samplefunction1.txt

'use strict';       //cannot use vars that are not defined
console.log('loading sample function 1.....');

//function needs to be exported
//cjs = commonJS, require(),module exports      <---- nodejs <14
//es m = import, export const function1 = () => {} <--nodejs >=16

//user request is in JSON format
export const handler = async(event) =>{

    let name = 'John';
    let city = 'Manila';
    let responseCode = 200;

    console.log("request:" + JSON.stringify(event));

    if(event.queryStringParameter && event.queryStringParameter.name){
        console.log("received name:" + event.queryStringParameter.name);
        name = event.queryStringParameter.name;
    }

    if(event.queryStringParameter && event.queryStringParameter.city){
        console.log("received city:" + event.queryStringParameter.city);
        city = event.queryStringParameter.city;
    }

    let greeting = `Good day ${name} of ${city}`;

    let responseBody = {
        message: greeting,
        input: event
    }

    let response = {
        statusCode: responseCode,
        headers: {
            "x-custom-header": "my custom header value"
        },
        body: JSON.stringify(responseBody);
    }

    console.log("response:" + JSON.stringify(response));

    return response;

}