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is-reachable
Advanced tools
Check if servers are reachable
Works in Node.js and the browser (with a bundler).
The Node.js version will do a TCP handshake with the target's port. It attempts to detect cases where a router redirects the request to itself.
The browser version is limited by the fact that browsers cannot connect to arbitrary ports. It only supports HTTP and HTTPS and the check relies on the /favicon.ico
path being present.
$ npm install is-reachable
const isReachable = require('is-reachable');
(async () => {
console.log(await isReachable('sindresorhus.com'));
//=> true
console.log(await isReachable('google.com:443'));
//=> true
})();
Returns a Promise<boolean>
which is true
if any of the targets
are reachable.
Type: string | string[]
One or more targets to check. Can either be hostname:port
, a URL like https://hostname:port
or even just hostname
. port
must be specified if protocol is not http:
or https:
and defaults to 443
. Protocols other than http:
and https:
are not supported.
Type: object
Type: number
Default: 5000
Timeout in milliseconds after which a request is considered failed.
Node.js only
FAQs
Check if servers are reachable
The npm package is-reachable receives a total of 108,367 weekly downloads. As such, is-reachable popularity was classified as popular.
We found that is-reachable demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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