The way we build software has changed stupendously from Monolithic Architecture (MLA) using single programming language to a Microservices Architecture (MSA) where pieces of code developed in multiple different programming language that fits the problem in hand. Microservice has numerous benefits and encourages Single Responsibility Principle (SLP) with quick deployment and easy to change lifecycle without impacting the fatty software.
AWS offers easy way to implement microservices through RESTful APIs wrapped against AWS Lambda functions in a server less backend that can auto scale with built in security via its IAM. AWS offers 12 months free tier which enable you to get hands-on experience with AWS Cloud Services.
To demonstrate the power of AWS API Gateway & Lambda, I quickly dropped my flicker photo search node.js code as lambda function wrapped in AWS API Gateway and exposed it as REST API Endpoint.
AWS lambda does not support 3rd party npm so make sure to upload all of your 3rd party node_modules. AWS Lambda & API Gateway Getting Started guide will be your good head start.
API END POINT