AJAX Post Request to Python Flask
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From the flask documentation,
If the mimetype is application/json this will contain the parsed JSON data. Otherwise this will be None .
The key there is that .json is the parsed JSON data, not the original string. If you want to write it to a file, you'll need to convert it back to a string it first, perhaps by using json.dumps() :
with open("C:test.txt", 'w') as f:
f.write(json.dumps(regions))