Flask POST not retrieved by request.json

Question

I would like to create a REST-Api using Flask. As a "frame" I found this Tutorial which seemed to be really good about creating a REST-API using Flask and it also seems to be easy...

I have this function:

@app.route('/api/users', methods=['POST'])
def new_user():
    username = request.json.get('username')
    password = request.json.get('password')

But when I try to post data using SOAPUI or HTTPRequester (in Firefox) I always get a server error 500

My application/json data looks like this:

{
 'username' : 'John',
 'password' : '1234'
}

And I checked that in both tols it is sent as application/json.

So I inserted the following before the request.json:

if not request.json:
    abort(400)

And now it aborts with code 400 - so it seems not to be a json object, right?

Then I inserted the following lines:

test = request
print test.data

Then I retrieve this in the console which looks tome like JSON:

{
    'username' : 'John',
    'password' : '1234'

    }

I know I could transform that into a dictionay using this:

dict = ast.literal_eval(test.data)

But I would like to use the standard functonality from flask.

Thank you in advance...

Answer 1

First of all check your HTML headers sent by your client (JS or anything else). Content-Type should be application/json. And use request.get_json().

UPD: also you can try to use request.get_json(force=True, silent=True). And flask code for this method is very simple, you can debug it putting breakpoints or writing to log in it for better understanding what happens.