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Python JSON

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JSON (JavaScript Object Notation) is a popular data format used for exchanging data between a client and server.

Python has a built-in package called json to work with JSON data.

🔹 Import the JSON Module

You must import the json module before using it.

import json

🔹 Convert Python to JSON (Serialization)

Use json.dumps() to convert Python objects into JSON strings.

import json

data = {"name": "Alice", "age": 25, "city": "Delhi"}

json_data = json.dumps(data)
print(json_data)

✅ Python dictionary is converted to a JSON string.

🔹 Convert JSON to Python (Deserialization)

Use json.loads() to convert a JSON string into a Python object.

import json

json_data = '{"name": "Alice", "age": 25, "city": "Delhi"}'
data = json.loads(json_data)

print(data["name"])  # Output: Alice

🔹 Write JSON to a File

Use json.dump() to write JSON data to a file.

with open("data.json", "w") as f:
    json.dump(data, f)

🔹 Read JSON from a File

Use json.load() to read JSON data from a file.

with open("data.json", "r") as f:
    content = json.load(f)
    print(content)

🔹 Supported Data Types

Python JSON
dict object
list, tuple array
str string
int, float number
True true
False false
None null

🔹 Format JSON Output

Make JSON readable using indent, sort_keys, and separators.

print(json.dumps(data, indent=4, sort_keys=True))

Practice Questions

Q1. Write a Python program to convert a Python list to JSON using json.dumps().

Q2. Write a Python program to convert a JSON string to a dictionary using json.loads() and access a specific value.

Q3. Write a Python program to write a Python dictionary to a .json file using json.dump().

Q4. Write a Python program to read and print content from a .json file using json.load().

Q5. Write a Python program to create a Python object with mixed data types (int, str, list, bool) and convert it to JSON.

Q6. Write a Python program to use sort_keys=True in json.dumps() and show sorted key output.

Q7. Write a Python program to add pretty formatting to JSON output using indent=2 in json.dumps().

Q8. Write a Python program to convert Python None to JSON using json.dumps() and verify the result (null in JSON).

Q9. Write a Python program to store user information (like name, age) in a .json file.

Q10. Write a Python program to read JSON content from a file and loop through all dictionary keys.

Python JSON Quiz

Q1: What does JSON stand for?

A. Java Source Object Notation
B. JavaScript Object Notation
C. Java Serial Output Network
D. None of the above

Q2: Which module is used for JSON in Python?

A. file
B. os
C. json
D. parse

Q3: What does json.dumps() do?

A. Deletes a JSON file
B. Converts JSON to Python
C. Converts Python to JSON string
D. Reads JSON from file

Q4: What is the function to convert JSON string to Python object?

A. json.stringify()
B. json.loads()
C. json.jsonify()
D. json.parse()

Q5: Which function writes JSON to a file?

A. json.read()
B. json.store()
C. json.dump()
D. json.output()

Q6: Which data type in Python becomes null in JSON?

A. 0
B. False
C. None
D. ''

Q7: Which argument is used to pretty-print JSON?

A. format=True
B. beautify
C. indent
D. newline

Q8: What is the output of json.dumps(True)?

A. true
B. "True"
C. TRUE
D. None

Q9: Which Python structure becomes a JSON array?

A. set
B. dict
C. list
D. None

Q10: What does json.load() do?

A. Loads a URL
B. Reads JSON from string
C. Reads JSON from file
D. Deletes a file
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