You should try json

index.js

const axios = require('axios').default;

const URL = 'https://letsrevolutionizetesting.com/challenge.json';

function call(url) {
    return axios.get(url).then((res) => {
        return res.data;
    });
}

function start(url) {
    return call(url).then((res) => {
        const { follow } = res;

        if (follow) {
            return start(follow.replace('challenge?', 'challenge.json?'));
        }

        return res;
    });
}

start(URL)
    .then(({ message }) => console.log(`Result: ${message}`))
    .catch((error) => console.log(`Error: ${error}`));