To serve a JSON object instead of a string, you can modify the hello_world function to return a dictionary object instead of a string, and use Flask's jsonify method to convert the dictionary to JSON format. Here's an updated example:

python
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from flask import Flask, jsonify

app = Flask(__name__)

@app.route('/')
def hello_world():
    data = {
        'message': 'Hello, World!',
        'number': 42
    }
    return jsonify(data)

if __name__ == '__main__':
    app.run()
In this updated script, we've created a dictionary called data that contains two key-value pairs: 'message' and 'number'. When the / endpoint is accessed, the hello_world function returns the data dictionary in JSON format using Flask's jsonify method.

When you run this updated script and visit http://localhost:5000 in your web browser, you should see the JSON object displayed on the page, like this:

json
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{
  "message": "Hello, World!",
  "number": 42
}
Note that the jsonify method also sets the appropriate Content-Type header to application/json, so the client receiving the response knows that it's receiving JSON data.
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