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According to the get_json docs:

[..] function will return None if the mimetype is not application/json but this can be overridden by the force parameter.

So, either specify the mimetype of the incoming request to be application/json:

curl localhost:5000/post -d '{"foo": "bar"}' -H 'Content-Type: application/json' 

or force JSON decoding with force=True:

data = request.get_json(force=True) 

If running this on Windows (in cmd), you'll also need to change the quoting of your JSON data, from single quotes to double quotes:

curl localhost:5000/post -d "{\"foo\": \"bar\"}" -H 'Content-Type: application/json' 

According to the get_json docs:

[..] function will return None if the mimetype is not application/json but this can be overridden by the force parameter.

So, either specify the mimetype of the incoming request to be application/json:

curl localhost:5000/post -d '{"foo": "bar"}' -H 'Content-Type: application/json' 

or force JSON decoding with force=True:

data = request.get_json(force=True) 

If running this on Windows (cmd.exe, not PowerShell), you'll also need to change the quoting of your JSON data, from single quotes to double quotes:

curl localhost:5000/post -d "{\"foo\": \"bar\"}" -H 'Content-Type: application/json' 

According to the get_json docs:

[..] function will return None if the mimetype is not application/json but this can be overridden by the force parameter.

So, either specify the mimetype of the incoming request to be application/json:

curl localhost:5000/post -d "{\"foo\": \"bar\"}" -H 'Content-Type: application/json' 

or force JSON decoding with force=True:

data = request.get_json(force=True) 

According to the get_json docs:

[..] function will return None if the mimetype is not application/json but this can be overridden by the force parameter.

So, either specify the mimetype of the incoming request to be application/json:

curl localhost:5000/post -d '{"foo": "bar"}' -H 'Content-Type: application/json' 

or force JSON decoding with force=True:

data = request.get_json(force=True) 

If running this on Windows (in cmd), you'll also need to change the quoting of your JSON data, from single quotes to double quotes:

curl localhost:5000/post -d "{\"foo\": \"bar\"}" -H 'Content-Type: application/json' 

According to the get_json docs:

[..] function will return None if the mimetype is not application/json but this can be overridden by the force parameter.

So, either specify the mimetype of the incoming request to be application/json:

curl localhost:5000/post -d '{"foo": "bar"}' -H 'Content-Type: application/json' 

or force JSON decoding with force=True:

data = request.get_json(force=True) 

According to the get_json docs:

[..] function will return None if the mimetype is not application/json but this can be overridden by the force parameter.

So, either specify the mimetype of the incoming request to be application/json:

curl localhost:5000/post -d "{\"foo\": \"bar\"}" -H 'Content-Type: application/json' 

or force JSON decoding with force=True:

data = request.get_json(force=True)