Nuxt 3 offers immense capabilities for building exceptional web applications, but optimizing their performance for speed is crucial. This is where caching comes into play, significantly reducing server load and boosting your app's responsiveness. However, navigating the nuances of Nuxt 3's caching system can be tricky. Worry not, intrepid developer, for this guide will be your compass!
Nuxt 3's useFetch
composable provides a powerful way to fetch data from APIs and other sources. It also offers built-in caching capabilities, which can help improve the performance of your application.
What is caching?
Caching is a technique for storing frequently accessed data in a temporary location so that it can be retrieved quickly and efficiently. In the context of Nuxt 3, caching can be used to store the results of API calls, database queries, or any other expensive operation.
Benefits of caching
There are several benefits to using caching in your Nuxt 3 application:
Improved performance: By caching data, you can avoid making repeated requests to the same API or data source. This can significantly improve the loading times of your application.
Reduced server load: By caching data, you can reduce the load on your server, which can improve its scalability and stability.
Better user experience: Caching can lead to a smoother and more responsive user experience, as data will be available more quickly.
Implementing caching with useFetch
The useFetch
composable provides a getCachedData
option that allows you to implement caching. This option takes a function as an argument, which should return the cached data if it exists. If the function returns null
or undefined
, then a new fetch will be triggered.
Here is an example of how to use getCachedData
with useFetch
to implement caching:
const { data, pending, error, refresh } = await useFetch('/api/data', {
key: 'my-data', // This key will be used to identify the cached data
getCachedData: (key) => {
// Check if the data is already cached in the Nuxt payload
if (nuxt.isHydrating && nuxt.payload.data[key]) {
return nuxt.payload.data[key]
}
// Check if the data is already cached in the static data
if (nuxt.static.data[key]) {
return nuxt.static.data[key]
}
return null
},
})
if (!data.value) {
// The data was not cached, so fetch it from the server
await refresh()
} else {
// The data was cached, so use it
console.log('Using cached data:', data.value)
}
This example first defines a key for the cached data. Then, it provides a getCachedData
function that checks if the data is already cached in either the Nuxt payload or the static data. If the data is found, it is returned from the function. Otherwise, null
is returned, which triggers a new fetch.
Finally, the example checks if the data value is null
. If it is, then the data was not cached and the refresh
function is called to fetch it from the server. Otherwise, the data was cached and it is used.
Conclusion
Caching can be a powerful tool for improving the performance of your Nuxt 3 application. By using the useFetch
composable's getCachedData
option and other caching strategies, you can ensure that your application is fast, efficient, and responsive.
For more information on caching with Nuxt 3, you can refer to the documentation: useFetch - Nuxt Composables
Top comments (1)
This article is just partial and not comprehensive, I would like to know hot setup cache that nuxt won't need to render on SSR every time.. whats the point of SSR when it is not cached? Yes it reuses api calls via useFetch, but for my usecase I would love to return very same page result to every nonlogged user, already generated by nuxt and not regenerate each request as it works now. Thank you in advance for some advice 🙏