How do I `jsonify` a list in Flask? [duplicate]

Question

Currently Flask would raise an error when jsonifying a list.

I know there could be security reasons https://github.com/mitsuhiko/flask/issues/170, but I still would like to have a way to return a JSON list like the following:

[     {'a': 1, 'b': 2},     {'a': 5, 'b': 10} ] 

instead of

{ 'results': [     {'a': 1, 'b': 2},     {'a': 5, 'b': 10} ]} 

on responding to a application/json request. How can I return a JSON list in Flask using Jsonify?

Answer 1

You can't but you can do it anyway like this. I needed this for jQuery-File-Upload

import json # get this object from flask import Response  #example data:      js = [ { "name" : filename, "size" : st.st_size ,          "url" : url_for('show', filename=filename)} ] #then do this     return Response(json.dumps(js),  mimetype='application/json') 

Answer 2

jsonify prevents you from doing this in Flask 0.10 and lower for security reasons.

To do it anyway, just use json.dumps in the Python standard library.

http://docs.python.org/library/json.html#json.dumps