How Do I Return JSON Responses from Flask Views?

Returning JSON Responses from Flask Views

In Flask, you can easily return JSON responses from views to send data back to the client. This is accomplished by returning a Python list or dict from the view, which Flask will automatically convert to JSON.

For example, if you have a view that analyzes a CSV file and produces a summary:

@app.route("/summary")
def summary():
    d = make_summary()
    # send it back as json

To return this summary as a JSON response, simply return the dictionary directly from the view. Flask will automatically serialize it to JSON and send it to the client.

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

If you are using an older version of Flask or need to return a different JSON-serializable object, you can import and use Flask's jsonify function:

from flask import jsonify

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

This will also convert the object to JSON before sending it as a response.

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