mongodb-memory-server

Start an in-memory MongoDB server

This code demonstrates how to start an in-memory MongoDB server using mongodb-memory-server and connect to it using Mongoose. The server runs entirely in memory, making it fast and ideal for testing.

const { MongoMemoryServer } = require('mongodb-memory-server');
const mongoose = require('mongoose');

(async () => {
  const mongod = new MongoMemoryServer();
  const uri = await mongod.getUri();

  await mongoose.connect(uri, { useNewUrlParser: true, useUnifiedTopology: true });
  console.log('MongoDB in-memory server started');

  // Your code here

  await mongoose.disconnect();
  await mongod.stop();
})();

Use with Jest for testing

This code shows how to integrate mongodb-memory-server with Jest for testing. It sets up the in-memory MongoDB server before all tests and tears it down after all tests, ensuring a clean state for each test run.

const { MongoMemoryServer } = require('mongodb-memory-server');
const mongoose = require('mongoose');

let mongod;

beforeAll(async () => {
  mongod = new MongoMemoryServer();
  const uri = await mongod.getUri();
  await mongoose.connect(uri, { useNewUrlParser: true, useUnifiedTopology: true });
});

afterAll(async () => {
  await mongoose.disconnect();
  await mongod.stop();
});

// Your tests here

Create and use collections

This code demonstrates how to create and use collections with mongodb-memory-server. It defines a Mongoose model, saves a document, and retrieves all documents from the collection.

const { MongoMemoryServer } = require('mongodb-memory-server');
const mongoose = require('mongoose');

(async () => {
  const mongod = new MongoMemoryServer();
  const uri = await mongod.getUri();

  await mongoose.connect(uri, { useNewUrlParser: true, useUnifiedTopology: true });

  const Cat = mongoose.model('Cat', { name: String });
  const kitty = new Cat({ name: 'Zildjian' });
  await kitty.save();
  console.log('Cat saved:', kitty);

  const cats = await Cat.find();
  console.log('All cats:', cats);

  await mongoose.disconnect();
  await mongod.stop();
})();