Listing all collections in a mongo database within a nodejs script

In the 2.0 version of the MongoDB driver for node.js you can use listCollections to get a cursor that contains the information of all collections. You can then call toArray on the cursor to retrieve the info.

db.listCollections().toArray(function(err, collInfos) {    // collInfos is an array of collection info objects that look like:    // { name: 'test', options: {} }});

Here is a full example on how you do it with the 3.4 version of the Mongo driver for node

const MongoClient = require("mongodb").MongoClient;// Connection urlvar url = 'mongodb://localhost:27017/test';const client = new MongoClient(url, { useUnifiedTopology: true }); // { useUnifiedTopology: true } removes connection warnings;const dbName = "test";client      .connect()      .then(        client =>          client            .db(dbName)            .listCollections()            .toArray() // Returns a promise that will resolve to the list of the collections      )      .then(cols => console.log("Collections", cols))      .finally(() => client.close());

If you have access to async/await, it is much cleaner to promisify toArray on the iterator and not use a callback.

static toArray(iterator) {  return new Promise((resolve, reject) => {    iterator.toArray((err, res) => {      if (err) {        reject(err);      } else {        resolve(res);      }    });  });}

const myArray = await toArray(db.listCollections());