I had this error and I used the json.dump the wrong way around:

Correct way:

with open("Jello.json", "w") as json_file:
    json.dump(object_to_be_saved, json_file)

Wrong way:

I did it the other way around json.dump(json_file, object_to_be_saved)... Thanks Python.

Answer from Ben Butterworth on Stack Overflow
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reddit.com › r/learnpython › tough time parsing json files, i receive an iowrapper object rather than string.
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December 28, 2017 - The biggest problem is that you aren't actually writing the JSON correctly: you need to use json.dump() or json.dumps(). I'm going to show you two different ways you might serialize/deserialize JSON data, you should be able to adapt one or the ...
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November 19, 2023 - The error message 'TypeError: object of type 'TextIOWrapper' is not JSON serializable' arises when a program written in Python tries to convert a data structure that's not suitable for JSON formatting into the JSON format using the json library.
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HatchJS
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Imooc
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typeerror object of type textiowrapper is not json serializable
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GitHub
github.com › keras-team › keras › issues › 12077
TypeError: cannot serialize '_io.TextIOWrapper' object after adding layer · Issue #12077 · keras-team/keras
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