Deserialize a JSON string into a Python object

This post will discuss how to deserialize a JSON string into a Python object.

1. Using `json` Library

The idea is to use the loads() function from the json library to parse a JSON string into a Python object. It raises JSONDecodeError if the JSON string is not valid.

import json

if __name__ == '__main__':

json_str = '{"name": "John", "age": 18}'

obj = json.loads(json_str)

print((obj['name'], obj['age'])) # ('John', 18)

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2. Using `simplejson` Library

Another simple option is to use the simplejson library, which offers significant performance advantages over the json library. You can use its loads() function to deserialize a string to a Python object. This function also raises the JSONDecodeError when the JSON string is not valid.

import simplejson

if __name__ == '__main__':

json_str = '{"name": "John", "age": 18}'

obj = simplejson.loads(json_str)

print((obj['name'], obj['age'])) # ('John', 18)

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3. Using `ast` module

Another plausible way is to use the ast.literal_eval for safely evaluating a string to a Python object. Here’s a working example:

import ast

if __name__ == '__main__':

json_str = '{"name": "John", "age": 18}'

obj = ast.literal_eval(json_str)

print((obj['name'], obj['age'])) # ('John', 18)

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4. Using `requests` Library

Finally, if you need to parse the response of an HTTP request, you may use the requests library, as shown below:

import requests

if __name__ == '__main__':

url = "https://jsonplaceholder.typicode.com/todos/1"

obj = requests.get(url).json()

print(obj)

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That’s all about deserializing a JSON string into a Python object.

Deserialize a JSON string into a Python object

1. Using json Library

2. Using simplejson Library

3. Using ast module

4. Using requests Library

Share this:

1. Using `json` Library

2. Using `simplejson` Library

3. Using `ast` module

4. Using `requests` Library