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CodePen VS FastAPI

Compare CodePen VS FastAPI and see what are their differences

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CodePen logo CodePen

A front end web development playground.

FastAPI logo FastAPI

FastAPI is an Open Source, modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints.
  • CodePen Landing page
    Landing page //
    2018-09-30
  • FastAPI Landing page
    Landing page //
    2023-05-14

CodePen features and specs

  • Real-time Collaboration
    Developers can collaborate with others in real-time, making it easy to work on projects with teammates or seek help from the community.
  • Immediate Visual Feedback
    CodePen allows you to see the results of your code as you write it, which is highly beneficial for learning and debugging.
  • Integrated Development Environment (IDE)
    CodePen provides a comfortable and feature-rich online IDE environment with syntax highlighting, autocomplete, and more.
  • Community-Driven
    Users can share their work with the CodePen community, receive feedback, and explore a wide range of projects created by others.
  • Extensive Resources
    CodePen offers a wealth of examples and templates for various web development tasks, making it a useful resource for learning and inspiration.
  • Cross-Device Accessibility
    Being an online platform, CodePen can be accessed from any device with an internet connection, making it convenient for developers on the move.

Possible disadvantages of CodePen

  • Limited Offline Functionality
    Since CodePen is primarily an online tool, it requires an internet connection for most of its features to work, limiting its usefulness in offline environments.
  • Performance Constraints
    Complex or resource-intensive projects may not perform as well on CodePen as they would in a full-fledged local development environment.
  • Subscription Costs
    While many features are free, advanced functionalities and additional storage options require a paid subscription, which may not be ideal for all users.
  • Limited Backend Capabilities
    CodePen is primarily designed for front-end development, so it offers limited support for backend technologies, making it less suitable for full-stack or server-side development.
  • Dependency Management
    Managing dependencies and libraries can be cumbersome compared to local development environments which have better tools for this purpose, like npm.
  • Security Concerns
    Sharing projects with the public can expose your code and assets to unauthorized use, posing potential intellectual property and security risks.

FastAPI features and specs

  • High Performance
    Built on Starlette and Pydantic, FastAPI is one of the fastest frameworks for Python, providing high performance due to its asynchronous request handling.
  • Automatic Interactive API Documentation
    FastAPI automatically generates interactive API documentation via Swagger UI and ReDoc, which are very helpful for development and testing.
  • Type Checking and Validation
    With Pydantic models and Python type hints, FastAPI provides automatic data validation and type checking, reducing the chance of runtime errors.
  • Ease of Use
    Its syntax and design make it easy to learn for Python developers, offering a smooth development experience while reducing boilerplate code.
  • Asynchronous Support
    FastAPI supports asynchronous programming, allowing for better performance for I/O-bound operations, making it optimal for handling many simultaneous connections.
  • Extensive Documentation
    It has comprehensive and well-structured documentation, which is very useful for both beginners and advanced users.
  • Community and Ecosystem
    FastAPI has a growing community and ecosystem, with many plugins and integrations available to extend its functionality.

Possible disadvantages of FastAPI

  • Learning Curve for Asynchronous Programming
    Although FastAPI itself is easy to learn, grasping the concepts of asynchronous programming in Python can be challenging for beginners.
  • Complex Dependencies
    Using Pydantic for advanced validation can make the request models complex, requiring a deeper understanding of Pydantic and its functionalities.
  • Early Stage Libraries
    Some third-party libraries and extensions specifically tailored for FastAPI might still be in early stages of development and lack long-term stability.
  • Limited Real-World Examples
    Although the documentation is extensive, there might be limited real-world examples and case studies readily available compared to more mature frameworks.
  • Deployment Complexity
    Deploying FastAPI applications might be more complex in comparison to traditional synchronous frameworks, mainly due to the need for asynchronous server setups.

CodePen videos

+ Add

What Is Codepen?

More videos:

  • Review - Learn to use CodePen from a co-founder of CodePen
  • Review - Using CodePen For Inspiration & Learning

FastAPI videos

+ Add

FastAPI from the ground up

More videos:

  • Tutorial - 30 Days of Python - Day 14 - Web App with Flask, FastAPI, ngrok, and Invictify - Python TUTORIAL
  • Review - [PT] Python - API com FastAPI - Chat | twitch.tv/codeshow

Category Popularity

0-100% (relative to CodePen and FastAPI)

CodePen

FastAPI

Text Editors
100 100%
Text Editors
0% 0
Developer Tools
0 0%
Developer Tools
100% 100
Programming
100 100%
Programming
0% 0
Web Frameworks
0 0%
Web Frameworks
100% 100

User comments

Share your experience with using CodePen and FastAPI. For example, how are they different and which one is better?
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Reviews

