Day 78 of #100DaysOfCode — Introduction to Flask: Setup and First App

📰 Dev.to · M Saad Ahmad

Learn to set up and build your first Flask app, a lightweight Python web framework, and understand its basics

beginner Published 21 Apr 2026

Action Steps

Install Flask using pip with the command 'pip install flask'
Create a new Flask project by running 'flask new'
Configure the Flask app by setting the debug mode and running it with 'flask run'
Build a simple route using the '@app.route()' decorator
Test the Flask app by visiting the specified URL in a web browser

Who Needs to Know This

Backend developers and software engineers can benefit from learning Flask for building web applications and APIs, and can work together to integrate it with other technologies

Key Insight

💡 Flask is a lightweight and flexible Python web framework that allows for rapid development of web applications and APIs