Software Alternatives, Accelerators & Startups

Moleculer VS ExpressJS

Compare Moleculer VS ExpressJS and see what are their differences

Moleculer logo Moleculer

Fast & modern microservices framework for Node.js.

ExpressJS logo ExpressJS

Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple
  • Moleculer Landing page
    Landing page //
    2021-12-21
  • ExpressJS Landing page
    Landing page //
    2021-10-14

Moleculer features and specs

  • Microservices Architecture
    Moleculer provides an efficient microservices framework which allows developers to build robust and scalable distributed systems effortlessly.
  • Out-of-the-Box Features
    Moleculer offers an extensive array of built-in features such as service discovery, load balancing, fault tolerance, and more, reducing the need for third-party integrations.
  • Ease of Use
    Its straightforward API and comprehensive documentation make it easy to learn and implement, even for developers who are new to microservices.
  • Pluggable Transport Layer
    Supports different transporters such as NATS, MQTT, Kafka, and Redis, giving flexibility in how services communicate with each other.
  • Performance
    Designed for high performance, Moleculer can handle a large number of requests efficiently, making it suitable for production-level applications.

Possible disadvantages of Moleculer

  • Complexity in Large Systems
    As with any microservices framework, managing a large number of services can become complex and may require robust monitoring and orchestration tools.
  • Learning Curve
    While Moleculer is easy to start with, mastering it and understanding all its features and best practices may require time.
  • Community and Ecosystem
    Compared to more established frameworks, Moleculer may have a smaller community and ecosystem which can affect the availability of third-party plugins or modules.
  • Dependency Management
    Ensuring compatibility between different versions of services and third-party libraries can be challenging, especially when services are updated independently.
  • Debugging and Error Handling
    Distributed systems can be more complex to debug, and although Moleculer provides tools for this, it may still require extra effort compared to monolithic applications.

ExpressJS features and specs

  • Fast Setup
    ExpressJS provides a minimal and flexible framework that allows rapid setup and development of web and mobile applications.
  • Middleware Support
    ExpressJS has a robust middleware system, allowing developers to add reusable functions to the request-handling pipeline.
  • Extensibility
    ExpressJS is highly extensible through third-party libraries and built-in functionality, catering to the needs of various applications.
  • Performance
    Due to its minimalist core, ExpressJS provides efficient performance and is capable of handling a high number of requests per second.
  • Community and Ecosystem
    A large and active community provides extensive documentation, support, and a wide array of open-source packages to extend functionality.
  • Flexibility
    Compared to full-stack frameworks, ExpressJS gives developers the freedom to structure their applications as they see fit.
  • Compatibility
    ExpressJS works seamlessly with various template engines, databases, and other frameworks, making it versatile for different project requirements.

Possible disadvantages of ExpressJS

  • Minimalist Core
    The minimalist nature of ExpressJS may require additional time and effort to integrate required plugins and libraries for specific features.
  • Learning Curve
    While ExpressJS is straightforward, mastering the middleware pattern and effective usage can have a learning curve for new developers.
  • Callback Hell
    Developers can encounter 'callback hell' due to nested callback functions, though this can be mitigated using Promises and async/await in modern JavaScript.
  • Lack of Convention
    Unlike opinionated frameworks, ExpressJS lacks conventions, which can lead to inconsistent code structure and maintenance challenges across different projects.
  • Security
    ExpressJS does not have built-in security features and relies on third-party solutions, requiring developers to be vigilant about applying best security practices.
  • Scalability
    While ExpressJS can handle high traffic, building and maintaining a highly scalable application might require significant additional effort, particularly in terms of codebase organization and resource management.

Moleculer videos

MoleculeR review

ExpressJS videos

No ExpressJS videos yet. You could help us improve this page by suggesting one.

Add video

Category Popularity

0-100% (relative to Moleculer and ExpressJS)
Developer Tools
7 7%
93% 93
JavaScript Framework
2 2%
98% 98
Web Frameworks
4 4%
96% 96
Cloud Computing
100 100%
0% 0

User comments

Share your experience with using Moleculer and ExpressJS. For example, how are they different and which one is better?
Log in or Post with

Reviews

These are some of the external sources and on-site user reviews we've used to compare Moleculer and ExpressJS

