Sample AWS Lambda code with NodeJS

sample-aws-lambda-node.js

export const handler = async (event) => {
    const body = JSON.parse(event.body);
    const queryStrings = event.queryStringParameters;
    
    let capitalCity = 'none';
    const message = !!queryStrings?.message ? queryStrings.message : 'Hello';
    
    switch (body.nation) {
        case 'Indonesia':
            capitalCity = 'Jakarta';
            break;
        
        case 'US':
            capitalCity = 'Washington, D.C.';
            break;
            
        case 'Germany':
            capitalCity = 'Berlin';
            break;
        
        default:
            // code
    }
    
    const response = {
        statusCode: 200,
        body: {
            nation: body.nation,
            capital: capitalCity,
            message: message,
        }
    };
    
    return response;
};

The event JSON will be:

{
  "nation": "Indonesia"
}

Sample POST target endpoint with Function URL:

https://qwertyjr5b2tm245h3fp2broki0djdda.lambda-url.us-west-2.on.aws/?message=HelloWorld