JSONP in Flask

jsonp-in-flask.py

import json
from functools import wraps
from flask import redirect, request, current_app

def support_jsonp(f):
    """Wraps JSONified output for JSONP"""
    @wraps(f)
    def decorated_function(*args, **kwargs):
        callback = request.args.get('callback', False)
        if callback:
            content = str(callback) + '(' + str(f(*args,**kwargs).data) + ')'
            return current_app.response_class(content, mimetype='application/javascript')
        else:
            return f(*args, **kwargs)
    return decorated_function

# then in your view
@default.route('/test', methods=['GET'])
@support_jsonp
def test():
    return jsonify({"foo":"bar"})

cool!

Response.data should not be used for recent versions of Werkzeug (and thus Flask). So the following uses get_data() and set_data(). Furthermore, using get_data(as_text=True) makes it work with Python3 as well as Python2. I also just modify the original request instead of creating a new one. Is there something wrong with doing that?

def jsonp(func):
    """Wraps JSONified output for JSONP requests."""
    @wraps(func)
    def decorated_function(*args, **kwargs):
        callback = request.args.get('callback', False)
        if callback:
            resp = func(*args, **kwargs)
            resp.set_data('{}({})'.format(
                str(callback),
                resp.get_data(as_text=True)
            ))
            resp.mimetype = 'application/javascript'
            return resp
        else:
            return func(*args, **kwargs)
    return decorated_function

@aisipos
Based on your gist, I edit some place to make json response can contain status code, please see my fork https://gist.github.com/JiaKunUp/a9df722bad15c61ea555fa860997edc9

good job, helped me