Downtime Detector

Simple module that allows you to easily monitor websites, and create a status page.

Still a work in progress and not ready for prod. Check back soon!

Getting started

Instalation

With npm :

npm install downtime-detector

With yarn :

yarn add downtime-detector

Usage

Import the module :

CommonJS syntax :

const { DownDetector } = require("downtime-detector");

Module ES syntax :

import { DownDetector } from "downtime-detector";

Create a new DownDetector with an URL (string) as a parameter :

const Monitor = new DownDetector("https://website-example.com", options);

Options

Object

| PARAMETER | TYPE | OPTIONAL | DEFAULT | DESCRIPTION | | --------- | -------------------------------------- | -------- | --------- | ---------------------------------------------- | | interval | number | ✓ | 3000ms | Interval for check site | | retries | number | ✓ | 3 | Retries before create an outage | | timeout | number | ✓ | 3000ms | Maximum waiting time before creating an outage | | headers | { [key: string]: string } | undefined | ✓ | undefined | Additional headers to be attached to requests |

Events

up

Emitted when site is online

Parameter : status

| PROPERTIES | TYPE | DESCRIPTION | | ---------- | ------ | ------------------------- | | statusCode | number | The response status code | | statusText | string | The response status text | | url | string | The url of website | | ping | number | The ping latency (in ms) | | Uptime | number | Availability time (in ms) |

outage

Emitted when site is have an outage

Parameter : status

| PROPERTIES | TYPE | DESCRIPTION | | -------------- | ------ | --------------------------- | | statusCode | number | The response status code | | statusText | string | The response status text | | url | string | The url of website | | ping | number | The ping latency (in ms) | | unavailability | number | Unavailability time (in ms) |

error

Emitted when an error occurred

Parameter : error

Properties

available

Return true if site is available else return false

Return :

Boolean

ping

Return the last ping (in ms) or null if it doesn't exist

Return :

Number or Null

uptime

Return the uptime (in ms) or null if it doesn't exist

Return :

Number or Null

unavailability

Return the unavailability or null if it doesn't exist

Return :

Number or Null

Methods

start()

Start the monitoring of website

Return :

Boolean

Monitor.start();

restart()

Restart the monitoring of website

Return :

Boolean

Monitor.restart();

stop()

Stop the monitoring of website

Return :

Boolean

Monitor.stop();

setInterval(newInterval)

Change the interval check

Params :

newInterval : The new interval in ms (number)

Return :

Boolean

Monitor.setInterval(200);

setURL(newURL)

Change the ping endpoint

Params :

newURL : The new url (string).

Return :

Boolean

Monitor.setURL("https://www.exempla-website.com");

Example

const { DownDetector } = require("downtime-detector");

const Monitor = new DownDetector("https://website-example.com", {
  interval: 3000,
  timeout: 5000,
});

Monitor.start();
console.log(Monitor.infos);

Monitor.on("outage", (outage) => {
  console.log(outage);
});

Monitor.on("up", (up) => {
  console.log(up);
});
Monitor.on("error", (error) => {
  console.log(error);
});