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ExpressJS VS D2

Compare ExpressJS VS D2 and see what are their differences

ExpressJS logo ExpressJS

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

D2 logo D2

Modern diagram scripting language to turn text to diagrams
  • ExpressJS Landing page
    Landing page //
    2021-10-14
  • D2 Landing page
    Landing page //
    2023-07-25

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.

D2 features and specs

No features have been listed yet.

Analysis of ExpressJS

Overall verdict

  • ExpressJS is a highly recommended option for building web applications with Node.js. Its simplicity, extensive middleware options, and strong community support make it a solid choice for both beginners and experienced developers. However, it might not be the best fit for highly complex applications that require more opinionated frameworks with more built-in features.

Why this product is good

  • ExpressJS is a minimalist and flexible web application framework for Node.js. It provides a robust set of features for building web and mobile applications, making it a popular choice among developers.
  • It offers a thin layer of fundamental web application features, without obscuring Node.js features that developers use regularly.
  • ExpressJS has a large ecosystem of middleware to handle various tasks such as security, session management, and file uploads, which simplifies the development process.
  • It's known for its fast learning curve, which makes it particularly advantageous for developers who are new to backend web development but familiar with JavaScript.

Recommended for

  • Developers looking for a lightweight and flexible web framework for Node.js.
  • Projects where quick setup and ease of development are priorities.
  • Applications that require a custom architecture and a high degree of flexibility.
  • Teams who prefer to build their technology stack from the ground up and have control over the specific components used.

Analysis of D2

Overall verdict

  • D2 is an excellent modern diagramming tool that lets you create diagrams from plain text, offering a clean syntax, attractive automatic layouts, and strong developer-friendly integration, making it a top choice for text-based diagramming.

Why this product is good

  • Uses a simple, readable declarative syntax that makes diagrams easy to write and version-control
  • Produces polished, professional-looking diagrams with multiple layout engines (Dagre, ELK, TALA)
  • Open source and actively maintained with a growing community and ecosystem
  • Supports advanced features like themes, animations, sketch-style rendering, and interactive tooltips
  • Integrates well with developer workflows, CI/CD pipelines, and documentation-as-code setups
  • Offers both a CLI and a hosted playground for quick experimentation

Recommended for

  • Software engineers and architects documenting system designs
  • Teams practicing diagrams-as-code and version-controlled documentation
  • Technical writers who want reproducible, maintainable diagrams
  • Developers who prefer text-based workflows over drag-and-drop editors
  • Open source projects needing embeddable architecture and flow diagrams

ExpressJS videos

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D2 videos

D2 Review | If John Carpenter's The Thing Was A Soap Opera

More videos:

  • Review - Review: Gait D2 Series
  • Review - Classic Game Room - D2 review for Sega Dreamcast

Category Popularity

0-100% (relative to ExpressJS and D2)
JavaScript Framework
100 100%
0% 0
Developer Tools
98 98%
2% 2
Open Source
0 0%
100% 100
Web Frameworks
98 98%
2% 2

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 D2

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 โ€” or Express for the cool cats โ€” is Node.jsโ€™s minimalist wingman. Itโ€™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

D2 Reviews

We have no reviews of D2 yet.
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Social recommendations and mentions

Based on our record, ExpressJS seems to be a lot more popular than D2. While we know about 493 links to ExpressJS, we've tracked only 4 mentions of D2. 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 (493)

  • Building LoreKeeper: An Immersive 3D Library to Bridge EPUBs and AI
    Backend: Node.js & Express for file handling and metadata extraction. - Source: dev.to / 2 months ago
  • How to Write Authorization Middleware for Express.js Applications
    Casbin provides an external policy engine if your permission model grows complex enough that a centralized JS function becomes hard to maintain. Open Policy Agent serves the same purpose for multi-service architectures. Node.js and Express.js documentation cover the middleware pattern in detail. - Source: dev.to / 2 months ago
  • GraphQL vs REST: 18 Claims Fact-Checked with Primary Sources (2026)
    Many REST frameworks also ship with limited security controls enabled by default. Express.js , a minimal web framework, does not include rate limiting or input validation out of the box and relies on middleware for these concerns. Django REST Framework includes throttling features, but they are not enabled by default. - Source: dev.to / 3 months ago
  • 5 Architecture Patterns Every Web Application Developer Should Understand
    Nearly every server-side web framework uses some version of MVC. Django calls it MTV (Model-Template-View), Rails follows classic MVC, and Express.js gives you the building blocks to implement your own version. - Source: dev.to / 3 months ago
  • Adding Authentication and Remote Support to a Local MCP Server
    For this guide, you will use the authentication proxy approach with Express. This gives you full control over authentication logic and RBAC. It also integrates well with the Descope MCP Express SDK, which is designed to allow you to easily add MCP specification-compliant authorization to your MCP server. The authentication proxy sits between clients and the MCP server, and validates every request before forwarding... - Source: dev.to / 3 months ago
View more

D2 mentions (4)

  • Exploring Goja: A Golang JavaScript Runtime
    I work on the D2 project ([0]) and we switched from other Javascript runners (v8go) to Goja. Using a JS runtime with a dependency on cgo means your Go program loses the (huge) benefit of cross-compiling to different architectures, since at build time it gets linked to the architecture-specific libc. If you're interested in some production code with Goja, this is our code for calling RoughJS [1] from Go in order to... - Source: Hacker News / almost 2 years ago
  • I want to contribute to open source but don't know where to start
    You're welcome in D2! I maintain a Text to diagram language, released a few months ago, 13k+ stars, I'm actively tagging issues that are good first issues, clean well-tested Go, and I'm happy to help you get that first merge in. Feel free to chime in on any issue that looks interesting! https://github.com/terrastruct/d2. Source: about 3 years ago
  • Concrete Diagramming, a Lightweight Alternative to C4
    Right. It's okay to leave written documentation on SaaS (e.g. Notion), because the text is the artifact. If they're shutting down, or I don't like them anymore, I just move the text. But if Ilograph goes down, all I have is useless YAML. Our team went through this thought process when we decided to open source our text-to-diagram language, users need to be able to reproduce their docs even if we shut down... - Source: Hacker News / over 3 years ago
  • Interested in contributing to an open-source project? (11k stars)
    Hello! I run a popular open-source project: https://github.com/terrastruct/d2, it's a programming language for making diagrams from text. Source: over 3 years ago

What are some alternatives?

When comparing ExpressJS and D2, 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

draw.io - Online diagramming application

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

flowchart.fun - An open-source tool for generating flowcharts from text

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