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Updated: May 31, 2026

Project Local Storage

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Conclusion

Project Local Storage — free browser-based JavaScript practice

■ What this exercise teaches Save value "Taro" under the key "name" in localStorage, then read it back and output it with console.log.

Why it matters in real projects

localStorage persists data in the browser even after it closes. Similar patterns appear daily in code review and production UI work.

Step-by-step workflow

1. Read the guide and understand the goal of "Project Local Storage" 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: Taro. 6. After success, continue with adjacent exercises in the same category

Core concept explained

localStorage persists data in the browser even after it closes.

Technical focus

Key JavaScript APIs: console.log, localStorage.setItem, localStorage.getItem.

Hint before you peek at the solution

localStorage.setItem, localStorage.getItem

Sample solution walkthrough

JavaScript APIs used: console.log, localStorage.setItem, localStorage.getItem. Verify spelling and async/await usage. Explanation: localStorage persists data in the browser even after it closes. Hint recap: localStorage.setItem, localStorage.getItem

Solution code

📝 Sample code
localStorage.setItem('name', 'Taro');
console.log(localStorage.getItem('name'));

Common mistakes for this exact task

- Skipping the hint: localStorage.setItem, localStorage.getItem

Troubleshooting

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: Taro. 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 "Project Local Storage" 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 - Mention responsive or accessibility trade-offs - Describe when you use: console.log, localStorage.setItem, localStorage.getItem

What to do after you pass

Move to the next exercise in the project track, then continue the learning roadmap at /en/learning/project/.

Keywords

Free hands-on exercise covering Local storage, project, intermediate, console.log, localStorage.setItem, localStorage.getItem, project local storage—search-friendly guide for Project Local Storage.

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■ Exercise task

Save value "Taro" under the key "name" in localStorage, then read it back and output it with console.log.

Hint if stuck

localStorage.setItem, localStorage.getItem

20pt

Local storage

Save value "Taro" under the key "name" in localStorage, then read it back and output it with console.log.

Click error to highlight line. ✕=error ⚠=warning ›=log.

Roadmap · All guides

Deep dive

"Project Local Storage" is a intermediate-level JavaScript exercise. Save value "Taro" under the key "name" in localStorage, then read it back and output it with console.log. Run it in-browser with automatic checking.

localStorage persists data in the browser even after it closes. Similar patterns appear daily in code review and production UI work.

Pair this with the project roadmap. Exercise #70 reinforces core project skills.

Step-by-step workflow

  1. Read the guide and understand the goal of "Project Local Storage"
  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: Taro.
  6. After success, continue with adjacent exercises in the same category

How to read the sample solution

JavaScript APIs used: console.log, localStorage.setItem, localStorage.getItem. Verify spelling and async/await usage. Explanation: localStorage persists data in the browser even after it closes. Hint recap: localStorage.setItem, localStorage.getItem

Real-world & career relevance

Todo, counter, and timer apps are common live-coding tasks and strong portfolio pieces.

Common mistakes

  • Skipping the hint: localStorage.setItem, localStorage.getItem
  • Keeping state only in DOM
  • Double-binding event listeners
  • Storing secrets in localStorage

Troubleshooting

Preview does not change after Run
Ensure you edited the JavaScript pane and clicked Run.
Looks correct but check fails
Auto-check looks for output containing: Taro. Look for typos, full-width spaces, or unclosed tags.
Console shows errors
Open DevTools Console and fix bracket/quote mismatches at the reported line.
Hard to type on mobile
Use landscape mode or continue on desktop—the same URL keeps progress in localStorage.

Interview & portfolio tips

  • Explain the techniques in "Project Local Storage" 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
  • Mention responsive or accessibility trade-offs
  • Describe when you use: console.log, localStorage.setItem, localStorage.getItem

Glossary

localStorage
Persistent key-value storage in the browser.
setTimeout
Run a function after a delay.
State
App data like counts held in one place.

Keywords covered on this page

Free hands-on exercise covering Local storage, project, intermediate, console.log, localStorage.setItem, localStorage.getItem, project local storage—search-friendly guide for Project Local Storage.

Related dev tools

Learning roadmap

Learning roadmap →

Related exercises

Frequently asked questions

Is "Local storage" free?

This exercise is free and runs entirely in your browser. No account or credit card required.

Difficulty and time?

"Local storage" is level "intermediate". Read the guide first; beginners can usually finish within 30 minutes. Allow 5–15 minutes per exercise. Use hints, then the solution if stuck.

What after a correct answer?

After a correct answer, use "Next exercise". When you finish a category, continue on the <a href="/en/learning/project/">learning roadmap</a>.

Works on mobile?

Works on mobile browsers, but typing code is easier on a desktop.

Where are other exercises?

All exercises: <a href="/en/learn/">/en/learn/</a> with category filters.

Key takeaway for "Local storage"?

localStorage persists data in the browser even after it closes. Hint: localStorage.setItem, localStorage.getItem

Where does Projects fit?

Todo, counter, and timer apps are common live-coding tasks and strong portfolio pieces.

Step-by-step for "Project Local Storage"?

1. Read the guide and understand the goal of "Project Local Storage"<br />2. Review the JavaScript editor pane and start from the starter code<br />3. Open hints if stuck; compare your diff with the sample solution<br />4. Click Run and inspect preview/console output<br />5. Auto-check looks for output containing: Taro.<br />6. After success, continue with adjacent exercises in the same category

How to read the sample solution?

JavaScript APIs used: console.log, localStorage.setItem, localStorage.getItem. Verify spelling and async/await usage.<br /><br />Explanation: localStorage persists data in the browser even after it closes.<br /><br />Hint recap: localStorage.setItem, localStorage.getItem

Something is not working?

<strong>Preview does not change after Run</strong> → Ensure you edited the JavaScript pane and clicked Run.<br /><strong>Looks correct but check fails</strong> → Auto-check looks for output containing: Taro. Look for typos, full-width spaces, or unclosed tags.<br /><strong>Console shows errors</strong> → Open DevTools Console and fix bracket/quote mismatches at the reported line.<br /><strong>Hard to type on mobile</strong> → Use landscape mode or continue on desktop—the same URL keeps progress in localStorage.

Career / interview angle?

Explain the techniques in "Project Local Storage" 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 Mention responsive or accessibility trade-offs Describe when you use: console.log, localStorage.setItem, localStorage.getItem

Related dev tools?

<a href="/en/tools/json-formatter/">JSON Formatter</a>, <a href="/en/tools/memo/">Memo Pad</a>

Prerequisites?

Read the <a href="/en/learning/project/">Learning roadmap</a> chapter first.

Can I change the starter code?

Yes—if it works. Understanding the starter first, then adding minimal diffs, speeds up learning.

What do the points mean?

20pt is a difficulty hint, not a score you must maximize.