Drag_Club

1. What is JSON?

• JSON (JavaScript Object Notation) is a lightweight format for exchanging data.
• Widely used in APIs, configuration files, and web services.
• Looks like a Python dictionary but uses a strict text format.

Example JSON data:

{
  "name": "Ali",
  "age": 25,
  "skills": ["Python", "JavaScript"]
}

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2. Working with JSON in Python

Python has a built-in json module.

import json

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3. Converting JSON to Python (Parsing)

import json

# JSON string
data = '{"name": "Ali", "age": 25, "skills": ["Python", "JavaScript"]}'

# Convert JSON → Python dict
person = json.loads(data)

print(person["name"])   # Output: Ali
print(person["skills"]) # Output: ['Python', 'JavaScript']

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4. Converting Python to JSON (Serialization)

import json

person = {
    "name": "Sara",
    "age": 30,
    "skills": ["Java", "C++"]
}

# Convert Python → JSON string
json_data = json.dumps(person, indent=4)
print(json_data)

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5. Reading and Writing JSON Files

Writing to a JSON file:

import json

person = {"name": "Kamal", "age": 28, "skills": ["Python", "SQL"]}

with open("person.json", "w") as f:
    json.dump(person, f, indent=4)

Reading from a JSON file:

with open("person.json", "r") as f:
    data = json.load(f)
    print(data["name"])

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6. Common Use Cases for JSON in Python

Use Case	Example
APIs	Fetching data from web APIs like weather or GitHub
Config Files	Storing user preferences and app settings
Data Exchange	Sending structured data between programs
Databases	Exporting and importing structured data

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7. Example: Working with API Data (GitHub)

import requests
import json

response = requests.get("https://api.github.com/users/octocat")
data = response.json()  # directly converts JSON → Python

print("Username:", data["login"])
print("Public Repos:", data["public_repos"])

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Summary

• JSON is a text format used for structured data.
• Use json.loads() to parse JSON strings → Python objects.
• Use json.dumps() to convert Python objects → JSON strings.
• Use json.load() and json.dump() for files.
• JSON is widely used in APIs, configs, and data exchange.

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