Introduction to is-reachable

The is-reachable package is an efficient tool for network reachability checks. It helps developers quickly determine if a host or service is reachable, making it an essential utility for network-related applications.

Basic Usage

To get started with is-reachable, you first need to install it using npm:

npm install is-reachable

Once installed, you can use it in your JavaScript or TypeScript projects:

const isReachable = require('is-reachable');

(async () => {
  console.log(await isReachable('google.com')); // true
})();

Advanced Usage

You can specify different schemes to check various services such as HTTP, HTTPS, FTP, and more:

(async () => {
  console.log(await isReachable('http://google.com'));  // true
  console.log(await isReachable('https://google.com')); // true
  console.log(await isReachable('ftp://example.com'));  // false
})();

Error Handling

Handling errors and exceptions is crucial for robust applications. Here is how you can handle errors with is-reachable:

(async () => {
  try {
    const reachable = await isReachable('invalid-url');
    console.log(reachable);
  } catch (error) {
    console.error('Error:', error);
  }
})();

App Example

Below is a simple app example that checks the reachability of several services and logs the results:

const isReachable = require('is-reachable');

(async () => {
  const services = [
    'http://google.com',
    'https://github.com',
    'ftp://example.com'
  ];

  for (const service of services) {
    const reachable = await isReachable(service);
    console.log(`${service} is ${reachable ? 'reachable' : 'not reachable'}`);
  }
})();