app.py

from flask import Flask, jsonify, request

app = Flask(__name__)

@app.route('/')
def hello():
    name = request.args.get('name', '')
    if name:
        message = f'Hello, {name}!'
    else:
        message = 'Hello!'
    return jsonify(message=message)

if __name__ == '__main__':
    app.run()