Step 1: Create a NodeJs Lambda function
- Select Lambda service
- Click on Create function button
- Select Author From Scratch.
- Function name : ApiFunc
- Runtime: Node.js 14.x (arm68)
- Permission ---> change default execution role
- Select create new role from AWS policy Template
- Provide the role name apifuncrole
- Click on Create function button (this will take some time)
Step 2: Use the below code for the Lambda function
'use strict';
const https = require('https');
exports.handler = async (event) => {
let dataString = '';
const response = await new Promise((resolve, reject) => {
const req = https.get("https://jsonplaceholder.typicode.com/todos/1", function(res) {
res.on('data', chunk => {
dataString += chunk;
});
res.on('end', () => {
resolve({
statusCode: 200,
body: JSON.stringify(
{
"data": JSON.parse(dataString).title,
"timestamp": new Date()
}, null, 4
)
});
});
});
req.on('error', (e) => {
reject({
statusCode: 500,
body: 'Something went wrong!'
});
});
});
return response;
};
Then Click on File--->save and Click on Deploy
Step 3: Create Rest API using API Gateway.
- Select API Gateway Service
- Click on Create API button
- Select RestAPI
- Click on Build button
- Select New API
- Put in any Api Name: myapi
- Click on Create Api Button.
Step 4: Create a Resource
- Select Action--> Create Resource
- Resource Name: what-is-my-title
- Click on Create Resource Button
Step 5: Initialize GET Method for Resource
- Select resource what-is-my-title
- Go to Action
- Create Method from Drop down
- select Get Method
- click on tick mark
Step 6:Choose the integration point for your new method (link to your lambda function).
- Click on Get Method
- Integration Type: Lambda Function
- Select check box Use Lambda proxy Integration
- Lambda function: <<Lamda function you created in step 1>>
- Click on Save button
Step 7: Staging the API (masking it with the first layer or exposing the service) www.google.com/irfan-api
- Select GET and Goto Action--->Deploy API
- Deployment Stage : New Stage
- Stage Name: api
- Click on the Deploy button.
Step 8: You will find a prompt indicating: Invoke URL on the top and open that URL in a new tab and at the end of the URL.
- add what-is-my-title
- You will be able to see the title and current date and time
Step 9: Download the Json file for API Gateway.
- In the Stages page, click on Export tab
- select the Swagger
- select Export as Swagger and click on json.
Step 10: Go to IAM services, click on Roles Tab, take screen shot and copy IAM Role policy
