Is the Pinia store being cached by default?
My users are sometimes experiencing odd behavior after I've pushed to my production environment. I couldn't reproduce their issues but it only happens when I change the Pinia store schema.
So I assume Nuxt 3 + Pinia cache the state values somehow. To better understand this, I'm wondering:
1. If this is actually the case by default?
2. If this is the case, where is this data saved? Local storage? Cookies?
I'm thinking about saving a hash value in my store and then comparing it after making a deployment. If it doesn't match, I want to reset the store/clear the cache. But in order to do so, I need to better understand if/how Pinia caches...
Thank you very much
2 Replies
Hi @Phillip. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave:
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Based on the information provided in the knowledge sources, I can address your questions about Pinia store caching in Nuxt 3:
1. By default, Pinia stores are not automatically cached in Nuxt 3. However, there are ways to persist state between reloads or implement caching mechanisms.
2. The data is not automatically saved in local storage or cookies by default. You would need to implement such functionality yourself or use additional plugins.
The behavior you're describing could be related to a few different factors:
1. Server-side rendering and hydration mismatches: Nuxt 3 uses server-side rendering, which can sometimes lead to hydration mismatches if the state is not properly managed between server and client. This can cause unexpected behavior, especially after deployments YouTube: Nuxt tips: Server Rendering and Global State (https://www.youtube.com/watch?v=dZSNW07sO-A).
2. Experimental features: Nuxt 3 has some experimental features related to state restoration. For example, the
restoreState option allows app state to be restored from sessionStorage after reloading the page or chunk errors. This is not enabled by default and can cause unexpected behavior if used Nuxt Docs: Experimental Features - restoreState (https://nuxt.com/docs/guide/going-further/experimental-features#restorestate).
3. Browser caching: The issues your users are experiencing might be related to browser caching of old JavaScript bundles rather than Pinia state caching.
To address your specific use case, here are some suggestions:
1. Instead of relying on automatic caching, you can implement state persistence yourself using useCookie. This approach allows you to control when and how state is saved and retrieved Stack Overflow: Persist State Between Reloads in Nuxt v3 (https://stackoverflow.com/questions/77882887).
2. If you want to implement a version check as you described, you could store your version hash in a cookie using useCookie and compare it on each load.
3. To ensure users always get the latest version of your app after deployment, you can implement cache busting techniques or use Nuxt's built-in caching mechanisms more explicitly YouTube: Caching in Nitro (https://www.youtube.com/watch?v=KN5e2Hh6uC0).
Remember, Pinia itself doesn't implement caching by default. If you're experiencing caching-like behavior, it's likely due to how your Nuxt application is configured or how the browser is caching resources.
To implement a more robust solution, you might want to look into Nuxt's storage options, which allow you to customize where and how data is stored, including options for various drivers like Redis, filesystem, or memory storage Nitro Docs: Customize cache storage (https://nitro.unjs.io/guide/cache#customize-cache-storage).
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