Web Storage: How can the most appropriate durable solution be chosen?
In modern front-end development, we have multiple ways to save data on the client side. Understood. LocalStorage , SessionStorage and Cookies The difference is key to addressing the issue of state management and security.
🚨 Pain point 1: "Lurrent" and "meeting" for user login status
Solutions: If you want the user to keep login next time you turn off the browser, use it LocalStorage Or with expiry time. Cookie 。 If you want the user to write off automatically after closing the tab (e.g., bank application), SessionStorage It's the best choice. This tool allows you to observe changes in the life cycle of these data in real time.
Zip it. Zip it. Zip it. Zip it. Zip it.
Solutions: The LocalStorage is completely transparent to JavaScript, which means if your page exists XSS The loophole, hackers can easily read the sensitive token. To enhance safety, it is recommended that sensitive Session ID Store in HttpOnly Cookie In the middle, so JavaScript can't read it. Note: This tool is limited to browser security policy and cannot be shown HttpOnly Marked Cookie.
Comparison of the three storage schemes
- LocalStorage : approximately 5MB, permanently stored unless manually cleaned. This applies to the preservation of user preferences, offline drafts.
- SessionStorage : About 5MB, data disappears with the tab closing. The temporary state that applies to saving a single session.
- Cookies : Only 4KB capacity will be sent to the server with each HTTP request. Applicable to the preservation of authentication documents.
Debug Recommendations
When developing environmental debugging, it is often necessary to manually modify a key value to test the UI branch logic (e. g.
is_new_user: true
）。 Using the " Edit " function of this tool, you can modify and immediately see the page feedback without updating.