Node.js Prometheus client with ease •

This module allow you to simply expose Node.js metrics, can expose route status code metrics and give an easy way of expose metrics.

This module is based on the siimon/prom-client module.

Enable the metrics

To activate the metrics, you must call the initPrometheus method. This method require an express application:

const express = require('express');
const { initPrometheus } = require('wed-config-nodejs-prometheus');

const app = express();

initPrometheus(app);

By doing it, all routes status codes will be gathered with the default Node.js ones.

You can disable routes status codes or default Node.js ones by passing some options on the initialization :

initPrometheus(app, {
  collectDefaultMetrics: false,
  addRouteMetrics: false,
});

Create metrics

Three metrics are currently available and exposed on the same package:

• Counter via the getCounter method,
• Gauge via the getGauge method,
• Histogram via the getHistogram method,
• Summary via the getSummary method.

Every getter need a name, the name will automatically be cleaned and snake_case formatted to fit the Prometheus requirements.

const { getCounter, getHistogram, getSummary } = require('wed-config-nodejs-prometheus');

const myCounter = getCounter("This is my counter");
myCounter.inc();