JSON

What is JSON?

JSON (JavaScript Object Notation) is a lightweight data format used to store and exchange data.

✅ It’s like a Python dictionary, but in string form.

Python and JSON

Python has a built-in module called json that allows you to work with JSON data.

➤ Import the module:

import json

✅ 1. Convert Python to JSON (Serialize)

➤ json.dumps()

Converts Python objects (like dict, list) → JSON string.

import json

data = {
    "name": "Alice",
    "age": 25,
    "is_student": False
}

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

🖨 Output:

{"name": "Alice", "age": 25, "is_student": false}

✅ 2. Convert JSON to Python (Deserialize)

➤ json.loads()

Converts JSON string → Python object.

import json

json_string = '{"name": "Bob", "age": 30, "is_student": true}'

data = json.loads(json_string)
print(data["name"])  # Output: Bob

✅ 3. Read from a JSON file

import json

with open('data.json', 'r') as file:
    data = json.load(file)
    print(data)

✅ 4. Write to a JSON file

import json

data = {
    "name": "Charlie",
    "city": "New York"
}

with open('data.json', 'w') as file:
    json.dump(data, file)

🔁 Summary Table

Function	Purpose
json.dumps()	Python → JSON string
json.loads()	JSON string → Python object
json.dump()	Write JSON to a file
json.load()	Read JSON from a file