Monk Middleware Wait for Connection

0.2.0 verified Sat Apr 25 auth: no javascript

A thin middleware for the Monk MongoDB driver that defers all database operations until the underlying MongoDB connection is fully established. Version 0.2.0 is stable, released infrequently, and is part of the Monk middleware ecosystem. It prevents race conditions by queueing queries before the connection is ready. Unlike manual connection checks, this transparently applies to all collections registered in Monk.

Common errors

error TypeError: db.addMiddleware is not a function ↓

cause Attempting to call addMiddleware on a Monk instance that does not support it (e.g., older Monk version or incorrect import).

fix

Ensure you are using Monk version 5.x or later (where middleware was introduced). Upgrade monk to >=5.0.0.

error Error: Cannot find module 'monk-middleware-wait-for-connection' ↓

cause Package not installed or not in node_modules.

fix

Run 'npm install monk-middleware-wait-for-connection' to add the package.

Warnings

gotcha Middleware must be added before any operations are performed on collections, otherwise those operations may execute before the connection is ready. ↓

fix Ensure db.addMiddleware(waitForConnection) is called immediately after creating the Monk instance, before any collection.get() or queries.

gotcha This middleware only works with Monk's middleware system. If you bypass Monk and access the native MongoDB driver directly, the middleware will not be applied. ↓

fix Always use Monk's API (db.get(), collection.find(), etc.) to benefit from the middleware.

Install

npm install monk-middleware-wait-for-connection

yarn add monk-middleware-wait-for-connection

pnpm add monk-middleware-wait-for-connection

Imports

default

wrong

const waitForConnection = require('monk-middleware-wait-for-connection')

correct

import waitForConnection from 'monk-middleware-wait-for-connection'

Default export. CommonJS require works but ESM is preferred in modern environments.

Quickstart

Shows how to apply the wait-for-connection middleware to a Monk database instance, ensuring that subsequent collection operations are queued until the MongoDB connection is established.

import monk from 'monk';
import waitForConnection from 'monk-middleware-wait-for-connection';

const db = monk('localhost/mydb');

db.addMiddleware(waitForConnection);

const collection = db.get('mycollection');

// This operation will wait until the connection is ready
collection.insert({ name: 'test' })
  .then(doc => console.log('Inserted:', doc))
  .catch(err => console.error('Error:', err));