opting out of fetch cache | Next.js | Page 1

kind sigil Apr 21, 2024, 3:39 AM

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when would i opt out of fetch cache
when would i use 'force-dynamic'

remote lightBOT Apr 21, 2024, 3:39 AM

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Hi @kind sigil. 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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You might opt out of the fetch cache in Next.js when you want to dynamically render components for every incoming request. This means that data will be fetched whenever fetch is called, ensuring that you always have the most up-to-date data. You can opt out of caching by setting the cache option to no-store in your fetch request. Here's an example:

// Opt out of caching for an individual `fetch` request
fetch(`<https://...`,> { cache: 'no-store' })

Source (https://nextjs.org/docs/app/building-your-application/caching#opting-out-1)

The force-dynamic option is used to opt out of the Full Route Cache and the Data Cache in Next.js. This means that components will be rendered and data fetched on every incoming request to the server. However, the Router Cache will still apply as it's a client-side cache. Here's an example:

// Opt out of caching for all data requests in the route segment
export const dynamic = 'force-dynamic'

Source (https://nextjs.org/docs/app/building-your-application/caching#opting-out-2)

However, it's worth noting that usage of force-dynamic can be avoided and instead no-store or fetch calls can be used. This is because opting out of caching can prevent future optimizations such as partially static subtrees and hybrid server-side rendering, which can significantly improve performance.

// Example of how to use `no-store` on `fetch` calls.
const data = fetch(someURL, { cache: 'no-store' });

Source (https://vercel.com/docs/workflow-collaboration/conformance/rules/NEXTJS_NO_DYNAMIC_AUTO)

Remember to consider your application's specific needs and performance requirements when deciding whether to opt out of caching.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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@kind sigil kapa.ai is still learning and improving, please let us know how it did by reacting below

kind sigil Apr 21, 2024, 3:40 AM

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@remote light but give me a exact use case for using each one?
and when do i use next revalidate

remote lightBOT Apr 21, 2024, 3:40 AM

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Let me check the knowledge base for you. One moment! :books:

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Sure, let's go through each one:

Opting out of fetch cache: You might want to opt out of fetch cache when you're dealing with data that changes frequently and needs to be fetched in real-time. For example, if you're building a live chat application, you would want to fetch the latest messages for every request, so you would opt out of fetch cache.

fetch('<https://api.example.com/messages',> { cache: 'no-store' })

Source (https://nextjs.org/docs/app/building-your-application/caching#opting-out-1)

Using 'force-dynamic': This option is used when you want to ensure that your page is always rendered dynamically, regardless of whether it contains dynamic data or not. This could be useful in a scenario where the content of your page depends on some user-specific or session-specific data that changes frequently. For example, a personalized dashboard that shows different data for each user.

export const dynamic = 'force-dynamic'

Source (https://nextjs.org/docs/app/building-your-application/caching#opting-out-2)

Using next.revalidate: This option is used when you want to revalidate (update) your cached data after a certain period of time. This is useful when your data changes, but not frequently enough to require fetching it for every request. For example, if you're displaying a list of blog posts that gets updated every hour, you could use next.revalidate to update your cache every hour.

fetch('<https://api.example.com/posts',> { next: { revalidate: 3600 } })

Source (https://nextjs.org/docs/app/building-your-application/caching#fetch-optionsnextrevalidate)

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Remember, these are just examples. The exact use case will depend on the specific requirements of your application.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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@kind sigil kapa.ai is still learning and improving, please let us know how it did by reacting below

kind sigil Apr 21, 2024, 3:46 AM

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@remote light what is data revalidaiton

remote lightBOT Apr 21, 2024, 3:46 AM

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Let me check the knowledge base for you. One moment! :books:

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Data revalidation in Next.js is the process of updating the cached data by purging the Data Cache and re-fetching the latest data from the data source. This is useful when your data changes and you want to ensure you show the latest information.

There are two ways to revalidate cached data:

Time-based revalidation: This automatically revalidates data after a certain amount of time has passed. This is useful for data that changes infrequently and freshness is not as critical. For example, you can set the cache lifetime of a resource to one hour like this:

fetch('<https://...',> { next: { revalidate: 3600 } })

Source (https://nextjs.org/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating#revalidating-data)

On-demand revalidation: This manually revalidates data based on an event (e.g. form submission). On-demand revalidation can use a tag-based or path-based approach to revalidate groups of data at once. This is useful when you want to ensure the latest data is shown as soon as possible (e.g. when content from your headless CMS is updated). For example, you can revalidate data by path using the revalidatePath function:

revalidatePath('/')

Source (https://nextjs.org/docs/app/building-your-application/caching#revalidatepath)

If an error is thrown while attempting to revalidate data, the last successfully generated data will continue to be served from the cache. On the next subsequent request, Next.js will retry revalidating the data.
Source (https://nextjs.org/docs/app/building-your-application/data-fetching/fetching-caching-and-revalidating#error-handling-and-revalidation)

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

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@kind sigil kapa.ai is still learning and improving, please let us know how it did by reacting below

kind sigil Apr 21, 2024, 3:48 AM

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@remote light do i put this in my page.tsx or my route.ts
export const dynamic = 'force-dynamic'

remote lightBOT Apr 21, 2024, 3:48 AM

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Let me check the knowledge base for you. One moment! :books:

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The dynamic option can be set in either page.tsx, layout.tsx, or route.ts. It is used to configure the behavior of the route segment.

For example, if you want to apply force-dynamic to a specific page, you can place it in the page.tsx file for that page:

export const dynamic = 'force-dynamic'

Source (https://nextjs.org/docs/app/api-reference/file-conventions/route-segment-config#dynamic)

If you want to apply force-dynamic to all pages within a layout, you can place it in the layout.tsx file:

export const dynamic = 'force-dynamic'

Source (https://github.com/vercel/next.js/issues/59052)

And if you want to apply force-dynamic to a specific route, you can place it in the route.ts file for that route:

export const dynamic = 'force-dynamic'

Source (https://nextjs.org/docs/app/api-reference/file-conventions/route-segment-config#dynamic)

Remember, setting `dynamic` to `'force-dynamic'` will result in routes being rendered for each user at request time, which can have performance implications. Always consider your application's specific needs and performance requirements when deciding to use `'force-dynamic'`.

#opting out of fetch cache

Remember to consider your application's specific needs and performance requirements when deciding whether to opt out of caching.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Remember, these are just examples. The exact use case will depend on the specific requirements of your application.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Remember, setting dynamic to 'force-dynamic' will result in routes being rendered for each user at request time, which can have performance implications. Always consider your application's specific needs and performance requirements when deciding to use 'force-dynamic'.

Note: you can ask me a follow up question by @ mentioning me again :speech_balloon:

Remember, setting `dynamic` to `'force-dynamic'` will result in routes being rendered for each user at request time, which can have performance implications. Always consider your application's specific needs and performance requirements when deciding to use `'force-dynamic'`.