Serverless DynamoDB API Boilerplate

Kickstart your Cloud-native and Serverless project in minutes. This is work in progress

About

This repository is a result of many lessons from launching variety of Serverless powered applications to the production. It was created according to many best practices and aims to provide developers a rapid start while also being production-ready.

Features

Written in Typescript, compiled by Webpack using Serverless Webpack plugin. Optimized for huge projects where Out of Memory errors are frequent
Works fully offline thanks to Serverless Offline and DynamoDB Local ran using Docker Compose
Easibly Testable using Jest
Interacts with DynamoDB using DocumentClient and DynamoDB Toolbox
Works with both REST and GraphQL
Managable - To avoid spaghetti code, serverless.yml is divided into logical parts. Functions' code is placed next to their definitions
CORS by default - allows preflight requests to the resource using the OPTIONS method
HTTP API - uses new version of API Gateway which provides costs savings up to 70%

Quick start

Prerequisites:

Serverless Framework
Node.js
Git

Start by pulling this repo using git:

git clone https://github.com/Dynobase/serverless-dynamodb-api-boilerplate

Or using Serverless Framework:

serverless create --template-url https://github.com/Dynobase/serverless-dynamodb-api-boilerplate --path myService

Once ready, install dependencies:

yarn

After that, start the project locally:

docker-compose up -d # To start DynamoDB local

yarn provision-local-table # To provision DynamoDB table locally

yarn dev # Run project locally

# Add item to the table
curl --location --request POST 'localhost:3000/dev' --data-raw '{ "name":"John Doe" }'

Deploying

sls deploy

Adding new function

Create new folder in functions directory. It should contain:

function.yml - function definition in accordance to Serverless Framework contract
function.ts - actual implementation of Lambda function

Optionally:

role.yml - in order to get better control over IAM Role tied to the function, referenced inside function's role property
controller.ts - the best practice is to keep functions as thin as possible. Controllers with injectable dependencies allow that
request_schema.json - request object definition in JSON Schema

Include newly created function in serverless.yml like so:

- ${file(./functions/<new_function_directory>/function.yml)}

Run yarn generate-request-types to generate Typescript types from request JSON Schema
Complete implementation of your function

Viewing DynamoDB Local contents

Apart from using DynamoDB Shell or CLI, you can use Dynobase to view contents of your local tables:

Contributing

Contributions are more than welcome.

Licensing

This project is licensed under the MIT License.