> For the complete documentation index, see [llms.txt](https://www.i18next.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.i18next.com/how-to/caching.md).
# Caching
## Browser caching with local storage
With i18next you can configure a cache layer to be used in the browser. It will load and cache resources from [localStorage](https://github.com/i18next/i18next-localstorage-backend) and can be used in combination with the [chained backend](https://github.com/i18next/i18next-chained-backend).
```javascript
import i18next from "i18next";
import ChainedBackend from "i18next-chained-backend";
import HttpBackend from "i18next-http-backend";
import LocalStorageBackend from "i18next-localstorage-backend";
i18next
.use(ChainedBackend)
.init({
fallbackLng: "en",
// ... your i18next config
backend: {
backends: [
LocalStorageBackend,
HttpBackend
],
backendOptions: [{
expirationTime: 7 * 24 * 60 * 60 * 1000 // 7 days
}, {
loadPath: '/locales/{{lng}}/{{ns}}.json'
}]
}
});
```
{% hint style="info" %}
More information can be found here:\
[i18next-chained-backend](https://github.com/i18next/i18next-chained-backend)\
[i18next-localstorage-backend](https://github.com/i18next/i18next-localstorage-backend)\
[i18next-http-backend](https://github.com/i18next/i18next-http-backend)
{% endhint %}
## Server side caching with filesystem
With i18next you can configure a cache layer to be used on server side. It will load and cache resources from the [filesystem](https://github.com/i18next/i18next-fs-backend) and can be used in combination with the [chained backend](https://github.com/i18next/i18next-chained-backend).
```javascript
import i18next from "i18next";
import ChainedBackend from "i18next-chained-backend";
import HttpBackend from "i18next-http-backend";
import FsBackend from "i18next-fs-backend";
i18next
.use(ChainedBackend)
.init({
fallbackLng: "en",
// ... your i18next config
backend: {
backends: [
FsBackend,
HttpBackend
],
backendOptions: [{
expirationTime: 7 * 24 * 60 * 60 * 1000, // 7 days
loadPath: './locales_cache/{{lng}}/{{ns}}.json',
addPath: './locales_cache/{{lng}}/{{ns}}.json' // make sure the folders "locales_cache/{{lng}}" exists
}, {
loadPath: '/locales/{{lng}}/{{ns}}.json'
}]
}
});
```
{% hint style="info" %}
More information can be found here:\
[i18next-chained-backend](https://github.com/i18next/i18next-chained-backend)\
[i18next-fs-backend](https://github.com/i18next/i18next-fs-backend)\
[i18next-http-backend](https://github.com/i18next/i18next-http-backend)
{% endhint %}
## React-native caching with AsyncStorage
With i18next you can configure a cache layer to be used on react-native. It will load and cache resources from the [AsyncStorage](https://github.com/timbrandin/i18next-async-storage-backend) and can be used in combination with the [chained backend](https://github.com/i18next/i18next-chained-backend).
```javascript
import i18next from "i18next";
import ChainedBackend from "i18next-chained-backend";
import HttpBackend from "i18next-http-backend";
import AsyncStorageBackend from "i18next-async-storage-backend";
i18next
.use(ChainedBackend)
.init({
fallbackLng: "en",
// ... your i18next config
backend: {
backends: [
AsyncStorageBackend,
HttpBackend
],
backendOptions: [{
expirationTime: 7 * 24 * 60 * 60 * 1000 // 7 days
}, {
loadPath: '/locales/{{lng}}/{{ns}}.json'
}]
}
});
```
{% hint style="info" %}
More information can be found here:\
[i18next-chained-backend](https://github.com/i18next/i18next-chained-backend)\
[i18next-async-storage-backend](https://github.com/timbrandin/i18next-async-storage-backend)\
[i18next-http-backend](https://github.com/i18next/i18next-http-backend)
{% endhint %}
## Next.js caching with next-i18next
With [next-i18next](https://github.com/i18next/next-i18next) v16+, you can use client-side caching with [i18next-chained-backend](https://github.com/i18next/i18next-chained-backend) and [i18next-localstorage-backend](https://github.com/i18next/i18next-localstorage-backend). Translations are bundled at build time (via `resourceLoader` for App Router or `serverSideTranslations` for Pages Router), and the client can fetch fresh translations from a backend with localStorage caching.
For a complete example using both App Router and Pages Router with [Locize](https://www.locize.com/i18next?utm_source=i18next_com\&utm_medium=gitbook\&utm_campaign=how_to_caching), have a look at the [next-i18next-locize example](https://github.com/locize/next-i18next-locize).
### App Router (client-side caching with Locize)
```javascript
// I18nProviderWithLocize.js
'use client'
import { I18nProvider } from 'next-i18next/client'
import LocizeBackend from 'i18next-locize-backend'
import ChainedBackend from 'i18next-chained-backend'
import LocalStorageBackend from 'i18next-localstorage-backend'
export function I18nProviderWithLocize({ children, language, resources, supportedLngs, defaultNS }) {
return (
{children}
)
}
```
### Pages Router (client-side caching with Locize)
```javascript
// next-i18next.config.js
const LocizeBackend = require('i18next-locize-backend/cjs')
const ChainedBackend = require('i18next-chained-backend').default
const LocalStorageBackend = require('i18next-localstorage-backend').default
const isBrowser = typeof window !== 'undefined'
module.exports = {
i18n: {
defaultLocale: 'en',
locales: ['en', 'de'],
},
backend: {
backendOptions: [{
expirationTime: 60 * 60 * 1000 // 1 hour
}, {
projectId: '[PROJECT_ID]',
version: 'latest'
}],
backends: isBrowser ? [LocalStorageBackend, LocizeBackend] : [],
},
partialBundledLanguages: isBrowser && true,
serializeConfig: false,
use: isBrowser ? [ChainedBackend] : [],
}
```
{% hint style="info" %}
More information can be found here: [next-i18next-locize example](https://github.com/locize/next-i18next-locize) [i18next-chained-backend](https://github.com/i18next/i18next-chained-backend) [i18next-localstorage-backend](https://github.com/i18next/i18next-localstorage-backend) [i18next-locize-backend](https://github.com/locize/i18next-locize-backend)
{% endhint %}
{% hint style="danger" %}
We suggest not to use multiple backends with the [i18next-chained-backend](https://github.com/i18next/i18next-chained-backend) in combination with saveMissing or updateMissing, because it may happen, that the trigger for this is based on stale data.
{% endhint %}
---
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Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:
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