB
  4. Test API Gateway REST endpoints

Link to API Gateway models documentation:…

Completed tutorial code:…


#aws #lambda #serverless

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AWS API Gateway & AWS Lambda - AWS Serverless -  Part II
Ryan  Schneider

Ryan Schneider


Serverless Express – Easy APIs On AWS Lambda & AWS HTTP API

TLDR - Take existing Express.js apps and host them easily onto cheap, auto-scaling, serverless infrastructure on AWS Lambda and AWS HTTP API with Serverless Express. It’s packed loads of production-ready features, like custom domains, SSL certificates, canary deployments, and costs ~$0.000003 per request.

If you simply want to host a common Express.js Node.js application, have it auto-scale to billions of requests, and charge you only when it’s used, we have something special for you…

Announcing Serverless Express, a Serverless Framework offering enabling you to easily host and manage Express.js applications on AWS Lambda and the new AWS HTTP API, which is 60% faster and 71% cheaper than their initial API Gateway product.

Serverless Expess is a pure Express.js experience and it’s perfect for those that want to focus on apps, not infrastructure complexity.

Here are the highlights:

  • Easy, Safe, Performance - Includes the optimal infrastructure pattern for cost, performance & scale.
  • Never Pay For Idle - No API requests? No cost. Averages ~$0.000003 per request.
  • Zero Configuration - Add your Express app, then deploy (advanced config options are available).
  • Fast Deployments - Deploy changes to the cloud in seconds.
  • Real-time Logging - Rapidly develop on the cloud w/ real-time logs and errors in the CLI.
  • Canary Deployments - Deploy your app gradually to a subset of your traffic.
  • Custom Domain + SSL - Auto-configure a custom domain w/ a free AWS ACM SSL certificate.
  • Team Collaboration - Collaborate with your teamates with shared state and outputs.

Here is how to get started and deliver a Serverless Express.js based API with a custom domain, free SSL certificate and much more! You can also check out our Serverless Fullstack Application boilerplate, which includes Serverless Express in a real-world example that features a database, website using React and more.


Serverless Express is a Serverless Framework Component (i.e premium experiences for popular serverless use-cases) and you’ll need to install Node.js and the Serverless Framework CLI to use it.

Install Node.js here.

Then run this command to install Serverless Framework.

npm i -g serverless

Next, install the Serverless Express template:

serverless create --template-url

Lastly, Serverless Express deploys onto your own Amazon Web Services account, so you’ll need Access Keys to an AWS account you own. Follow this guide to create those.

After you have created AWS Access Keys you can add them directly to an .env file, or reference an AWS Profile in a .env file, within the root of the template you installed.


You can also reference an AWS Profile in a .env file like this.


If you don’t include a .env file, the Serverless Framework will automatically look for a default AWS Profile in the root folder of your machine.

Also, Serverless Framework has a built-in stages concept. If you change the stage it will deploy a totally separate copy of your serverless application.

# serverless.yml
component: express@1.0.8
  name: express-api
  stage: prod

Even better, you can use different .env files for each stage by simply using this convention:

.env # all stages # "dev" stage # "prod" stage

One last—often overlooked—step is to install the Express.js dependency, by running npm i in the template.

#serverless #apis #aws #aws lambda #aws http api

Anissa  Barrows

Anissa Barrows


AWS API Gateway + Lambda /w TypeScript

AWS API Gateway + Lambda /w TypeScript

#aws api #api gateway #api #aws #typescript #lambda

Build a Serverless API with AWS Gateway and Lambda

APIs are a crucial part of any web application and there are different techniques for development and design. Serverless is one approach gaining popularity, because of its cost-efficiency, scalability and relative simplicity. As a leading serverless provider, Amazon Web Services (AWS) has made a huge contribution to the world of serverless development, and in this article, we will explain general API implementation concepts using AWS Lambda and other AWS services.

Why AWS Lambda?

AWS Lambda is an AWS service that is responsible for running particular functions in response to particular triggers — events happening in the application. Those triggers could be HTTP calls; events from other AWS services like S3, Kinesis, or SNS; or just recurrent scheduled events. Functions are executed in some type of ephemeral containers, which are fully provisioned and scaled by AWS, so the development team can focus more on the code and functionality than on infrastructure.

Another attractive feature is the pay-as-you-go payment model, where you are charged only for the total execution time of your functions and do not pay for idle time. Of course, like any other service, Lambda has limits and is sometimes not suitable for certain tasks — such as very long-running jobs, heavy computing jobs, or processes that require control over the execution environment. However, AWS Lambda usually works perfectly for implementing APIs.

The Role of API Gateway

AWS API Gateway is a service allowing developers to create and manage HTTP endpoints, map them to particular AWS resources, and configure custom domains, authorizing mechanisms, caching and other features. API Gateway is the fundamental part of serverless API, because it is responsible for the connection between a defined API and the function handling requests to that API.


As mentioned, API Gateway includes a lot of functionality and integrations. At some point, though, Amazon realized that serverless developers usually do not require all of those features, but instead need a general simplification of the implementation process. That is probably why in late 2019, AWS announced the new HTTP APIs, a lite version of API Gateway, which dramatically simplifies the developer experience and provides better performance and lower costs for serverless APIs. Although it is simple, HTTP APIs still support such important features as configuring CORS for all endpoints, JWT integration, custom domains and VPC connections.

