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Updated: 2026年5月31日
Api Fetch
Original task (JA): fetchで取得
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Conclusion
Api Fetch — free browser-based JavaScript practice
Why it matters in real projects
fetchでAPIを呼び、res.json()でJSONをパースします。 Similar patterns appear daily in code review and production UI work.Step-by-step workflow
1. Read the guide and understand the goal of "Api Fetch" 2. Review the JavaScript editor pane and start from the starter code 3. Open hints if stuck; compare your diff with the sample solution 4. Click Run and inspect preview/console output 5. Auto-check looks for output containing: sunt, aut, title. 6. After success, continue with adjacent exercises in the same categoryCore concept explained
fetchでAPIを呼び、res.json()でJSONをパースします。Technical focus
Key CSS properties: https.Hint before you peek at the solution
const res = await fetch(url); const data = await res.json();Sample solution walkthrough
JavaScript APIs used: console.log, fetch(, async , await . Verify spelling and async/await usage. Explanation: fetchでAPIを呼び、res.json()でJSONをパースします。 Hint recap: const res = await fetch(url); const data = await res.json();Solution code
📝 Sample code
async function run() {
const res = await fetch('https://jsonplaceholder.typicode.com/posts/1');
const data = await res.json();
console.log(data.title);
}
run();Common mistakes for this exact task
・Skipping the hint: const res = await fetch(url); const data = await res.json(); ・Forgetting await res.json() leaves you with a Promise objectTroubleshooting
Q: Preview does not change after Run A: Ensure you edited the JavaScript pane and clicked Run. Q: Looks correct but check fails A: Auto-check looks for output containing: sunt, aut, title. Look for typos, full-width spaces, or unclosed tags. Q: Console shows errors A: Open DevTools Console and fix bracket/quote mismatches at the reported line. Q: Hard to type on mobile A: Use landscape mode or continue on desktop—the same URL keeps progress in localStorage.Interview / portfolio tips
・Explain the techniques in "Api Fetch" in your own words within 30 seconds ・Practice walking through each line of the sample solution on a whiteboard ・Connect this task to a real component you would ship ・Discuss CSS properties: https ・Describe when you use: console.log, fetch(, asyncWhat to do after you pass
Move to the next exercise in the api track, then continue the learning roadmap at /en/learning/api/.Keywords
Free hands-on exercise covering fetchで取得, api, 中級, https, console.log, fetch(, async , await , api fetch—search-friendly guide for Api Fetch.🧪 Try it here — safe to break things
Use the editor below to write code and preview instantly.
Jump to editor■ Exercise task
https://jsonplaceholder.typicode.com/posts/1 からデータをfetchし、titleをconsole.logで出力してください。
Hint if stuck
const res = await fetch(url); const data = await res.json();