Express vs Flask

Express vs Flask: Which is Better for Your Site?

There are many web development frameworks out there, but two of the most popular ones are Express and Flask. So, which one should you use?

In this article, I’ll compare Express and Flask and you will get a clear view that which one is better for your site in the case of Express vs Flask. So let’s start with what Express and Flask are.

What’s Express?

Express is built with Node.js. It was created to be quick, straightforward, and simple to use. Many features are supported by Express, including routing, sessions, and the Templating Engine (more about that later).

Because Express is developed using JavaScript, it is sometimes referred to as modern technology.

Key features: Express can easily create RESTful APIs, and it also offers support for a wide range of databases, including MongoDB, MySQL, and PostgreSQL. Furthermore, Express also comes with a template engine that helps you to create HTML pages easily. at

What’s Flask?

Flask is a free and open-source web development framework written in Python. It is a micro-framework that provides only the essential components of a web application.
People often refer to Flask as a “micro-framework” because it doesn’t require particular tools or libraries.

Features of Flask: Flask is very lightweight, and easy to set up, and; it has no database abstraction layer, form validation, or any other components where preexisting third-party libraries provide common functions.

Comparison Table: Express vs Flask

Express is written in JavaScriptFlask is written in Python
Faster than Flask thanks to the Google V8 engineSlower than Express because of less request handling capacity
Easy to learn and useIt may be hard to learn for people who don’t know Python
Bigger community supportBig community support but not as Express
Suitable for small websites and for making APIsNot suitable for small projects but bigger ones
Express vs Flask

What are the Pros and Cons of Express and Flask?

Both Express and Flask are very popular and powerful technologies for web development. But still, both of them have their pros and cons. Following are some of the pros and cons of Express and Flask.

Pros of Express and Flask

Pros of ExpressPros of Flask
1. Faster than Flask due to the V8 engineMore lightweight than Express
2. Has great community supportDifferent Python libraries can be used easily
3. Makes web applications faster and in less timeMore powerful than Express
Pros of Express and Flask

Cons of Express and Flask

Cons of ExpressCons of Flask
1. Callback patterns can be difficult to understandNot beginner-friendly documentation
2. Does not support some features that other frameworks like Django doDifficult to learn
3. Can be difficult to scale and maintainLacks some of the built-in features
Cons of Express and Flask

What is the use of Express and Flask?

You can use both Express and Flask to create a wonderful project. You can use both to create a simple website to a CMS (Content Management System).

Both can be used to develop a blog website or even a social media website.

Infographic Express vs Flask
Infographic: Express vs Flask

What are the Main Differences Between Express and Flask?

There are quite some differences between Express and Flask that make them differ from each other. Following are some of the main differences between Express and Flask that will help you decide better which one is better for you.

Code Run Speed

The latency of code execution is a critical aspect of a website. If the code run latency is minimal, your website will be faster, and Google prefers faster websites.

Because Express is written in JavaScript and Django in Python, and because JavaScript is much quicker than Python, Express is also faster than Flask thanks to the Chrome V8 Engine.

Ease of Use

Ease of usability is a very important aspect when choosing a web development framework and especially in the case of Express vs Flask.

Flask is quite easy to use than Express and was written in JavaScript; secondly, you can easily use other Python libraries in Flask too which provides more features than Express and Node.js.

Written in Different Programming Languages

The main difference between Express and Flask is the programming languages in which they are written. Express is written in JavaScript; on the other hand, Flask is made using Python.

Limitations of Express

Despite being a rather robust framework, Express has certain limitations. The following are some Express limitations that can make it less effective than Flask.

Monolithic Framework

A monolithic framework, Express.js. This implies that it comes with a routing system, template engine, and database adapter—everything required to create a web application or API. As a result, Express.js projects may grow to be complex and difficult to change.

Not Very Portable

The lack of portability of Express.js programs is another drawback. They frequently make use of features that are not available on other platforms since they are built to run on a particular platform (Node.js) and operating system (Linux).

Limitations of Flask

Flask is a framework created with Python that’s why it’s very powerful but yet it has some limitations. Some of these limitations will not even affect your work if you’re using it for your website.

Not Suited For Small Projects

Flask is not suited for small projects; if you’re creating a personal site on which very few visitors will come then don’t use Flask. Because it’ll take more time to make and makes it even harder to make your website.

More Potential for Security Risks

Even though Python and Flask are very secure, but still Flask is vulnerable to security threats. It doesn’t come with a built-in security system like Django.

Read more about: Differences Between Flask and Django

Stats of Express and Flask

Express and Flask are well-known and capable web development frameworks. The following are some of Express and Flask’s interesting statistics:

Stats of Express:

Stats of Flask:

Image showing stats of Express and Flask

Which one to Choose for Your Site?

There’s no definite answer to this question, but it depends on your needs which one you should choose. For instance, if you need a fast website with decent functionalities then you should go with Express.

But if speed isn’t a concern for you and you only need the features of Python, and a lightweight framework, then Flask will be a better choice.


Express is a Node.js package for web development written in JavaScript. While Flask is a web development framework written in Python. In this article, I have discussed some of the differences between Express and Flask that will help you to decide which one is better for your site.

In the end, there’s no clear winner when it comes to Express vs Flask. Both have their pros and cons. It depends on your specific needs and what you are looking for in a web development framework.

What do you think which framework is better in the case of Express vs Flask? Let us know in the comments.

Being a web developer, writer, and blogger for five years, Jade has a keen interest in writing about programming, coding, and web development.
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