lambda_rest_api: A JavaScript repository from maoyalu

Install the serverless framework
```
npm install -g serverless
```
Configure AWS IAM keys

Replace [Access key ID] and [Secret access key] with your IAM credentials. If you don't have it, create one in the AWS console, My Security Credentials.
```
serverless config credentials --provider aws --key [Access key ID] --secret [Secret access key]
```
Generate a boilerplate
```
serverless create --template aws-nodejs --path [folder]
```
Then it will create a boilerplate using the template for Node.js. Go into the root folder, and install the required packages.
```
cd [folder]
npm init -y && npm install
```
And also install express and serverless-http with the command below:
```
npm install express serverless-http
```

Expose an HTTP endpoint

In the serverless.yml file, comment out and change the following code:

functions:
   app:
      handler: app.server
        events:
            - http:
                path: /
                method: get
                cors: true

Set up Express

Delete handler.js file, and create one named app.js:
```
const express = require('express');
const app = express();
const sls = require('serverless-http');

app.get('/', async (req, res, next) => {
    res.status(200).send('It\'s working')
});

module.exports.server = sls(app);
```
Noticed that, AWS Lambda does not support the ES6 import specifier (at the time of 10/10/2019). import express from 'express' will cause an internal server error. And in the log we can see that it says "Runtime.UserCodeSyntaxError: SyntaxError: Unexpected identifier"
Deploy

serverless deploy

Test the API

In the output, we can see that it exposes an endpoint probably like this.
```
endpoints:
	GET - https://xxxx.execute-api.xx-xxxx-x.amazonaws.com/xxx/
```
Let's try it with the command below:
```
curl https://xxxx.execute-api.xx-xxxx-x.amazonaws.com/xxx/
```
And we will get our message back, "It's working".

maoyalu/lambda_rest_api