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ExpressJS VS Mockoon

Compare ExpressJS VS Mockoon and see what are their differences

Flagsmith
Flagsmith lets you manage feature flags and remote config across web, mobile and server side applications. Deliver true Continuous Integration. Get builds out faster. Control who has access to new features. We're Open Source. featured
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ExpressJS logo ExpressJS

Sinatra inspired web development framework for node.js -- insanely fast, flexible, and simple

Mockoon logo Mockoon

Mockoon is the easiest and quickest way to design and run mock REST APIs. No remote deployment, no account required, free and open-source.
  • ExpressJS Landing page
    Landing page //
    2021-10-14
  • Mockoon Desktop application main view
    Desktop application main view //
    2025-01-20

ExpressJS

Website
expressjs.com
Pricing URL
-
$ Details
Platforms
-
Release Date
-
Edit details

Mockoon

Website
mockoon.com
Pricing URL
Official Mockoon Pricing
$ Details
paid Free Trial $15.0 / Monthly (5 API mocks synchronized accross your devices, 1 mock deployed)
Platforms
Windows Linux Mac
Release Date
2017 September
Startup details
Country
Luxembourg
Employees
1 - 9
Edit details

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.

Mockoon features and specs

  • User-Friendly Interface
    Mockoon offers an intuitive and easy-to-navigate graphical user interface, making it accessible even for those who are not deeply familiar with API mocking.
  • Quick Setup
    Enables quick creation and running of mock servers locally, allowing developers to simulate API responses without complex configuration.
  • Open Source
    As an open-source tool, Mockoon benefits from community contributions and transparency, which can lead to faster bug fixes and feature enhancements.
  • Cross-Platform Support
    Available on multiple platforms including Windows, macOS, and Linux, offering flexibility for diverse development environments.
  • Advanced Features
    Supports advanced features like HTTPS, CORS, custom headers, and support for various response types, catering to complex API mocking needs.

Category Popularity

0-100% (relative to ExpressJS and Mockoon)

ExpressJS

Mockoon

JavaScript Framework
100 100%
JavaScript Framework
0% 0
Developer Tools
83 83%
Developer Tools
17% 17
APIs
0 0%
APIs
100% 100
Web Frameworks
100 100%
Web Frameworks
0% 0

User comments

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Reviews

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

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.
Source: tms-outsource.com
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

Mockoon Reviews

We have no reviews of Mockoon yet.
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Social recommendations and mentions

Based on our record, ExpressJS seems to be a lot more popular than Mockoon. While we know about 469 links to ExpressJS, we've tracked only 34 mentions of Mockoon. 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.

ExpressJS mentions (469)

  • Not a Middy Fan
    Express.js was created around the time callbacks were _the_ architecture in Node.js. The world, including UI, quickly found callbacks do not compose well, and void return values are hard to test because of side-effects. Promises were created so you could compose functions, but still have control where your side-effects go. This negates the need for middlewares / callbacks. - Source: dev.to / 7 days ago
  • Experimental Devvit Web Views
    The Devvit team just announced a new experimental way to build WebView based apps for Reddit. Previously only static HTML/JS/CSS could be used. With this new version, it is possible to run server-side code through Node including spinning up an Express server. - Source: dev.to / 10 days ago
  • How to Handle File Uploads with Node.js and Express - Multer Edition
    Basic knowledge of JavaScript and Express. - Source: dev.to / 13 days ago
  • 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 / 28 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 2 months ago
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Mockoon mentions (34)

  • How to Implement Mock APIs for API Testing
    Mockoon: This open-source desktop application offers a fast setup with a user-friendly interface. It excels at creating customizable responses and supports multiple environments without requiring complex configuration. Mockoon is particularly useful for local development. - Source: dev.to / about 2 months ago
  • Why Feedback Loops Matter in API Development
    Mocking: Help your front-end team discover integration or design issues Early in the API development process by mocking your API endpoints. You can either due this directly from your gateway, or use a service like Mockoon. - Source: dev.to / 3 months ago
  • Ask HN: What Are You Working On? (February 2025)
    Still working on https://mockoon.com, an open-source API mocking desktop tool, after 7 years. - Source: Hacker News / 3 months ago
  • Ask HN: Those making $500/month on side projects in 2024 – Show and tell
    I maintain https://mockoon.com, an API mocking tool for developers. I created it in 2017 and initially worked on it during my free time. I started focusing on it full-time three years ago and introduced cloud options to make the project sustainable alongside donations. - Source: Hacker News / 6 months ago
  • Thoughts on ThoughtWorks Radar 2024
    I hate mocks. I tend to work in languages which allow side-effects, and with developers who do not follow Pure Core, Imperative Shell. So anything I can do to learn more about my enemy, and how to manage it, is a good use of time, and Mockoon is another one of those mock creators. - Source: dev.to / 7 months ago
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What are some alternatives?

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

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

Beeceptor - Unblock yourself from API dependencies, and build & integrate with APIs fast. Beeceptor helps you build a mock Rest API in a few seconds.

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

WireMock - WireMock - a web service test double for all occasions.

Django - The Web framework for perfectionists with deadlines

Postman - The Collaboration Platform for API Development

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