prometheus-query

Welcome to prometheus-query 👋

A Javascript client for Prometheus query API.

✨ Features

• Thin & minimal low-level HTTP client to interact with Prometheus's API
• Works both on the browser and node.js
• UMD compatible, you can use it with any module loader
• Supports query and admin APIs

⚠️ This library does not export metrics. Please use prom-client instead.

For building shiny Charts, you may like this chartjs plugin: samber/chartjs-plugin-datasource-prometheus.

^{Sponsored by:}

Cloud-native search engine for observability - An OSS alternative to Splunk, Elasticsearch, Loki, and Tempo.

🚀 Install

NodeJS

npm install prometheus-query

Upgrade from v2 to v3

• prometheus-query-js has been recoded into Typescript.
• Type definitions.
• API update:
  • PrometheusQuery is not the default export anymore.
  • PrometheusQuery has been renamed as PrometheusDriver.
  • See examples

Browser

<script src="https://cdn.jsdelivr.net/npm/prometheus-query/dist/prometheus-query.umd.min.js"></script>

<script type="application/javacript">
	const prom = new Prometheus.PrometheusDriver(...);
</script>

💡 Quick start

import { PrometheusDriver } from 'prometheus-query';

const prom = new PrometheusDriver({
    endpoint: "https://prometheus.demo.do.prometheus.io",
    baseURL: "/api/v1" // default value
});

Instant query

// last `up` value
const q = 'up{instance="demo.do.prometheus.io:9090",job="node"}';
prom.instantQuery(q)
    .then((res) => {
        const series = res.result;
        series.forEach((serie) => {
            console.log("Serie:", serie.metric.toString());
            console.log("Time:", serie.value.time);
            console.log("Value:", serie.value.value);
        });
    })
    .catch(console.error);

Output:

Serie: up{instance="prometheus.demo.do.prometheus.io:9100", job="node"}
Time: Sun Feb 16 2020 18:33:59 GMT+0100 (Central European Standard Time)
Value: 1

Range query

// up during past 24h
const q = 'up';
const start = new Date().getTime() - 24 * 60 * 60 * 1000;
const end = new Date();
const step = 6 * 60 * 60; // 1 point every 6 hours

prom.rangeQuery(q, start, end, step)
    .then((res) => {
        const series = res.result;
        series.forEach((serie) => {
            console.log("Serie:", serie.metric.toString());
            console.log("Values:\n" + serie.values.join('\n'));
        });
    })
    .catch(console.error);

Output:

Serie: up{instance="prometheus.demo.do.prometheus.io:9090", job="prometheus"}
Values:
Sat Feb 15 2020 18:21:47 GMT+0100 (Central European Standard Time): 1
Sun Feb 16 2020 00:21:47 GMT+0100 (Central European Standard Time): 1
Sun Feb 16 2020 06:21:47 GMT+0100 (Central European Standard Time): 1
Sun Feb 16 2020 12:21:47 GMT+0100 (Central European Standard Time): 1
Sun Feb 16 2020 18:21:47 GMT+0100 (Central European Standard Time): 1

Serie: up{instance="prometheus.demo.do.prometheus.io:9093", job="alertmanager"}
Values:
Sat Feb 15 2020 18:21:47 GMT+0100 (Central European Standard Time): 1
Sun Feb 16 2020 00:21:47 GMT+0100 (Central European Standard Time): 1
Sun Feb 16 2020 06:21:47 GMT+0100 (Central European Standard Time): 1
Sun Feb 16 2020 12:21:47 GMT+0100 (Central European Standard Time): 1
Sun Feb 16 2020 18:21:47 GMT+0100 (Central European Standard Time): 1

Serie: up{instance="prometheus.demo.do.prometheus.io:9100", job="node"}
Values:
Sat Feb 15 2020 18:20:51 GMT+0100 (Central European Standard Time): 1
Sun Feb 16 2020 00:20:51 GMT+0100 (Central European Standard Time): 1
Sun Feb 16 2020 06:20:51 GMT+0100 (Central European Standard Time): 1
Sun Feb 16 2020 12:20:51 GMT+0100 (Central European Standard Time): 1
Sun Feb 16 2020 18:20:51 GMT+0100 (Central European Standard Time): 1

List series matching query

const match = 'up';
const start = new Date().getTime() - 24 * 60 * 60 * 1000;
const end = new Date();

prom.series(match, start, end)
    .then((res) => {
        console.log('Series:');
        console.log(res.join('\n'));
    })
    .catch(console.error);

Output:

up{instance="demo.do.prometheus.io:9090", job="prometheus"}
up{instance="demo.do.prometheus.io:9093", job="alertmanager"}
up{instance="demo.do.prometheus.io:9100", job="node"}

List all active alerts

prom.alerts()
    .then(console.log)
    .catch(console.error);

Output:

[
  Alert {
    activeAt: 2019-11-14T20:04:36.629Z,
    annotations: {},
    labels: { alertname: 'ExampleAlertAlwaysFiring', job: 'alertmanager' },
    state: 'firing',
    value: 1
  },
  Alert {
    activeAt: 2019-11-14T20:04:36.629Z,
    annotations: {},
    labels: { alertname: 'ExampleAlertAlwaysFiring', job: 'node' },
    state: 'firing',
    value: 1
  },
  Alert {
    activeAt: 2019-11-14T20:04:36.629Z,
    annotations: {},
    labels: { alertname: 'ExampleAlertAlwaysFiring', job: 'prometheus' },
    state: 'firing',
    value: 1
  },
  Alert {
    activeAt: 2019-11-14T20:04:36.629Z,
    annotations: {},
    labels: { alertname: 'ExampleAlertAlwaysFiring', job: 'pushgateway' },
    state: 'firing',
    value: 1
  }
]

Authenticated query

Using basic auth:

new PrometheusDriver({
    endpoint: "https://prometheus.demo.do.prometheus.io",
    auth: {
        username: 'foo',
        password: 'bar'
    }
});

Using cookies:

new PrometheusDriver({
    endpoint: "https://prometheus.demo.do.prometheus.io",
    withCredentials: true
});

Proxy

new PrometheusDriver({
    endpoint: "https://prometheus.demo.do.prometheus.io",
    proxy: {
        host: 'proxy.acme.com',
        port: 8080
    }
});

Hook HTTP requests and responses

new PrometheusDriver({
    endpoint: "https://prometheus.demo.do.prometheus.io",
    proxy: {
        host: 'proxy.acme.com',
        port: 8080
    },
    requestInterceptor: {
        onFulfilled: (config: AxiosRequestConfig) => {
            return config;
        },
        onRejected: (error: any) => {
            return Promise.reject(error.message);
        }
    },
    responseInterceptor: {
        onFulfilled: (res: AxiosResponse) => {
            return res;
        },
        onRejected: (error: any) => {
            return Promise.reject(error.message);
        }
    }
});

🔐 Security advisory

If you open a Prometheus instance on Internet, it would be a good idea to block some routes.

Start by blocking /api/v1/admin. I'm pretty sure allowing only /api/v1/query and /api/v1/query_range will match your needs.

Also don't use Prometheus as a multitenant timeseries database!

At your own risk... 😘

🤝 Contributing

The Prometheus Query client is open source and contributions from the community (you!) are welcome.

There are many ways to contribute: writing code, documentation, reporting issues...

How-to

Author

👤 Samuel Berthe

• Twitter: @samuelberthe
• Github: @samber

💫 Show your support

Give a ⭐️ if this project helped you!

📝 License

Copyright © 2020 Samuel Berthe.

This project is MIT licensed.