Utility for identifying slow queries in Mongo

Usage no npm install needed!

<script type="module">
  import mongoSlowQueries from '';



A module for pulling slow queries from Mongo, tagged with metadata as well.


$ npm install mongo-slow-queries



To use mongo-slow-queries you just need to provide a Mongo DB reference when creating an instance:

const mongojs = require('mongojs');
const MongoSlowQueryChecker = require('mongo-slow-queries');

let db = mongojs('mongodb://localhost:27017/admin');
let slowQueries = new MongoSlowQueryChecker({ db });

If the db object has an adminCommand method, it need not be a reference to the admin database.

Querying for slow queries

Querying for slow queries is then as simple as calling get:

slowQueries.get((err, queries) => {
  if (err) {
    console.log('Failed to retrieve slow queries: ' + queries);
  } else {
    console.log('slow queries: ' + JSON.stringify(queries));

Query duration threshold

By default, mongo-slow-queries only returns queries that are currently running that have already taken greater than five seconds to run. If you wish to use a different threshold value, simply pass it in when you construct the Mongo slow query checker:

let slowQueries = new MongoSlowQueryChecker({
  queryThreshold: 2 // The unit of time is in seconds.


  • 1.0.1 Fix which query we fingerprint.
  • 1.0.0 Initial release.