Flask — Minimal Web Framework

Install: pip install flask

from flask import Flask, jsonify, request

app = Flask(__name__)

# Simple route
@app.route("/")
def home():
    return "Hello World"

# Return JSON
@app.route("/users")
def get_users():
    users = [{"id": 1, "name": "Alice"}]
    return jsonify(users)

# URL parameter
@app.route("/users/<int:user_id>")
def get_user(user_id):
    return jsonify({"id": user_id})

# POST endpoint
@app.route("/users", methods=["POST"])
def create_user():
    data = request.get_json()
    name = data.get("name")
    return jsonify({"created": name}), 201

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

Run with: python app.py. Visit http://localhost:5000.

For production APIs: Consider FastAPI (automatic docs, async support) or Django REST Framework (full-featured).

Reference:

Wikipedia: Flask

https://en.wikipedia.org/wiki/Flask_(web_framework)