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Flask Web App

6 min read

Flask is a lightweight web framework. Define routes with @app.route('/path'). Return JSON with jsonify(). Read POST data with request.get_json() and query parameters with request.args.get('key').

Flask Basics

pip install flask

from flask import Flask, jsonify, request

app = Flask(__name__)

@app.route("/")
def home():
    return "Hello, Flask!"

@app.route("/api/users", methods=["GET"])
def users():
    return jsonify([{"id": 1, "name": "Alice"}])

if __name__ == "__main__":
    app.run(debug=True)

← HTTP Requests Next: SQLite with Python →

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Flask Web App

Flask Basics