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json.dumps vs flask.jsonify


I’m not sure I understand the flask’s function. jsonify is a technique that converts a string into a j I try to convert this to a JSON string:

data = {"id": str(, "title": album.title}

However, what I receive with json.dumps is not the same as what I get with flask. jsonify.

json.dumps(data): [{"id": "4ea856fd6506ae0db42702dd", "title": "Business"}]
flask.jsonify(data): {"id":…, "title":…}

Obviously, I need a result that resembles the output of json.dumps. What am I doing incorrectly?

Asked by Sergei Basharov

Solution #1

The flask jsonify() function returns a flask. For use with json responses, utilize a Response() object that already has the necessary content-type header ‘application/json’. The json.dumps() function, on the other hand, will just return an encoded text, requiring the MIME type header to be manually added.

See more about the jsonify() function here for full reference.

Edit: I’ve also found that jsonify() can use kwargs or dictionaries, whereas json.dumps() can also handle lists and other data types.

Answered by Kenneth Wilke

Solution #2

You can do:



flask.jsonify(id=str(, title=album.title)

Answered by mikerobi

Solution #3

This is flask.jsonify()

def jsonify(*args, **kwargs):
    if __debug__:
    return current_app.response_class(json.dumps(dict(*args, **kwargs),
        indent=None if request.is_xhr else 2), mimetype='application/json')

In that sequence, the json module used is either simplejson or json. current app is a reference to your application’s Flask() object. response_class() is a reference to the Response() class.

Answered by Michael Ekoka

Solution #4

The decision between the two is based on your objectives. From what I’ve gathered:

Answered by chaiyachaiya

Solution #5





will return ‘fld’:’hello’ and




Answered by Govind Kelkar

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