In this article, you'll learn about:
- Overview
- VWO Dependencies on Local Storage Keys
- Local Storage Keys Created by VWO
- Impact of Blocked Local Storage Keys
Overview
Local storage keys store data in the browser's local storage to save account configurations and visitor states. Unlike cookies, local storage keys are not sent with every HTTP request. They are used only by VWO’s client-side JavaScript libraries to persist information across sessions or page reloads.
VWO Dependencies on Local Storage Keys
VWO relies on local storage keys to ensure the proper functioning of its features, such as tracking user behavior, preserving configurations, and managing experiment states. These keys help VWO deliver a seamless and consistent user experience across pages and sessions.
Local Storage Keys Created by VWO
| Key | Purpose | Applicable for Product(s) |
| _vwo_nlsCache | Stores Insights data unique to every session. | VWO Insights |
| _vwo_nls_q_767128 | Prevents data loss for Insights campaigns during redirections. | VWO Insights - Recordings |
| vwo_apm_sent | Created when VWO’s monitoring JavaScript library is served after sampling to prevent duplication sampling. | NA |
| debug_vwoSn | Stores session information, including the first page of a session and its referrer URL. | All |
| _vis_opt_ls669061 | Used in surveys to store their state. | VWO Insights - Surveys |
| vwo_<acc-id>_config | Contains the account’s SmartCode config controlled from the app. Refer to Registering Your Website and Apps in VWO for options. | All |
| _vwo_eventHist |
Stores relevant data of visitors to support historical targeting for personalized campaigns. Refer to Personalize With the Power of Historical Targeting in VWO for more details.
|
VWO Personalize |
| _vwo_eventHistSession | ||
| _vwo_syE | ||
| _vwo_syV | ||
| _vwo_visProps |
Impact of Blocked Storage Keys
If local storage keys are blocked or not allowed in a user's browser, the following issues may arise:
-
Loss of Insights data
VWO might fail to store and retrieve important information required for tracking and reporting.
-
Experiment failures
User segmentation, experiment targeting, or variation tracking may not function as expected.
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Reduced functionality
Features like surveys, advanced tracking, and performance monitoring may not work effectively.
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Inconsistent user experiences
Experiments and campaigns might reset on each page reload, leading to erratic behavior.
If you have any queries about VWO local storage keys, contact us at support@vwo.com.