parse_args from reqparse flask_Restful returning error

Question

I'm using flask_restful and using reqparse to get params as an example:

from flask_restful import Resource, reqparse

path_params = reqparse.RequestParser()
path_params.add_argument("city", type=str)
path_params.add_argument("star_min", type=float)
path_params.add_argument("star_max", type=float)
path_params.add_argument("diary_max", type=float)
path_params.add_argument("diary_min", type=float)
path_params.add_argument("limit", type=float)
path_params.add_argument("offset", type=float)

       data = path_params.parse_args()
// returning error here : "message": "Failed to decode JSON object: Expecting value: line 1 column 1 (char 0)"

What can I do to solve this, please?

ljmc · Accepted Answer · 2023-01-11 08:42:47Z

1

What you are seeing is the error when json.load or (json.loads) receives an empty JSON document to decode.

import json

json.loads("")
# raises JSONDecodeError: Expecting value: line 1 column 1 (char 0)

Without more of your code and especially request you sent, we cannot tell you more about your problem.

But, if I run the full example from the Flask-RESTful docs and request an empty JSON doc, I get the same error.

curl http://localhost:5000/todos -H "Content-Type: application/json" -d '' -X POST

{
    "message": "Failed to decode JSON object: Expecting value: line 1 column 1 (char 0)"
}

answered Jan 11, 2023 at 8:42

ljmc

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