A module to easily create mongodb connection strings using configuration objects

Usage no npm install needed!

<script type="module">
  import mongoUriBuilder from '';



A zero dependency Node.js module to easily create MongoDB connection strings using configuration objects

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Most of the existing MongoDB libraries (e.g. the official MongoClient or Mongoose) uses connection strings to connect to your running mongo instances which most of the times is very quick and convenient. Anyway sometime you want to have your MongoDB connection details organized in a nice javascript object so that you can easily serialize it in a configuration file and be able to override some specific values in different environments (e.g. "development" or "production") without having to override the entire connection string.

With this module you can easily accomplish this goal and in general you will be able to easily generate a MongoDB connection string starting from an organized javascript object that you can manipulate as you wish.

Quick example

var mongoUriBuilder = require('mongo-uri-builder');

var connectionString = mongoUriBuilder({
    username: 'user', // or user: 'user'
    password: 'pass',
    host: 'host1',
    port: 1111,
    replicas: [
        {host: 'host2', port: 2222},
        {host: 'host3', port: 3333}
    database: 'db',
    options: {
        w: 0,
        readPreference: 'secondary'


// prints "mongodb://user:pass@host1:1111,host2:2222,host3:3333/db?w=0&readPreference=secondary"


As easy as running:

npm install --save mongo-uri-builder

Requires Node.js 8+


As shown in the previous example the module exposes just a function that accepts an optional structured object as parameter. If no parameter is given the default MongoDB://localhost will be built.

Available options:

All the options are optional and the following example describes all the available ones:

    username: 'user', // the username
    // user: 'user', // this is alternative of username
    password: 'pass', // the password
    host: 'host1', // the main host (default: "localhost")
    port: 1111, // the main port
    replicas: [ // an array of replica databases
        {host: 'host2', port: 2222}, // every replica must define an host, the port is optional
        {host: 'host3', port: 3333}
    database: 'db', // the name of the database
    options: { // an arbitrary object of connection options
        w: 0,
        readPreference: 'secondary'


Everyone is very welcome to contribute to this project. You can contribute just by submitting bugs or suggesting improvements by opening an issue on GitHub.

You can also submit PRs as long as you adhere with the code standards and write tests for the proposed changes.

Code standard

XO conventions and tools are used as code standard. You can easily check if your edits conforms the standard by running:

npm run check-style


Tape is used as default test runner. You can easily run the tests by using:

npm run tests


Covert can be used to check tests coverage by running:

npm run coverage


Licensed under MIT License. © Luciano Mammino.