API Example

Build a new function Random Number Generator

Random Number generator

exports.handler = (event, context, callback) => {

    let min = 0;

    let max = 10;

    

    let generateNumber = Math.floor(Math.random() * max) + min;

    callback(null, generateNumber);

    };

No JSON needed The Math.floor() function returns the largest integer less than or equal to a given number. Note: Math.floor(null) returns integer 0 and do not give a NaN error. The Math.random() function returns a floating-point, pseudo-random number in the range 0–1 (inclusive of 0, but not 1) with approximately uniform distribution over that range — which you can then scale to your desired range. The implementation selects the initial seed to the random number generation algorithm; it cannot be chosen or reset by the user. Create an API connecting the function called randomnumbers Use REST and New API Next step would be to create a resource for the API - resource called random Add a GET Method and hit the check mark Attach a Lambda function the the GET Method Click TEST to test the API Get Method Now test the API

The response body shows the results of the random number generator the Status 200 states that the http call was successful the next step is to deploy the API which will create an accessible URL The Stage name will be prod The deployment creates an endpoint via URL address string The GET method contains the URL link random number generator Next we will be passing name pair values to functions using the URL BY USING ? AFTER URL Now we will edit the Integration Request We need to define input variables adding a body mapping template to the Integration Request Build a querystring for the function {     "min": $input.params('min'),     "max": $input.params('max')     } Change the randomNumberGenerator function to use the event parameters The parseInt() function parses a string argument and returns an integer of the specified radix (the base in mathematical numeral systems). console.log('Starting Function'); exports.handler = (event, context, callback) => {     let min = event.min;     let max = event.max;       let generateNumber = Math.floor(Math.random() * max) + min;     callback(null, generateNumber);     }; Redeploy and pass parameters via the URL String https://2ntt48niz6.execute-api.us-east-1.amazonaws.com/prod/random?min=1&max=10