Aws Lambda Nodejs serve http + ServerLess

5 min readApr 29, 2023

“Aws Lambda, Nodejs, http server, Serverless”

Long time ago that I have been DevOps engineer and need to maintain Cloud Function from Google Cloud. I think it ok simple. But few time that I have requirement from team vendor that implement application on AWS and they request to have simple api server to handle from webhook on cloud such as Jira and so on.

Objective

Create first Lambda function with simple UI
Create express with package serverless-http
Create serverless + express

Prerequisite

Nodejs
AWS account with access to console

Create first Lambda function with simple UI

Login to AWS console
Services and Lambda
Click Create function button
Select Author from scratch
Function name : test-first-lambda
Runtime: Node.js 14.x or else

Click Advanced setting
Enable function URL
Auth type: NONE
Click Create function

Open URL

Simple let go on

Create express with package serverless-http

On your local machine
Create Folder: devops-test-express
Create file: index.js

const express = require('express');
const port = process.env.PORT || 3000;
const app = express();

app.get('/', (req, res) => {
    const text = '{"name":"John", "birth":"1986-12-14", "city":"New York"}';
    const obj = JSON.parse(text);
    console.log(obj)
    res.status(200)
    res.send(obj)
});

app.get('/healthcheck', (req, res) => {
    res.status(200)
    res.send('ok')
});

app.get('/create', (req, res) => {
    res.status(201)
    res.send('created')
});

app.listen(port, () => {
    console.log(`Server is listening on port ${port}.`);
});

npm init -y
npm install express --save
npm start

Test on localhost:3000

const serverless = require('serverless-http');

exports.handler = serverless(app);

Set ENV for local and on Lambda. So

const express = require('express');
const serverless = require('serverless-http');
const port = process.env.PORT || 3000;
const app = express();

app.get('/', (req, res) => {
    const text = '{"name":"John", "birth":"1986-12-14", "city":"New York"}';
    const obj = JSON.parse(text);
    console.log(obj)
    res.status(200)
    res.send(obj)
});

app.get('/healthcheck', (req, res) => {
    res.status(200)
    res.send('ok')
});

app.get('/create', (req, res) => {
    res.status(201)
    res.send('created')
});

if (process.env.ENVIRONMENT === 'production') {
    exports.handler = serverless(app);
} else {
    app.listen(port, () => {
        console.log(`Server is listening on port ${port}.`);
    });
}

npm install serverless-http --save

Zip file

zip -r -y -q dist.zip .

Create new Lambda from scratch with same configuration

Click Upload from Button → .zip file

Choose your file and Save

ADD ENV

Test URL

Create serverless + express

Install serverless : https://www.serverless.com/framework/docs/getting-started

npm install -g serverless

Configuration to connect AWS that need

 
export AWS_ACCESS_KEY_ID=<your-key-here>
export AWS_SECRET_ACCESS_KEY=<your-secret-key-here>

Create New Project with same express code

//index.js
const express = require('express');
const port = process.env.PORT || 3000;
const app = express();

app.get('/', (req, res) => {
    const text = '{"name":"Sutee", "love":"Tech", "job":"DevOps"}';
    const obj = JSON.parse(text);
    console.log(obj)
    res.status(200)
    res.send(obj)
});

app.get('/healthcheck', (req, res) => {
    res.status(200)
    res.send('ok')
});

app.get('/create', (req, res) => {
    res.status(201)
    res.send('created')
});


app.listen(port, () => {
    console.log(`Server is listening on port ${port}.`);
});

npm install aws-lambda-http-server --save

{
  "name": "devops-test-serverless-express",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1",
    "start": "node index.js"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "aws-lambda-http-server": "^0.2.7",
    "express": "^4.18.2"
  }
}

Add aws-lambda.js

exports.proxy = require('aws-lambda-http-server')
require('./index.js')

Add serverless.yml

service: devops-test-serverless-express
provider:
  name: aws
  runtime: nodejs14.x
  region: us-east-2
  stage: alpha
functions:
  proxy:
    handler: aws-lambda.proxy
    events:
      - http:
          path: /{proxy+}
          method: any
      - http:
          path: ''
          method: any

Test on Local

npm start

Deploy with sls

sls deploy

Check Lambda

If don’t need express. It fine

require('http').createServer((req, res) => {
  if (req.url === '/ping') return res.end('pong')
  if (req.url === '/hello') return res.end('world')
  if (req.url === '/') return res.end('ok')
})
.listen(5000)