prometheus-metrics-middleware

Prometheus metrics middleware for NodeJS apps on top of prom-client.

Install

npm i prometheus-metrics-middleware --save

yarn add prometheus-metrics-middleware

Usage

import express from 'express'
import metricsMiddleware from 'prometheus-metrics-middleware'

const app = express()

app.use(
  metricsMiddleware({
    metricsPath: '/metrics',
    metricsPrefix: 'my_sample_app_',
    timeout: 1000 * 60,
  })
)

app.get('/healthcheck', (req: Request, res: Response) => {
  ...
})

app.listen(3000)

Options

Name	Default	Description
metricsPath	/metrics	Route to fetch metrics from prometheus
metricsPrefix	-	Prefix for metric names
timeout	-	Timeout (ms) for how often the probe should be fired

Access metrics

Prometheus format

curl http[s]://[host]:[port]/metrics

JSON format

curl http[s]://[host]:[port]/metrics.json