How to Return JSON Responses from Flask Views?

Serving JSON Responses in Flask Views

In the context of Flask, you're seeking a method to craft a JSON response from your view that will display the results of a data analysis function. To achieve this, Flask provides a straightforward approach.

Direct Response with Python Objects

In contemporary Flask versions, you can directly return a Python dictionary or list from your view, and Flask will automatically convert it to JSON for the response.

@app.route("/summary")
def summary():
    d = make_summary()
    return d

JSONify for Older Versions and Custom Objects

For older Flask versions or when returning a custom object that's not natively JSON-serializable, you can utilize Flask's jsonify function.

from flask import jsonify

@app.route("/summary")
def summary():
    d = make_summary()
    return jsonify(d)

This approach ensures seamless conversion of your data to a JSON format, enabling you to present your analyzed information effectively in your Flask API.

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