json Overview

The json module provides tools for encoding and decoding JSON (JavaScript Object Notation) data.

What is JSON?

JSON is a lightweight data format for exchanging structured data.

import json

# JSON basics
json_str = '{"name": "Alice", "age": 30, "city": "NYC"}'
print(f"JSON string: {json_str}")

# Parse JSON
data = json.loads(json_str)
print(f"Parsed data: {data}")
print(f"Name: {data['name']}

JSON string: {"name": "Alice", "age": 30, "city": "NYC"}
Parsed data: {'name': 'Alice', 'age': 30, 'city': 'NYC'}
Name: Alice

JSON to Python Type Mapping

Understand how JSON types map to Python.

import json

json_str = '''
{
    "string": "hello",
    "number": 42,
    "float": 3.14,
    "bool": true,
    "null": null,
    "array": [1, 2, 3],
    "object": {"key": "value"}
}
'''

data = json.loads(json_str)
for key, value in data.items():
    print(f"{key}: {value} ({type(value).__name__)}")

string: hello (str)
number: 42 (int)
float: 3.14 (float)
bool: True (bool)
null: None (NoneType)
array: [1, 2, 3] (list)
object: {'key': 'value'} (dict)