AWS Lambda REST API using Serverless, Express and Nodejs

Demostrate how to use the popular Node web framework Express.js to deploy a Serverless REST API. This means you can use your existing code + the vast Express.js ecosystem and benefits of Serverless.

Getting Started

Install the serverless-http framework

$ npm install --save express serverless-http

The serverless-http package is a middleware that handles the interface between Node.js express application and the specifics of API Gateway.

Let's create an index.js file that has our application code:

// index.jsconstserverless=require('serverless-http');constexpress=require('express')constapp=express()app.get('/',function(req,res){res.send('Hello World!')})module.exports.handler=serverless(app);

To get this application deployed, let's create a serverless.yml

# serverless.ymlfunctions:
app:
handler: index.handlerevents:
- http: ANY /
- http: 'ANY {proxy+}'

We've created one function, app, which uses the exported handler from our index.js file. Finally, it's configured with some HTTP triggers.

We've used a very broad path matching so that all requests on this domain are routed to this function. All of the HTTP routing logic will be done inside the Express application.