# @vates/cached-dns.lookup [](https://npmjs.org/package/@vates/cached-dns.lookup)  [](https://bundlephobia.com/result?p=@vates/cached-dns.lookup) [](https://npmjs.org/package/@vates/cached-dns.lookup) > Cached implementation of dns.lookup ## Install Installation of the [npm package](https://npmjs.org/package/@vates/cached-dns.lookup): ``` > npm install --save @vates/cached-dns.lookup ``` ## Usage Node does not cache queries to `dns.lookup`, which can lead application doing a lot of connections to have perf issues and to saturate Node threads pool. This library attempts to mitigate these problems by providing a version of this function with a version short cache, applied on both errors and results. > Limitation: `verbatim: false` option is not supported. It has exactly the same API as the native method and can be used directly: ```js import { createCachedLookup } from '@vates/cached-dns.lookup' const lookup = createCachedLookup() lookup('example.net', { all: true, family: 0 }, (error, result) => { if (error != null) { return console.warn(error) } console.log(result) }) ``` Or it can be used to replace the native implementation and speed up the whole app: ```js // assign our cached implementation to dns.lookup const restore = createCachedLookup().patchGlobal() // to restore the previous implementation restore() ``` ## Contributions Contributions are _very_ welcomed, either on the documentation or on the code. You may: - report any [issue](https://github.com/vatesfr/xen-orchestra/issues) you've encountered; - fork and create a pull request. ## License [ISC](https://spdx.org/licenses/ISC) © [Vates SAS](https://vates.fr)