A Flask decorator that takes a response with JSON content and converts it to a well-formatted JSONP response.

jsonp.py

def jsonp():
    
    def decorator(f):
        
        @wraps(f)
        def decorated_function(*args, **kwargs):
            if not 'callback' in request.args:
                abort(404)
            response = f(*args, **kwargs)
            if isinstance(response,str):
                response = make_response(response)
            response.data = "%s(%s)" % (request.args['callback'],response.data)
            response.mimetype = 'application/javascript'
            return response
        
        return decorated_function
    
    return decorator