FastAPI vs Flask: A Head-to-Head Comparison of Web Frameworks
FastAPI and Flask are two of the most popular frameworks for Python. They have been around for years, and the projects they have been used for have become some of the most well-known applications in existence.
However, when you're building a website, there are many factors that go into making the right decision about which technology to use. You may want to build a simple website for your small business and get it up quickly, or you might be working on something more complex — such as an API endpoint that serves data from your machine learning model. In this article we'll compare Flask vs FastAPI and talk through some of the differences between the two frameworks.
What is a web development framework?
A web development framework is a software framework that is used to develop web applications. It's a collection of libraries, modules, functions and classes that are used to develop web applications. A good example of a widely-used web development framework is Django which is written in Python and developed by Django Software Foundation (DSF).
Web frameworks can be used to develop any kind of application: from small single-page apps to large full-stack ones like Google App Engine or Heroku Cloud Platform where you can deploy your app on the cloud using a SaaS provider like Heroku or AWS Lambda function with NodeJS as HTTP Server.
What is Flask?
Flask is a microframework for Python, written in Python. It's known to be lightweight and extensible, which means that it can be used to build simple or complex web applications quickly. Flask can also be used as part of a larger application development stack with other frameworks such as Django or Pyramid.
Flask is similar in function to Web2py, but it has been designed specifically for writing single-page applications (SPA). This means that rather than building up your database queries from scratch each time you need them, you can just let the database handle this job for you using its built-in ORM system.
What is FastAPI?
FastAPI is a lightweight Python 3.7+ web framework for building high-performance, scalable, and distributed web APIs.
FastAPI is built on top of the Tornado web server and is compatible with the WSGI specification. It includes an API manager that works with any modern HTTP client like cURL or Requests to simplify API management. The API manager also provides support for multiple languages and frameworks such as Django, Flask, and Pyramid via adapters.
Is FastAPI built on Flask?
FastAPI is built on Flask, a microframework. Flask is a Python library that provides an easy way to create web applications using Python and HTML/CSS.
What is Web Server Gateway Interface WSGI?
Web Server Gateway Interface (WSGI) is a Python standard for web servers and web applications to interface with each other. It was first introduced in 1999, and it's still used today by many of the most popular websites on the internet.
If you're new to programming, this might seem like an odd place to start your journey into Python — but if you've ever worked with Ruby or PHP before, then you'll immediately recognize how similar it is: both languages use the same basic structure (the "HTTP" request) while also using different libraries (the "HTML" response).
What is Asynchronous Server Gateway Interface ASGI?
Asynchronous Server Gateway Interface (ASGI) is a specification for building asynchronous, event-driven web applications. It comes with a framework-agnostic API, which means you can use any framework to build your application using ASGI.
Asynchronous Server Gateway Interface (ASGI) was created by the same people who created FastAPI. The two specifications are complementary in many ways:
- They both allow you to write code that's asynchronous and event-driven.
- They both have their own libraries and tools that make it easy for web developers to use them, and more recently there has been some cross-over between them at conferences such as PyCon2016 where both were demonstrated together on stage during one talk!
FastAPI is a full-stack framework that provides you with everything you need to build your API.
Flask is a microframework, which means that it doesn't provide you with all the features that FastAPI does. However, Flask can still be useful if you want to prototype an idea quickly or build a simple web application in Python.
The main difference between Flask and FastApi is how they're used: while Flask is for prototyping new ideas or applications, FastApi is for building APIs (application programming interfaces), It also provides you with an option to build your backend server quickly, easily and with no coding experience required!
FastAPI vs Flask for small-scale websites and web applications.
FastAPI is a modern web development framework. It's lightweight, easy to learn, and can be used to build small-scale websites and web applications.
FastAPI comes with an ORM (Object Relational Mapping) layer which handles data objects in the application so that you can access them easily through your code. The ORM layer also helps keep track of all your database tables and fields so you don't have to worry about updating them manually when new information is added or changed by one of our users on their website or app pages.
FastAPI vs Flask for Machine Learning Models.
FastAPI is a Python framework for building modern web APIs. It's built on top of Flask, so you can use the same code base to build both fast and scalable RESTful APIs as well as machine learning models.
FastAPI has a lot of features that make it a great choice for machine learning models:
- Support for many popular libraries including Keras, TensorFlow, and NiFi (with our proprietary cosmo library).
- Extensible plugins allow you to add new functionality without having to rewrite any core code.
- The flexible architecture allows you to easily customize your API or even build your own modules entirely from scratch Theory.
FastAPI and Flask are used in the following applications:
- IFTTT - a cloud platform that makes it easy to connect your favorite apps, devices, and services.
- Tasker - an Android app that lets you automate tasks on your phone.
- VSCO - a photo editing app for iOS and Android that provides filters, frames, and other editing tools to make photos look their best.
- Twitter - a social networking website where users can post status updates and other content to Twitter-owned profiles or to public timelines.
- Telegram - a messaging application with end-to-end encryption for secure communications between two parties (messages sent via Telegram are automatically encrypted using OpenPGP protocol).
Is Flask the same as FastAPI?
Yes and no. Flask is a microframework for Python, which means that it’s small and easy to install. FastAPI on the other hand is a full-fledged framework for building APIs in Python. It can be used to create all kinds of APIs from e-commerce to social media sites and more.
