CODEWITHSUNDEEP
pythonflask
user1592380
user1592380

Reputation: 36337

Flask.json_encode, TypeError: __init__() got an unexpected keyword argument

I'm getting started with flask. I'm trying to return some json from a flask app which I want to generate from a dictionary:

My code looks like:

resp = views.calculate(d)
print type(resp)
print resp
return Flask.json_encoder(**resp)

The output:

<type 'dict'>
{'target1': 'DOES NOT EXIST', 'stage': 0, 'token': u'fsdfsdf', 'target2': 'DOES NOT EXIST', 'text': ''}

and finally I get The error above. How can I fix this?

Upvotes: 1

Views: 4728

Answers (1)

Martijn Pieters
Martijn Pieters

Reputation: 1124548

Flask.json_encoder is the class used to encode JSON with. It does not accept keyword arguments, nor would calling it produce JSON directly.

To produce a response with JSON encoded data, use flask.jsonify() instead:

from flask import jsonify

return jsonify(**resp)

If all you need is the JSON string, use flask.json.dumps() here, passing in the dictionary (and not keyword arguments):

from flask import json

return json.dumps(resp)

In both cases the class referenced by Flask.json_encoder (via the app instance) would be used to produce the JSON encoding.

Upvotes: 2

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