@0q/embedded-mongodb

The MongoDB Node.js driver over an embedded MongoDB engine: the real server code, running inside your process against a local directory. No server, no port.

const { MongoClient } = require('@0q/embedded-mongodb');

const client = new MongoClient('mongodb_embedded://./data');
const items = client.db('app').collection('items');
await items.insertOne({ name: 'embedded' });
console.log(await items.findOne());
await client.close();

MongoClient is the driver's own class with one addition: a mongodb_embedded://<directory> (or mongodb+embedded://) address opens the directory in-process instead of connecting to a server. Any other address is handed to the driver untouched. The mongodb package is a peer dependency for this class; the lower layer needs nothing:

const { open } = require('@0q/embedded-mongodb');

const embedded = await open('./data');
// embedded.uri is a mongodb:// address any driver in this process can connect to.
await embedded.close();

Only one engine may be open per process. Linux x64, Linux arm64 and macOS arm64 are the supported platforms. Authentication, TLS, compression, sessions, transactions and change streams are not supported.

Part of embedded-mongo, which has the full documentation, the Python binding and the engine itself. Licensed under the SSPL-1.0, as MongoDB is.