Understanding Serverless API Concepts

In order to easily understand the main concepts of serverless API implementation, we’ll build a very minimalistic example of a simple “virtual whiteboard” application, consisting of two simple endpoints: POST for writing messages on a whiteboard, and GET for fetching the three most recent messages. We will also consider other possible features — like path parameters, CORS, and authorizers — but we’ll keep the final implementation simple and clear to read.

AWS DynamoDB

We will make our project completely serverless, by using AWS DynamoDB for storing messages. This database corresponds to serverless principles, is easy to use, and offers a pay-per-request model that is really cost-effective. DynamoDB is a NoSQL key-value database offered by AWS, where your data is stored across AWS servers and fully managed by Amazon.

AWS Serverless Application Model

In order to continue further implementation, you’ll need an AWS account and AWS Serverless Application Model (SAM) installed and configured. SAM is a tool for creating, updating, and managing serverless applications and all the resources needed for the application to operate. With AWS SAM, you don’t need to create every single service manually via web console, but just to describe all the things needed in the special template file.

After you’ve installed the CLI, navigate to the directory you are going to work in and run this command:

$ sam init -r nodejs12.x -n whiteboard

Initializing new project

Select the first option, then select “Quick Start from Scratch.” This will create a “whiteboard” directory with a minimum of setup files inside.

#api management #aws #api #lambda #aws gateway #amazon web services

Gordon  Matlala

Gordon Matlala


Serverless Proxy with AWS API Gateway and AWS Lambda

It’s sometimes difficult to communicate between public and private subnet in AWS.

We will see how we can easily do that with the help of API Gateway and AWS Lambda.

Use case example

Example 1

It’s sometimes necessary to have a Github repository communicating with a private EC2 instance.

But when an instance is private, it can be really complicated without impacting the security of the instance.

#aws-lambda #serverless #api-gateway #aws

Christa  Stehr

Christa Stehr


How To Unite AWS KMS with Serverless Application Model (SAM)

The Basics

AWS KMS is a Key Management Service that let you create Cryptographic keys that you can use to encrypt and decrypt data and also other keys. You can read more about it here.

Important points about Keys

Please note that the customer master keys(CMK) generated can only be used to encrypt small amount of data like passwords, RSA key. You can use AWS KMS CMKs to generate, encrypt, and decrypt data keys. However, AWS KMS does not store, manage, or track your data keys, or perform cryptographic operations with data keys.

You must use and manage data keys outside of AWS KMS. KMS API uses AWS KMS CMK in the encryption operations and they cannot accept more than 4 KB (4096 bytes) of data. To encrypt application data, use the server-side encryption features of an AWS service, or a client-side encryption library, such as the AWS Encryption SDK or the Amazon S3 encryption client.


We want to create signup and login forms for a website.

Passwords should be encrypted and stored in DynamoDB database.

What do we need?

  1. KMS key to encrypt and decrypt data
  2. DynamoDB table to store password.
  3. Lambda functions & APIs to process Login and Sign up forms.
  4. Sign up/ Login forms in HTML.

Lets Implement it as Serverless Application Model (SAM)!

Lets first create the Key that we will use to encrypt and decrypt password.

    Type: AWS::KMS::Key
      Description: CMK for encrypting and decrypting
        Version: '2012-10-17'
        Id: key-default-1
        - Sid: Enable IAM User Permissions
          Effect: Allow
            AWS: !Sub arn:aws:iam::${AWS::AccountId}:root
          Action: kms:*
          Resource: '*'
        - Sid: Allow administration of the key
          Effect: Allow
            AWS: !Sub arn:aws:iam::${AWS::AccountId}:user/${KeyAdmin}
          - kms:Create*
          - kms:Describe*
          - kms:Enable*
          - kms:List*
          - kms:Put*
          - kms:Update*
          - kms:Revoke*
          - kms:Disable*
          - kms:Get*
          - kms:Delete*
          - kms:ScheduleKeyDeletion
          - kms:CancelKeyDeletion
          Resource: '*'
        - Sid: Allow use of the key
          Effect: Allow
            AWS: !Sub arn:aws:iam::${AWS::AccountId}:user/${KeyUser}
          - kms:DescribeKey
          - kms:Encrypt
          - kms:Decrypt
          - kms:ReEncrypt*
          - kms:GenerateDataKey
          - kms:GenerateDataKeyWithoutPlaintext
          Resource: '*'

The important thing in above snippet is the KeyPolicy. KMS requires a Key Administrator and Key User. As a best practice your Key Administrator and Key User should be 2 separate user in your Organisation. We are allowing all permissions to the root users.

So if your key Administrator leaves the organisation, the root user will be able to delete this key. As you can see **KeyAdmin **can manage the key but not use it and KeyUser can only use the key. ${KeyAdmin} and **${KeyUser} **are parameters in the SAM template.

You would be asked to provide values for these parameters during SAM Deploy.

#aws #serverless #aws-sam #aws-key-management-service #aws-certification #aws-api-gateway #tutorial-for-beginners #aws-blogs