JavaScript: Saving Data in the Browser with localStorage and sessionStorage

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About Course

Learn how the Web Storage API lets a web page remember settings and drafts in the browser. Covers the difference between localStorage and sessionStorage, storing objects with JSON, reacting to changes in other tabs, private browsing, error handling, and what should never be stored there.

Tutwoo is an independent learning provider. This course is general training based on MDN Web Docs and ICO guidance. It is not legal advice and is not endorsed by those organisations.

© 2026 Tutwoo UK Limited. This course was created in-house by Tutwoo and is our original work. It is for your own learning only: please do not copy, share, record or resell it.

What Will You Learn?

  • Choose between localStorage and sessionStorage for a task
  • Store and retrieve objects safely using JSON
  • Handle missing data, errors and private browsing gracefully
  • Explain the security and privacy limits of browser storage

Course Content

Course Lessons

  • localStorage and sessionStorage
  • Storing objects, listening for changes and handling errors
  • Security, privacy and good practice

Sources & Further Reading
The official guidance this course is based on.

Final Assessment

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