make-url-iterator.js

const content = require('./dummy.json');

function* makeUrlIterator(content) {
    const { groups } = content;
    for (const group of groups) {
        const { data } = group;
        for (const entry of data) {
            yield entry;
        }
    }
}

const urlIterator = makeUrlIterator(content);

console.log(urlIterator.next().value);
// Outputs the first value
console.log(urlIterator.next().value);
// Outputs the second value