Moleculer Reviews

We have no reviews of Moleculer yet.
Be the first one to post

ExpressJS Reviews

Top JavaScript Frameworks in 2025
Express.JS is used to create Restful APIs, which is useful for accepting requests from the front end and sending the appropriate response. Express.JS supports Node.js, which is one of the best reasons developers choose to use it. Moreover, debugging becomes faster and helps in finding errors in less time.
Source: solguruz.com
The 20 Best Laravel Alternatives for Web Development
Express.js — or Express for the cool cats — is Node.js’s minimalist wingman. It’s the train tracks for your web app, setting the path, defining the stops, but letting you drive the engine.
Top 9 best Frameworks for web development
The best frameworks for web development include React, Angular, Vue.js, Django, Spring, Laravel, Ruby on Rails, Flask and Express.js. Each of these frameworks has its own advantages and distinctive features, so it is important to choose the framework that best suits the needs of your project.
Source: www.kiwop.com
9 Best JavaScript Frameworks to Use in 2023
Additionally, Express.js v4 now comes with built-in middleware for handling AJAX requests from the client side, making it even easier to get started without having to worry about 3rd party libraries. Express.js is a great tool for quickly building out web applications and APIs in Node.js.
Source: ninetailed.io
JavaScript: What Are The Most Used Frameworks For This Language?
Express.JS is a popular open-source web application framework for Node.JS, which is a server-side JavaScript runtime environment. Express.JS provides a simple, flexible and scalable way to build web applications and APIs using Node.JS. It is known for its minimalist and unimposing approach, which means it provides a basic set of features and tools but allows developers to...
Source: www.bocasay.com

Social recommendations and mentions

Based on our record, ExpressJS seems to be a lot more popular than Moleculer. While we know about 466 links to ExpressJS, we've tracked only 14 mentions of Moleculer. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

Moleculer mentions (14)

  • Make microservices look like monoliths
    My goto for this kind of task is moleculer: https://moleculer.services/ Fast, battle tested, vue2-like approach, great documentation, good community. The automatic indipendent-scalability as an option is usually the main selling point of these solutions, but honestly I think the real pro is the "composition" approach, which is essential if you want to keep a clean and well-organized codebase. On this regard, I... - Source: Hacker News / almost 2 years ago
  • How to Import/Reference a Microservice from another one
    If you’re using k8s, check out https://moleculer.services and this would likely solve what you’re looking for. Source: about 2 years ago
  • Node JS Microservice Frameworks for Developing Scalable Web Apps.
    Molecular – Progressive Microservices Framework for Node.js. Source: about 2 years ago
  • First time building microservice-based application
    While you’re delving into microservices, check out Moleculer https://moleculer.services. Source: over 2 years ago
  • if Nodejs does not meant for CPU intensive tasks so I think it's better to avoid it from the beginning
    I almost can’t believe I haven’t seen it mentioned here before, but adding Moleculer into your node project (if it’s clustered/k8s’d) will literally solve many single threaded problems, not to mention tons of other scalability issues. https://moleculer.services/. Source: over 2 years ago
View more

ExpressJS mentions (466)

  • Reusable API proxy in just a few lines of JavaScript
    The basis of my small API proxy is the NPM package http-proxy-middleware from Steven Chim, which I utilized to build a system that can be used via configuration for various endpoints and that runs on a server under the Node.js framework Express. - Source: dev.to / 9 days ago
  • How To Fetch Image From Database and Display In React JS
    Express Documentation This site has comprehensive guides on setting up routes, handling requests, and working with middleware in Express. - Source: dev.to / about 1 month ago
  • Show HN: MetroJS – JavaScript HTTPS Client with Middleware
    Hi, I've made a javascript https client, based on the browsers Fetch API, with added middleware support. Prebuilt middleware includes JSON, OAuth2.1 and OIDC (OpenID Connect). Differences with for example Axios, is that middleware can capture both request and response in a single function. Middleware is stackable. It is also completely backwards compatible with the Fetch API. Direct inspiration came from Express... - Source: Hacker News / about 1 month ago
  • Which Go Web Backend Framework Is Right for Your Next Project? A Detailed Analysis of Features and Performance
    Fiber draws direct inspiration from Express.js, a widely used web framework in the Node.js ecosystem. It is built on top of Fasthttp, known for its exceptional speed and low memory usage. - Source: dev.to / about 2 months ago
  • How To Fetch (Get) HTML From Server 🛤️
    To do this, let's create an API route, through which we will receive HTML from the server. For the backend part, we will use Node.js. The framework on which we will do this is Express.js. It is one of the most popular today and it is perfect for the task we are solving. First, we specify the controller that will process the HTML:. - Source: dev.to / about 2 months ago
View more

What are some alternatives?

When comparing Moleculer and ExpressJS, you can also consider the following products

Nest.js - A progressive Node.js framework for building efficient, reliable and scalable server-side applications.

Node.js - Node.js is a platform built on Chrome's JavaScript runtime for easily building fast, scalable network applications

KintoHub - A modern fullstack app platform

Ruby on Rails - Ruby on Rails is an open source full-stack web application framework for the Ruby programming...

Loopback by RogueAmoeba - Get all the power of a high-end studio mixing board, right inside your Mac!

Laravel - A PHP Framework For Web Artisans