Code for an Azure Function that sometimes returns failure (on purposes, 75% of the time, useful for testing)

Fail75.js

module.exports = function (context, req) {
    if (Math.random() > 0.75) {
        context.log('Azure Function "Fail75" is randomly (25%) returning 200 OK.');
        context.res = {
            body: "Randomly (25%) returning 200 OK."
        }
    }
    else {
        context.log('Azure Function "Fail75" is randomly (75%) returning 500 as a transient error.');
        context.res = {
            status: 500, // something transient
            body: "Randomly (75%) returning 500 as a transient error."
        };
    }
    context.done();
};