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2.1.8 • Public • Published

Just Mongo 2.1


Simple and fast wrapper for MongoDB.

💪 Motivation

Less code and more action.

Just Mongo allows you to use a simplified API. Inside, we try to use minimalistic solutions that do not steal your time.

You choose the possibilities of the library, and nothing more.

Speed ➵

We ran along with Mongoose, and overtook him in all the races!

Test Just-Mongo 2 Mongoose
Connection 4 46
Insert (5k docs) 366 3686
Find 6 10

...time in ms.

All tests are in directory: test/speed-test.

Feature compatibility

Just-Mongo 2 has new possibilities of mongodb. Please, note this:

Switching from v1.x

The following should be know when upgrading version:

  • Better, update old models to new json schemes.
  • Old models will work in limited functionality. Stop working: isValid.


$ npm i just-mongo -S


$ npm test


Create models

Limited version:

const models = {
  users: {
    name: {
      type: String,
    age: Number,
    id: {
      type: Number,
      required: true
    ban: {
      type: Boolean,
      default: false

Flexible version:

const models = {
  users: {
    $jsonSchema: {
      bsonType: 'object',
      properties: {
        name: {
          type: 'string'
        age: {
          type: 'number'
        id: {
          type: 'number'
        ban: {
          type: 'boolean',
          default: false
      required: ['name', 'id']

The default values are not supported by the database itself, the values are set before creating the records. Do not use the default values in schemes in allOf, anyOf, oneOf, .etc.

Create connection

Parameter Type Requried Default
models object no -
log false, true, error, warn, info, verbose, debug, silly no false
db string yes ''
host string no localhost
user string no ''
password string no ''
port number/string no 27017
  • log — Set the logging.
const JustMongo = require('just-mongo');
const mongo = new JustMongo({
  db: 'database'
}, (err, done) => {
  if (err) {
  } else {

If you need create multi connections, read this doc.


const Users = mongo.collection('users');

Collection [native]

const Users = mongo.collection('users').collection;

Such a method should be used if you are sure that there is already a connection to the MongoBD. If there is no such certainty, then use the method described below.

const Users = mongo.collection('users');
await Users.native((collection, resolve, reject) => {
  // use collection.MethodFromNative
  // сomplete the function using resolve or reject

This method will be executed after connecting to the database. After that, you can use the first method.


Parameter Type Requried Default
document object/list<object> yes -
options object no null
// insert one document
await Users.insert({ user_id: 1 }, { serializeFunctions: true });
// insert several documents
await Users.insert([
  { user_id: 1 }, 
  { user_id: 2 }


Parameter Type Requried Default
filter object yes -
document object yes -
options object no null
await Users.updateOne({ user_id: 1 }, {
  $set: {
    first_name: 'Mikhail'
}, { serializeFunctions: false });
await Users.updateMany({ first_name: 'Mikhail' }, {
  $set: {
    age: 15
}, { w: 1 });

Or use methods editOne and editMany to avoid specifying $set for each request.


Parameter Type Requried Default
filter object yes -
options object no null
await Users.deleteOne({ first_name: 'Anton' }, { w: 1 });
await Users.deleteMany({ age: 10 }, { wtimeout: 25 });


Parameter Type Requried Default
filter object yes -
options object no null
const item = await Users.findOne({ age: 15 }, { limit: 5 });
const items = await Users.find({});
const itemsCount = await Users.count({ age: 15 }, { maxTimeMS: 2500 });

You can configure additional logic for the contents of documents.

Searching for random entries
Parameter Type Requried Default
filter object no null
count number no 5
options object no null


  • project — control the display of fields as a result.
const items = await Users.findRandom({ age: 25 }, 2, {
  project: {
    id: 1,
    name: 1,
    _id: 0

Getting updates

To constantly receive new data from one or more collections at once, you can use our listening solution. Open doc.

Join engine

If you need joined collection, use join engine.

There's some cool examples too.

Native connections

In case you need to create your own flexible connection using mongodb native, read this doc.





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