So while Flask is similar to FastAPI in many ways, they are both different toolsets with different purposes!
How are Flask and FastAPI similar?
Flask and FastAPI are both open-source, written in Python, built on top of the Werkzeug web framework, and built using the WSGI standard. This allows them to be run as separate applications that communicate with each other via socket connections. They also share a lot of similarities in terms of templates, database drivers, and ORM libraries (SQLAlchemy).
Why is the wrong data type in an API endpoint a big deal?
The wrong data type in an API endpoint is a common error, but it’s also one that can have serious consequences for your business. Here are some of them:
- Wrong data being returned from an API endpoint will lead to wrong data being stored in the database. This means that if you make changes to the database later on (such as adding new fields), they won’t be reflected in any places where they should be reflected (like reports or emails). It might also mean that there are discrepancies between what's supposed to happen and what actually happens—for example, if someone saves their payment details within Magento but then sends another payment later with those same details, only one of those transactions will show up as successful on their account history page!
- Sending incorrect information via email may result in lost customers due to over-delivery or under-delivery—and not just because they didn't receive the information at all; even worse would be when people don't know how much time has passed since receiving such messages until we're already too late…
What are the pros of using FastAPI for a project?
FastAPI is an API platform with a focus on simplicity, reliability, and security. It is designed for developers who need to build APIs quickly and easily. FastAPI does not require any programming knowledge and can be used by anyone from non-programmers to software developers.
FastAPI offers a wide range of features, including RESTful HTTP requests, XML/JSON responses, authentication using OAuth 2.0 or OpenID Connect protocols, SSL/TLS encryption, and more.
The API is managed through an easy-to-use web interface that allows you to administer your account settings and customize the API's behavior. You can also use FastAPI's built-in monitoring tools to monitor your API usage and get alerts when it reaches important thresholds such as request count limits or response timestamps expiration dates.
Quicker development time with FastAPI than with Flask
FastAPI is a framework that helps you to build APIs, and it's based on Flask. FastAPI is an extension of the popular web application framework, which means it provides all of the features that you'd expect from Flask but with additional functionality built-in. This can be particularly useful if you want to use a toolkit-based approach instead of building everything from scratch or using one of the many boilerplate generators available online like Flask-Bootstrap.
FastAPI also borrows some ideas from other libraries like Pyramid or Django's admin site generator Django-admin, so if you're already familiar with these frameworks then learning how they work together should take less time than learning new technology.
What are the cons of using FastAPI for a project?
The first is that it is expensive. The price of a FastAPI subscription varies by country and by how many API calls you to make per month, but even at $99/month, it's still not cheap. You also have to pay for each call individually, not just for the whole month.
The second con is that it can be difficult to scale your project if you've used FastAPI in the past. If you're looking at scaling your project from something small like a side project to something bigger like an app or website, you might have trouble if all your code is written in PHP and uses MySQL or Postgres. It might be easier for now if you use FastAPI with Python or Ruby (which both have excellent data modeling libraries), but if you want long-term scalability, this may not be the best choice for your project.
What are the pros of using Flask for a project?
Flask is a microframework. It’s easy to get started with and comes with a wide range of third-party libraries, making it the ideal choice for projects requiring advanced functionality.
Simple. Flask is very simple to learn and use. It has a very small codebase, which means it's easy to understand what's going on under the hood. You don't need to worry about finding modules or libraries that you can use in your app (and there aren't many).
Clean. Flask makes sure that you don't have any global variables in your app so that each request gets its own namespace. This helps keep track of what belongs to what object, which makes debugging easier as well as making it easier to see what's going on under the hood when you're writing your app's code.
Unopinionated. Flask doesn't prescribe any particular way of doing things; instead, it gives you a set of tools that you can use however you want. This means that if you want something different from what someone else wrote (for example, if you want to do something different than they did), there's nothing stopping you from doing so!
What are the cons of using Flask for a project?
Flask is a little more complex than FastAPI. This can be an issue for some people as they may not have the time to learn how to use Flask, or their skills may not be strong enough for them to be able to do so. Also, if you have never used Python before and have no idea where to start learning it then this can be an issue too since there are many different parts of Python that need to be understood in order for them all to work together properly
Less well-documented than FastAPI (although this has been changing recently). There aren't many tutorials or guides out there on how best to use each feature of Flask; however, we hope these will help change that soon! Whilst it's true that with every new version comes new features like private methods or decorators which give us even more power over our applications - but sometimes we just want something simple so we don't need those extra bells and whistles.
Performance: Flask is fast, but not very fast. It's a good choice if you're building a small site that doesn't need to be fast. However, if your project needs to be fast and you want to take advantage of the speed in other languages, Flask isn't going to cut it.
In conclusion, if you're looking for a lightweight Python web framework that's similar to Django in terms of flexibility, Flask and FastAPI are certainly two options worth considering. If you're building a simple web application that relies on JSON APIs or is particularly data-heavy, we recommend FastAPI over Flask as it will save you time and frustration down the line. On the other hand, if you're building a consumer-facing application that involves generating HTML pages dynamically, we suggest going with Flask over FastAPI because the learning curve is more manageable.