Mongoose.js: remove collection or DB

Is it possible to remove collection or entire db using mongoose.js?

Yes, although you do it via the native MongoDB driver and not Mongoose itself. Assuming a required, connected, mongoose variable, the native Db object is accessible via mongoose.connection.db, and that object provides dropCollection and dropDatabase methods.

// Drop the 'foo' collection from the current database
mongoose.connection.db.dropCollection('foo', function(err, result) {...});

// Drop the current database
mongoose.connection.db.dropDatabase(function(err, result) {...});

This can now be done in Mongoose.

MyModel.collection.drop();

Hat tip: https://github.com/Automattic/mongoose/issues/4511

For those that are using the mochajs test framework and want to clean all db collections after each test, you can use the following which uses async/await:

afterEach(async function () {
  const collections = await mongoose.connection.db.collections()

  for (let collection of collections) {
    await collection.remove()
  }
})

Mongoose references the connection on every model. So, you may find it useful to also drop the DB or collection off of an individual model.

For example:

// Drop the 'foo' collection from the current database
User.db.dropCollection('foo', function(err, result) {...});

// Drop the current database
User.db.dropDatabase(function(err, result) {...});

For 5.2.15 version of Mongoose + Mocha tests usage where you need to drop all collections before each test.

beforeEach(async () => {
     const collections = await mongoose.connection.db.collections();

     for (let collection of collections) {
          // note: collection.remove() has been depreceated.        
          await collection.deleteOne(); 
     }
});

If want to drop collection after tests and your test were running in a docker container:

mongoose = require("mongoose");
...
afterAll(async () => {
  const url = 'mongodb://host.docker.internal:27017/my-base-name';
  await mongoose.connect(url)
  await mongoose.connection.collection('collection-name').drop()
})

I dropped my collections using Connection.prototype.dropCollection()

const conn = mongoose.createConnection('mongodb://localhost:27017/mydb');
conn.dropCollection("Collection_name",callbacks);