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

CodePen Reviews

Best Forums for Developers to Join in 2025
Codepen is a social network for developers to show off their work, ask and answer questions, and exchange ideas. It's like a Reddit for coding and design, with a large community of talented web developers.
Source: www.notchup.com
Top 10 Developer Communities You Should Explore
Codepen is a social development environment that allows developers to showcase their work and experiment with HTML, CSS, and JavaScript in a collaborative space. Codepen’s focus on visual and interactive development makes it an excellent community for front-end developers and designers.
Source: www.qodo.ai
8 Best Replit Alternatives & Competitors in 2022 (Free & Paid) - Software Discover
Codepen is a social development environment for front-end designers and developers. Build and deploy a website, show off your work, build test cases to learn.
Source: www.softwarediscover.com
Best Online Code Editors For Web Developers
Probably the most popular online code editor. CodePen is fast, easy to use, and allows a web developer to write and share HTML/CSS/JS code online.
Source: techarge.in
Top 25 websites for coding challenge and competition [Updated for 2021]
CodePen is a cool online IDE that allows you to write code in your browser and see the result just as you build it. CodePen challenges is a place for leveling up your skills by building things. Each week, new challenges appear for you to tackle, and the best “Pens” get picked.
Source: towardsdatascience.com

FastAPI Reviews

The 20 Best Laravel Alternatives for Web Development
FastAPI, as the name hints, is a swift mover. Built on Starlette, it’s all about speed and performance with Python. Crafting API masterpieces at the speed of light, now that’s something.
Source: tms-outsource.com
25 Python Frameworks to Master
Since its release in 2018, it has rapidly gained popularity due to its great performance and simplicity. In fact, according to PyPi Stats, FastAPI has over 9 million monthly downloads, surpassing even full-stack frameworks like Django.
Source: kinsta.com
3 Web Frameworks to Use With Python
myapp/ is the main directory of your FastAPI application. It includes all the other files and directories needed for the application.static/ is a directory used to store static assets such as CSS, JavaScript, and image files. These assets are served directly by the web server and are typically used to add visual styling and interactivity to the application.css/, img/, js/...
Source: www.stratascratch.com
Best Alternatives to FastAPI App Free for Windows (2021)
FastAPI Alternative – So many alternatives app to FastAPI that you must to know out there. And, looking for an ideal software was not easy matter. Lucky you, at this page you can find the best replacement app for FastAPI. So what you are waiting for, get the latest FastAPI alternative app for Windows 10 from this page.
Source: alternativetoapp.com
Top 5 Back-End Frameworks to Consider for Web Development in 2021
FastAPI is a modern, fast (high-performance), web framework for building APIs with Python 3.6+ based on standard Python type hints. It is fast when compared to other major Python frameworks like Flask and Django. FastAPI gives great flexibility to fulfill businesses’ API needs in today’s evolving world.
Source: www.fissionlabs.com

Social recommendations and mentions

Based on our record, CodePen should be more popular than FastAPI. It has been mentiond 503 times since March 2021. 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.

CodePen mentions (503)

View more

FastAPI mentions (288)

  • How to Set Up CI/CD for a Python Backend Application on Fly.io Using GitHub Actions
    The backend of this accountability AI application is built using FastAPI, a high-performance framework for Python. The app allows users to communicate with the AI, which helps them stay accountable by generating responses based on their input. Below is a breakdown of the key components used in the code:. - Source: dev.to / 13 days ago
  • 🚀 Building Recallr: How I Turned PDFs into Anki Flashcards with AI
    Until I realized Anki has their own API Interface, which made me realize that I can automate this task, efficiently, while also getting hand on experience using FastAPI and LLMs (but am I going to change the stack later?.. Lets see). - Source: dev.to / 10 days ago
  • Building Weather & History Story Cards with Python and FastAPI
    By the end of this tutorial, you’ll see how I used FastAPI and Jinja2 to turn raw JSON into a dynamic timeline of weather and history that feels informative and fun. - Source: dev.to / 25 days ago
  • Build Code-RAGent, an agent for your codebase
    The only thing left to do then was to build something that could showcase the power of code ingestion within a vector database, and it immediately clicked in my mind: "Why don't I ingest my entire codebase of solved Go exercises from Exercism?" That's how I created Code-RAGent, your friendly coding assistant based on your personal codebases and grounded in web search. It is built on top of GPT-4.1, powered by... - Source: dev.to / 26 days ago
  • Understanding the Relation Between FastAPI and Uvicorn
    FastAPI and Uvicorn are two essential building blocks when developing high-performance Python APIs. - Source: dev.to / 27 days ago
View more

What are some alternatives?

When comparing CodePen and FastAPI, you can also consider the following products

JSFiddle - Test your JavaScript, CSS, HTML or CoffeeScript online with JSFiddle code editor.

Django - The Web framework for perfectionists with deadlines

CodeSandbox - Online playground for React

Flask - a microframework for Python based on Werkzeug, Jinja 2 and good intentions.

GitHub - Originally founded as a project to simplify sharing code, GitHub has grown into an application used by over a million people to store over two million code repositories, making GitHub the largest code host in the world.

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

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