JSFiddle - React, Tailwind, and code Playground

JavaScript

let next;
let results = [];

const fetchingData = (exerciseName, url='https://wger.de/api/v2/exercise/') => {
    fetch(url)
    .then(data => data.json())
    .then(data => {
        next = data.next;
        data.results.forEach((elem) => {
            if(elem.name.includes(exerciseName)){
                results.push(elem.id);
            }
        });
        console.log(data, next);
    })
    return next ? fetchingData(exerciseName, next) : results;
}

export default fetchingData;