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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 to get a result that looks more like what json.dumps returns. What am I doing wrong?

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.

For a complete reference, see the jsonify() function.

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. The Response() class is referenced by response class().

Answered by Michael Ekoka

Solution #4

The choice of one or another depends on what you intend to do. From what I do understand:

Answered by chaiyachaiya

Solution #5





will return ‘fld’:’hello’ and




Answered by Govind Kelkar

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